2o6 Biillcti)i American Museum of Natural History. [Vol. X, 



14. C. cuspidatus Cope. 



Type, Nat. Mus. Coll. Fragmentary inferior molars 2 and 3, and a portion 

 of the jaw. Originally distinguished by prominent entoconid 2. 



Colype, No. 276, Am. Mus. Coll. Complete lower dentition ; upper pm--m~. 

 This specimen was referred to C. obliqtius by Earle (1892, p. 162). 



Definition. — Inferior m.pm. = i54. Superior m.pm. = i50. Last superior 

 molar oval, antero-posteriorly compressed. Last inferior molar with oblique 

 hypolophid and more or less prominent entoconid 2. Metaconid with rudi- 

 mentary metastylid. Inferior incisors unequal in size. 



This is a diminutive Coryphodon, of the size and very similar 

 in molar type both to C. eoccenus Owen, from the London Clay, 

 and to C. 07venii Hebert, from the Suessonian of France. The 

 characters of Cope's type are very indefinite ; the complete upper 



and lower series of teeth, No. 276, 

 therefore serve as a cotype to define 

 this species, the most diminutive of 

 the series. The last lower molar of 

 the right side agrees in form and 

 measurement with Cope's type, al- 

 though the entoconid 2 is less promin- 

 ent and isolated ; on the left side the 

 entoconid 2 is nearly obsolete, again 

 demonstrating the variability of this 

 cusp. The very small lower canines 

 indicate that the animal is a female. 

 The enlarged second incisors and 

 general form of m3 confirm its reference to Series II. A unique 

 feature is the redujilication of the metaconid in m2 and m3 into 

 a rudimentary metastylid, parallel with the large metastylid of 

 Uiutat/ieriiim. Another example of this species is No. 4324. 



Fig. 24. Back view of pelvis of 

 Coryphodon lobatus. Am. Mus., 

 Cope Coll., No. 4335. 



13. C. latidens Cope. 



Type, Nat. Mus. Coll, ,'; . Lower jaws and teeth, left premaxillary and in- 

 cisors, superior canine. Loc, New Mexico. 



Definition. — Inferior m. and pm. = i56. Inferior molars short and broad 

 with crests nearly or directly transverse (angle=^ 85°) ; entoconid 2 vestigial or 

 wanting. Inferior incisors equal sized. Superior canines nearly straight, 

 antero-posteriorly compressed, subtriangular, with an external ridge. 



