1903.] Matihnc, Fauna of Titanot/ierium Beds of Montana. 209 



the first molar shows a sharp antero-internal angle and small 



antero-internal cusp. It is not very close to Schlosser's type, 



and if, as Scott believes, Pseudopterodon is 



founded on milk teeth of Hycenodon, then 



our species represents an undescribed genus, 



which may well stand ancestral to Hycenodon, 



being directly intermediate between that Fig. e. Pseudopte- 



genus and SmOpa. view of upper teeth, 



. 1-1 -11 natural size. No. 9623. 



ihe animal was a little smaller than 

 CynohycBuodon cayluxi Filhol. P3 is two-rooted, slightly 

 compressed, set a little transversely in the jaw, moderately 

 high, with small anterior basal cusp and heel. P^ is three- 

 rooted, the internal root well separated, median, supporting 

 a strong internal buttress to the protocone and a basal 

 cingulum, but no defined cusp. The antero-external cusp is 

 of moderate size, the postero-external developed into a short 

 cutting blade. M^ is three-rooted, the inner root anterior 

 and well separated, bearing a wide buttress ridge and a small 

 internal cusp, which is worn off in the specimen. Only the 

 front part of the tooth is preserved. M^ was larger than m' 

 and similar to it, judging from the character and position 

 of the two anterior alveoli which indicate it on the specimen. 

 f HycB)iodont, indet. 



An upper premolar of singular character which I am unable 

 to refer to any described species of Carnivore or Creodont. It 

 has two roots, the posterior one broadened inwardly so as to 

 support a median internal buttress to the protocone. The pro- 

 tocone is very high, its height exceeding the antero-posterior 

 length of the tooth; somewhat compressed posteriorly, with 

 a well-distinguished posterior cusp and small posterior cin- 

 gular cusp. Cingulum obsolete except at anterior and pos- 

 terior ends of tooth. Appears to be the third or, perhaps, 

 second upper premolar of some Hysenodont, but not of Hycs- 

 nodon or Pterodon. 



CARNIVORA (Fissipedia). 

 Cynodictis paterculus, spec, no v. 

 Two lower jaws and parts of others, Nos. 9616, 9619, repre- 



[April, i<poj.] U 



