. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Oligocene Rodents of Bolivia • Patterson and Wood 387. Figure 5. Cheek teeth of Sallamys pascuali, Protacaremys prior, and Prospaniomys priscus. H., x5; others, xio. A-B. Sallamys pascuali, PL) no. 20982, LM'. A. Occlusal view. Dotted area is matrix. B. Anterior view, showing unilateral hypsodonty. C. S. pascuali, PL) no. 20907, RP4-M2. D. S. pascuali, PL) no. 20909, Rdm4-M2. Unerupted Mj with no enampi cap or, at most, an incomplete one. Grooves are in dentine. E. S. pascuali, PU no. 21727, RNVa- F- Protacaremys prio
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Oligocene Rodents of Bolivia • Patterson and Wood 387. Figure 5. Cheek teeth of Sallamys pascuali, Protacaremys prior, and Prospaniomys priscus. H., x5; others, xio. A-B. Sallamys pascuali, PL) no. 20982, LM'. A. Occlusal view. Dotted area is matrix. B. Anterior view, showing unilateral hypsodonty. C. S. pascuali, PL) no. 20907, RP4-M2. D. S. pascuali, PL) no. 20909, Rdm4-M2. Unerupted Mj with no enampi cap or, at most, an incomplete one. Grooves are in dentine. E. S. pascuali, PU no. 21727, RNVa- F- Protacaremys prior, FMNH no. P 13295, RM,. G. Protacaremys prior, AMNH no. 29707, Rdm^-M^. H. Prospaniomys priscus, AMNH no. 29697, Ldm^-Mj. There are only four crests, with not the slightest suggestion of a fifth. The third (the metaloph) is finnly attached to the posteroloph and isolated from the hypo- cone, although there is a crestlet from the hypocone, running posteriorly across the mesoflexus, at right angles to the direc- tion of what Lavocat (1976: 30) described as a rudimentary mesoloph. The tooth is supported by three roots, two buccal and one lingual. The lingual side of the tooth has about twice the height of the buccal. The last two upper molars are not rep- resented in the Princeton collection. The published figures and description show that the third loph, the metaloph, has the usual attachment to the mure, and, sur- prisingly, that the hypoflexus of M^ was converted by wear to a hypofossette ear- lier than on M^ Evidently there was in- dividual variation in depth of flexus as well as in angle of wear. The last upper molar, as figured by Lavocat (1976: PI. 1, Fig. 5) seems to us to have a structure completely homolo- gous to that of the anterior molars, with a complete metaloph followed by a com- plete posteroloph. The latter bends to- ward, but does not reach, the metaloph. This identity of structure among the mo- lars seems to us clearly to demonstrate the accuracy of our int
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