SYNOPSIS OF THE VEUTKBKATK FAUNA OF TUK TUERCO SERIES. 337 



Species with Inferior Molars only. 



I. Size large ; premoUrs unknown. 



Inferior true molars .0285 ; depth ramus at m. i .015 C. riielimei/eranus. 



II. Size smaller ; premolars not spaced. 



Inferior true molars .023, last large ; ramus .018 C. pelcidens. 



Inferior true molars .017, the last small, the first not reduced ; ramus .011 C schlosserianus. 



III. Size smaller ; spaces between p. ms. ii, iii and iv. 



True molars .018, fifth cusp very distinct from fourth ; molar series .043 C. baldwini. 



True molars .024, fifth cusp divergent, connected with fourth by a crest : molar series .0.50 O. stenops. 



IV. Smaller ; third premolar larger than second. 



Depth of ramus at p. m. i .010 C. inversus. 



_ ^ CD «» \^ - 



Fig. 9. ' 



Fig. 10. 

 Fig. 9. Chriams truncatus f natural size. Fig. 10. Indrodon malaris J natural size. 



CnniACus priscus sp. nov. Fig. fi. 



This species is represented primarily b}' a fragmentary skull of wliicli there 

 remain, the superior walls of the brain case, a part of the left maxillary bone, Avhich 

 supports the postei-ior five molars ; part of the right maxillary with three molars, and 

 part of the right mandibular ramus with the anterior two true molars. There are asso- 

 ciated as cospecific with this individual, a second, represented by superior and inferior 

 molars ; a third represented by superior molars onljs and two others represented 

 by mandibular rami only ; in all, five individuals. All are from the lowest beds of 

 the Puerco. 



The superior molars are of the same size as those of the O. pelvidens, but are 

 very dilferent in form. The absence of the stiong internal angles of the crown at 

 the inner extremities of the anterior and jjosterior cingiila, is one character. The 

 straight outline with an open margination of the external side of the crown in C. jx'l- 

 videns is in strong contrast with the two convexities, each following an external cusp 

 which form the outline in the C. jfrif^cus. The first premolar has a small internal cusp 

 in the C. priscus ; a large one in the C. pelvidens. It is represented by an angular 

 cinguliiin in the C. priscus. In this species the cinguliim does not extend round the 

 inner base of the crown, except weakly in the last molar. 



The inferior molars have a relatively greater transverse diameter than those of 

 any other s])ecies of the genus. They also differ from those of the (J. pelvidens and 

 C. stenops., which they resemble in size, in the nearly equal elevation of the anterior 

 and posterior cusps, and in the absence of an external basal cingiiluni. The lift h 



