This litigation crashes on the shoals of res judicata. Because the district court correctly apprehended this reality, we affirm its entry of judgment in the defendant’s favor.
I. BACKGROUND
The relevant facts are undisputed. Dr. Peter Boateng, a blade man from Ghana, began teaching accounting at the San Ger-mán campus of InterAmeriean University (the University) in 1988. Seven years later, the University denied him tenure but extended his probationary term as a professor for an additional year (during which time his candidacy was to be reevaluated). After unsuccessfully requesting reconsideration of the tenure denial, Boateng filed suit in the Puerto Rico Court of First Instance (Suit No. 1) on July 31, 1995. In his complaint, he invoked Puerto Rico law and alleged breach of contract and discrimination on the basis of race and nationality.
On March 16, 1996, Boateng amended his complaint to add an allegation that the University had retaliated against him by investigating charges that he had plagiarized some of his course materials. Following the completion of discovery and a six-day bench trial, the court entered a judgment in the University’s favor. See Boateng v. InterAmerican Univ., No. I PE95-0122 (P.R.Super.Mar. 30, 1998). Boateng’s efforts to undo the judgment — including a motion for reconsideration, an abortive appeal to the Puerto Rico Circuit Court of Appeals, and a petition for certiorari to the Puerto Rico Supreme Court — were uniformly unavailing.
Whilst prosecuting Suit No. 1, Boateng plied a parallel course. On January 19, 1996, after what Boateng apparently considered to be an unfavorable change of venue in Suit No. 1, he filed a second suit in the United States District Court for the District of Puerto Rico (Suit No. 2). The only relevant difference between the amended complaint in Suit No. 1 and the complaint in Suit No. 2 was that the latter included a statement of claim under Title VII, 42 U.S.C. §§ 2000e to e-17. 1 On April 8, 1996, the University moved for dismissal of Suit No. 2 or, in the alternative, a stay. It attached to its motion an English translation of the complaint in Suit No. 1. The district court denied this motion.
The University filed another motion to dismiss Suit No. 2 on May 6, 1998, this time arguing that the judgment in Suit No. *60 1 (a copy of which was attached to the motion) barred further proceedings. In response, Boateng asserted that the judgment was not final because, at that moment, the thirty-day appeal period (which he claimed had been tolled by the pen-dency of his motion for reconsideration) had not run. This rebuttal argument collapsed on June 30, when the Puerto Rico Circuit Court of Appeals dismissed as untimely Boateng’s appeal from the judgment entered in Suit No. 1.
Boateng’s fallback position was that his federal court case dealt with “matters different from those of the state court case (Title VII).” The district court rejected this argument and entered judgment in favor of the University.
See Boateng v. InterAmerican Univ.,
II. ANALYSIS
We review de novo orders granting summary judgment.
See Garside v. Osco Drug, Inc.,
A. Conversion.
Boateng posits that the court below effectively converted the University’s second motion to dismiss into a motion for summary judgment, expressly relying upon the complaint and judgment in Suit No. 1 in reaching its decision. He assigns error, contending that the court failed to furnish him advance notice and an opportunity to present opposing evidence before venturing outside the four corners of the pleadings in Suit No. 2. This contention derives from Fed.R.Civ.P. 12(b), which provides that:
If, on a [Rule 12(b)(6) ] motion ..., matters outside the pleading are presented to and not excluded by the court, the motion shall be treated as one for summary judgment and disposed of as provided in Rule 56, and all parties shall be given reasonable opportunity to present all material made pertinent to such a motion by Rule 56.
As a preliminary matter, we question whether this case actually involved conversion. After all, a court may look to matters of public record in deciding a Rule 12(b)(6) motion without converting the motion into one for summary judgment.
See Watterson v. Page,
Having raised this point, we conclude that we need not decide it definitively. The University has not challenged the fact of conversion, and we therefore assume, for argument’s sake, that the court converted the motion. On that assumption, we consider Boateng’s procedural argument.
We have interpreted Rule 12(b) as requiring some type of notice as a condition precedent to a court’s conversion of a motion to dismiss into one for summary judgment.
See, e.g., Collier v. City of Chicopee,
The documents on which the district court relied were famifiar to Boateng. The University submitted copies of those documents in the course of litigating Suit No. 2, and in all events, Boateng obviously possessed copies of both the complaint he himself had filed in Suit No. 1 and the judgment terminating that action. The motion to dismiss explicitly mentioned the complaint and the judgment, and rendered the court's reliance on those documents readily foreseeable., Furthermore, some seven months elapsed between the service of the University's second motion to dismiss and the district court's decision. During this interval, Boateng filed two responsive pleadings, one of which included a copy of a motion for reconsideration in Suit No. 1 (thus impliedly inviting the court to consider the record in that case). The short of it, then, is that Boateng was familiar with the proffered documents, had ample opportunity to respond to them, and, in fact, did so. By the same token, he had a full and fair chance to contest the accuracy of the proffered documents, but did not do so. 2
That ends the matter. No more was exigible to effect substantial compliance with the applicable notice requirement. See Collier,
B. Res Judicata.
We turn now to the res judicata issue. In determining the preclusive effect of a state court judgment in federal court-and Puerto Rico is, for this purpose, the functional equivalent of a state, see Cruz v. Melecio,
Puerto Rico courts do not interpret the phrase "perfect identity" literally. See Cruz,
In this instance, the commonwealth court, after considering Boateng's claims arising from the denial of tenure and the plagiarism investigation, expressly held that "the University fully complied with its contractual responsibilities towards ... Boateng" and that "the University did not discriminate against ... Boateng due to his race, color or nationality." Boateng v. InterAmerican Univ., No. I PE95-0122 (P.R.Super.Mar. 30, 1998). The court also specifically found that Boa-teng had committed plagiarism. See id. The present action derives from the same nucleus of operative facts, and a ruling in Boateng's favor obviously would contradict these earlier determinations. We conclude, therefore, that the requisite identity of "things" and "causes" is present.
Boateng espouses a contrary view, relying heavily on the fact that Suit No. 2 included a Title VII claim whereas Suit No. 1 did not. This reliance is mislaid. As a general matter, a difference in the legal theories asserted in two suits that arise from the same transaction (or set of transactions) does not undermine the identity of causes between them. See Kale v. Combined Ins. Co.,
To be sure, in Puerto Rico, res judicata operates to preclude only claims that were or could have been raised in a previous suit.
3
See Commonwealth v. Sociedad Civil Agricola e Industrial,
For one thing, Boateng did not advance this point in the lower court. It is, therefore, procedurally defaulted. "If any principle is settled in this circuit, it is that, absent the most extraordinary circumstances, legal theories not raised squarely in the lower court cannot be broached for the first time on appeal." Teamsters Union, Local No. 59 v. Superline Transp. Co.,
For another thing, on facts less defendant-friendly than those of this case, several courts have held Title VII claims to be precluded by a prior adjudication even though a right-to-sue letter had not been obtained until after final judgment had entered in the first action. See Heyliger v. State Univ. & Community College Sys.,
This conclusion seems particularly well justified because Boateng largely controlled the timing of the relevant events (for example, he could have sued a few months later). More than two years elapsed between his receipt of the right-to-sue letter and the entry of final judgment in Suit No. 1. During that interval, he could easily have amended his complaint in Suit No. 1 to include the Title VII claim: state courts have concurrent jurisdiction over Title VII claims, see Yellow Freight Sys., Inc. v. Donnelly,
Boateng also asserts that the corn-plaint in Suit No. 2 alleges acts of discrimination and retaliation that were not before the commonwealth court in Suit No. 1, thus dissipating the requisite identity of "things" and "causes." This assertion is baseless. We have compared the pertinent materials from the two cases. The sole act of retaliation properly pleaded in Suit No. 2 concerned the plagiarism irives-tigation-an allegation that was covered by Boateng's amended complaint in Suit No. 1 and discussed at length by the commonwealth court in its final judgment. See Boateng v. InterAmerican Univ., No. I PE95-0122 (P.R.Super.IV[ar. 30, 1998) (finding specifically that Boateng had committed plagiarism). Boateng may not have been obligated to bring the retaliation claim at the same time as his other claims, see Pleming v. Universal-Rundle Corp.,
We have one more bridge to cross. Noting that Puerto Rico courts ascribe preclusive effect only to judgments that are final and unappealable, see Cruz,
*64 III. CONCLUSION
To recapitulate: (1) the district court’s failure to provide explicit notice that it planned to convert the motion to dismiss to one for summary judgment, if error at all, was harmless under the circumstances because Boateng received the extrinsic materials relied upon by the district court, had ample opportunity to respond to them, and did not question their accuracy; and (2) the fact that the commonwealth court’s judgment in a suit involving identical parties, causes, and things is now final and unappealable confirms the district court’s founded conclusion that res judicata bars, the present action.
We need go no further. Boateng had a full bite of the apple — and the choice of the bite was his. He is not entitled to another nibble.
Affirmed.
Notes
. Boateng failed to obtain tenure at the end of the 1995-96 probationary period. His employment with the University was terminated on July 31, 1997 (when a final, nonrenewable one-year contract expired). He thereafter attempted to amend his complaint in Suit No. 2 to include allegations of discrimination in respect to these events. The district court denied the motion. On appeal, Boateng does not assign error to that ruling.
. In his brief, Boateng hints that, had he been given explicit notice of the court's intent to convert the motion, he would have submitted additional evidence in support of his position on the res judicata defense. When pressed at oral argument to elaborate on that possibility, however, Boateng's counsel was unable to identify any such evidence.
. The same rule obtains in other jurisdictions that follow the transactional approach. See, e.g., Massachusetts Sch. of Law at Andover, Inc. v. American Bar Ass'n,
