Peterson : Miocene Beds of Nebraska and Wyoming. 55 



tal canal is on a line horizontal with the grinding surfaces of the teeth. 

 The base of the coronoid process is heavy, the masseteric fossa is deep, 

 and there are two mental foramina, one below P^ an d the other 

 below P^. 



The inferior incisors of the type are not preserved. The inferior 

 canine is as heavy as the superior: it is strongly recurved, is somewhat 

 grooved internally, has a light cingulum, and is covered with smooth 

 enamel. There is a short diastema between the canine and P T ; other- 

 wise the teeth are set quite close together throughout. P T has a simple 

 crown with the protoconid shifted well forward. P^ and P^ have 

 slight posterior marginal lobes and very minute anterior basal tuber- 



2 



Fig. 15. Dentition of Nothocyon annectens Peterson. I. Superior dentition. 

 2. Inferior dentition. Type, Nat. size. 



cles. P T is a larger tooth, and besides the posterior marginal lobe 

 and anterior basal tubercle there is a well defined posterior accessory 

 cusp. P^, P3-, and P ¥ have rounded and small cingula. , The carnas- 

 sial tooth is very robust ; its heel is broad and the external tubercle is 

 somewhat larger than the internal. The anterio/ tubercles of M T are 

 closely connected and the posterior tubercle/; are low and small ; 

 there is a heavy anterior cingulum. M^ is rar/ner small. 



Measurements. 



mm. 



Length of upper dentition 38 



Length of upper premolar series 21 



Length of the molar series 10 



Antero-posterior diameter of upper carnassial io 



Transverse diameter of upper carnassial, anteriorly 5 



Antero-posterior diameter of M 1 - 7 



Transverse diameter of M^ 8.7 



