24 Annals of the Carnegie Museum. 



Order AMBLYPODA Cope. 



Family PANTOLAMBDID.E Cope. 



Pantolambda Cope. 



(Am. Nat., XVI, 1S82, p. 418. ) 

 (Plate II, figures 17, 18, and 19.) 



No. 1679, Carnegie Museum Catalogue of Vertebrate Fossils, is a 

 portion of a lower molar tooth. This and a complete tooth in the 

 Silberling collection probably represent a different species from either 

 Pantolambda bathmodon or P. cavarictis, as it is larger than the former, 

 and smaller and somewhat different in form from the latter. Probably 

 No. 1679 ^s the posterior portion of M^. Posterior and internal to 

 the postero-external crescent is a basin-shaped area, behind which, 

 forming the posterior angle of the tooth, is a subconical cusp which 

 terminates in a minute tubercle. Internal to the median portion of the 

 basin is another small tubercle. 



A complete tooth, in the Silberling collection, appears to be a 

 second lower molar. In this specimen the postero-internal basin has 

 an inner tubercle. 



mm. 



Length of molar 16. 



Width of anterior portion II. 5 



Incert.« Sedis. 



No. 1689 (Plate I, Fig. 11), Carnegie Museum Catalogue of Verte- 

 brate Fossils, is a minute one-rooted tooth. The upper portion of 

 the principal cusp is curved backward. On the posterior base of the 

 tooth there is a minute rudiment of a heel. It mav be either an in- 

 cisor or a premolar. 



No. 1687 (Plate I, Fig. 13) is a much larger tooth than the pre- 

 ceding and has a proportionally much larger heel which, however, 

 is low. 



No. 1690 (Plate I, Fig. 12) is a much larger, more robust tooth than 

 No. 1687 and the cusp is more perpendicular. There is a distinct 

 but not large heel and a minute antero-external (?) basal cusp. It 

 looks very much like the third lower premolar of Chriacus pelvidens 

 which is figured in Cope's Tertiary Vertebrata, Plate XIII, Fig. 8, 

 but it is much smaller. A cross-section of the tooth is subtriangular 

 and the postero-external face is concave. 



