244 WASATCH FAUNA. 



occupy a small part of the crown. The last molar is lost from both jaws, 

 but the space for it is about as lar^^e as that occupied by the penultimate. 

 The fourth premolar has but two anterior cusps, and these are more elevated 

 than those of the true molars, and the heel is narrower. The, mandibular 

 rami are not coossified. 



The dental characters of this genus resemble considerably those of 

 Anaptomorphus and Necrolemur, but .the large size of the inferior canine 

 or incisor tooth distinguishes it from both. The double anterior cusps of 

 the fourth premolar equally distinguish it from them. 



Cynodontomys latidens Cope. 



Proceed. Araer. Philos. Soc, 1881, p. 151 (1882). 

 Plale XXIVe, fig_2. 



This species is known from a pair of mandibular rami which are bound 

 together by matrix. 



Th^ infei-ior true molars are subquadrate in horizontal outline, some- 

 what narrowed anteriorly. The concave heel is the larger part of the 

 crown; it is only elevated into a low cusp at the posterior external angle. 

 The anterior cusps are conic, and are in contact at the base. The external 

 and posterior internal are of about the same size; the anterior inner is 

 smaller and does not project so far inwards as the posterior. The fourth 

 premolar has the posterior border of its heel serrate. The anterior cusps 

 are elevated and moderately acute; the internal is a little less elevated than 

 the external, and is separated from it by a deep notch. The alveoli for the 

 anterior premolar are not so close together as to render it probable that they 

 belong to but one tooth. They are placed somewhat obliquely to the long 

 axis of the jaw. There is no diastema. The section of the base of the 

 crown of the canine is a regular oval, the long diameter coinciding with 

 the vertical diameter of the ramus 



The ramus is rather slender, but is shortened anteriorly. The bound- 

 aries of the masseteric fossa are well marked, the anterior ridge descending 

 to below the n)iddle line of the ramus. The mental foramen is large, and 

 is situated below the contact of the two premolars. Tlie inferior edge of 

 the ramus is rather thick. 



