CORYPHODON. 533 



is rather short. The crown of the incisor is regularly convex externally, 

 and is not expanded at the base. There is a strong internal cingulum. 



A fragment of the lower jaw supports the last two molars. The 

 internal angle of the last one is unfortunately broken. The postei'ior crest 

 is, however, perfectly transverse, which is not the case with the species 

 with three posterior tubercles. The preserved part of the posterior border 

 shows a distinct, rather narrow heel. The anterior Vs are well developed, 

 and there ai'e no lateral cingula. The symphysis is flattened out by pres- 

 sure. The inferior canine is large. It is sub-triangular at base and has an 

 anterior basal angular projection. 



Measurements. 



M. 



_. , „ ,,...( transverse 016 



Diameters of sui^erior M. lu ^ 



( longitudinal 067 



_ . , J. • nT ■ ^ transverse 036 



Diameters of superior M. 1 ^ , . ,. , .,. 



c longitudinal OSa 



T^. . „ ■ o< vertical 018 



Diameters crown i. 2 < „, „ 



( transverse 018 



( transverse 0^8 



Diameters inferior M. iii < anteroposterior 040 



( vertical in front (restored) 024 



Length of symphysis - 107 



Depth of ramus at M. iii 056 



The superior molars of this species might readily be taken for an un- 

 dersized individual of C. anax, but the last inferior molar is of a different 

 type, and refers the species to a different section of the genus. 



The Big-Horn Basin; J. L. "Wortman. 



CORYPHODON CUEVICRISTIS Cope. 

 Paleontological Bulletin No. 34, p. 172, Feb., 1882. Proceed. Amer. Philos. Soc, 1881, Dec. 172, (1882). 



Plate XLIVc. 



The fragments which represent this species belong to one individual. 

 They include a considerable part of both mandibular rami with numerous 

 molar teeth, and most of the inferior incisors loose. Also the second supe- 

 rior molar, some superior premolars, the canine, and three or four incisors, 



