1903] Matthetv, Fauna of Titanotheriiim Beds of Montana. 225 



dont molars like Lcptotragulus. No. 9681 (type) shows p,_mj; 

 No. 9682 (cotype) p^_3 and the root of m,; No. 9683 a num- 

 ber of lower molars and milk molars. Nearly all these teeth 

 are unworn or very little worn. 



The species is of about the same size as Lcptomeryx mam- 

 mifer, but is distinguished by the camelid pattern of the pre- 



Fig. 18. Leptotragulus i>ro/ectus. Type specimen, external view, 

 natural size ; second and third molars supplied from another individual. 



molars. The molars are very difficult to separate from those 

 of L. niammifer; they are a little wider and shorter-crowned, 

 with the crescents placed less obliquely, and m^ has but a 

 vestigial postero-internal cusp. The fourth premolar has no 

 deuterocone, but two strong posterior crests from protocone 

 to heel sub-parallel, enclosing a narrow lenticular fossa. The 

 third premolar is similar, but more compressed; the second 

 has but one complete posterior ridge. Their pattern differs 

 from that of Poebrotheriuni chiefly in the completeness of the 

 inner posterior ridge, which in Poebrotheriuni does not reach 

 the heel on P3 and p4_ and is entirely absent in pi. 



The cotype shows a moderate diastema, considerably 

 shorter than that of L. proavus, separating pj from the alve- 

 olus of a strong caniniform tooth. 



The heel of the last molar in referred specimens is like that 

 of Leptouieryx or Lepiotragnlus, with postero-external cres- 

 cent and small antero-internal cusp. In Poehrotherium is a 

 posterior crest, not crescentic, and a small antero-internal cusp. 



The species is about a fifth larger than L. proavus, with 

 which its premolar pattern corresponds quite closely, accord- 

 ing to Scott's description. The molars are a little wider and 

 [A/iri/, igoj.] 15 



