. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Carpolestidae • Rose 31 seventh cusp variable in occurrence; tooth very similar to that of C. cygneus, differing in having less pronounced vertical ribs developed beneath apical cusps on lingual side, less developed posterior apical cusp (cusp just anterior to talonid heel), and, consequently, a deeper posterolingual de- pression than in C. cygneus; weakly ex- pressed posterointernal cingulum present, extending forward beyond midpoint of tooth. Weak internal cingulum at base of trigonid of Mi. Discussion: This species
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Carpolestidae • Rose 31 seventh cusp variable in occurrence; tooth very similar to that of C. cygneus, differing in having less pronounced vertical ribs developed beneath apical cusps on lingual side, less developed posterior apical cusp (cusp just anterior to talonid heel), and, consequently, a deeper posterolingual de- pression than in C. cygneus; weakly ex- pressed posterointernal cingulum present, extending forward beyond midpoint of tooth. Weak internal cingulum at base of trigonid of Mi. Discussion: This species is very close to the subsequently described species C. cygneus (L. S. Russell). Specimens now known reveal minor but apparently con- sistent differences between the two, and both are accordingly retained as valid taxa in this review. They are so similar, how- ever, that they must be very closely related, and it is not inconceivable that future evi- dence could provide justification for placing C. cygneus in synonymy. Although only four specimens are known (no upper teeth have been recovered) the entire lower dentition is represented. The type mandible preserves parts or all of the lower teeth. The enlarged incisor un- fortunately was damaged in preparation, but as restored it is a relatively longer and more slender tooth than in Elphidotarsius, much closer to the enlarged incisor of Carpolestes. This is the only incisor of Carpodaptes known, except for one isolated tooth from the Shotgun Local Fauna (UW 6530), possibly from Carpodaptes sp. (see Fig. 5B). Though only roots of the I2, C, and P3 remain, their crown shapes are clearly indicated by impressions in the matrix. All were diminutive, single-rooted, peglike teeth with bulbous crowns. P4, with its posterointernal depression, S-shaped crest, and talonid less distinctly separated from the main blade than in other species of Carpodaptes, bears a closer resemblance to P4 of Carpolestes than does P4 of any other species of C
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