2o8 Bulletin American Museum of Natural History. [Vol. X, 



and in the rather broad proportions of the molars, but exceeds 

 this species in size. The complete superior canine determines 

 the position of the animal in Series II. The canine is powerful, 

 curved and antero-posteriorly compressed, partly as the result of 

 pressure. The inferior premolars are exceptionally short. 



A fourth member of this series, C. veniainis^ is found in the 

 Wind River Beds. It appears to resemble C. latidcns in the form 

 of the superior canines. 



Scries III. — Smaller Corvphodons. Specialized. Rela- 

 tively NARROW, FLAT-TOPPED SkULLS, (?) WITHOUT PaRIETAL 



Horn Rudiments. Canines compressed laterally and 



GROOVED anteriorly. LoWER MoLARS ELONGATE, CrESTS 

 NEARLY OR QUITE TRANSVERSE ; M3 P.ILOP.ATK, NO EnTO- 

 CONID 2. 



In 1872 Cope defined certain teeth as Afctalophodon arniafus, 

 mistaking the posterior superior molars, m^, of two individuals 

 for m- and m- of one individual, as can be proved by a compari- 

 son with his type of C. molestus. The latter type moreover gives 

 us the cranial characters and constitutes a valuable cotype. 



6. C. (Metalophodon) armatus. 



y'l'/t', No. 4315, Am. Mus., Cope Coll. Superior m=', m^, premolars, supe- 

 rior canine and incisors ; two individuals, probably mingled, fully adult. 



Cotype, No. 4316, Am. Mus., Cope Coll. Superior m^ and m'', m.,, pre- 

 molars, etc., juvenile. 



Definition. — Upper and lower canines greatly compressed, with a deep 

 antero-internal groove upon the upper canine. M^' with powerful anterior crest, 

 mTf without entoconid 2. Lower molars elongate, crests lunate, nearly trans- 

 verse. (Angle with long axis of jaw, 81'^.) 



Synotiynis. 



9. C. .UDiux Cope. Type, U. S. Nat. Mus. Coll. Inferior m and pm = i54. 

 Fragmentary skull, probably female. Superior canine. Mandibular rami and 

 teeth. Log., New Mexico. 



