DEC 5 1930 ***i 



3f, o^ 



PAL^EONTOLOGICAL BULLETIN. /? /y £ / O x 



:n~0- 15. — — ' 



SECOND NOTICE OF EXTINCT VERTEBRATA FROM THE TER- 

 TIARY OF THE PLAINS. 



By Edward D. Cope. 



Bodentia. 



PALiEOLAGTJS AGAFETILLTJS, Sp. nOV. 



Molar teeth six ; the first of a single column, the others of two, antero- 

 posteriorly arranged, each surrounded by its distinct enamel sheath, with 

 a narrow intervening band of cementum. Posterior molar much reduced 

 in size ; posterior column of molars with a median posterior rib, which 

 forms a loop in section. Anterior column much more elevated than pos- 

 terior. The section of the slender incisor is nearly a right-angled spheri- 

 cal triangle. 



M. 



Length of molar series 0100 



" penultimate molar 0020 



Width " " 0020 



Depth jaw at " " 0065 



Diameter incisor 0015 



Size a little greater than that of the Sagomys princeps. 



CoiiOTAXIS CRISTATTJS, Sp. nOV. 



Order Rodentia, Char. Gen. Inferior molars 3 ; crown plicate, with 

 two connected cusps with crescentric section, on the outside, each of 

 which gives rise to two transverse crests, which are unconnected. Of 

 these crests the anterior and posterior are marginal and less developed 

 than the median pair. Intervals deep, without cement. 



Char, specif. Anterior molar narrower than the others, the cusps 

 partly alternating, the connecting crest of the exterior wall internally 

 placed, the transverse crests from the posterior forming a V. Anterior 

 cusps well separated. Enamel of all the molars smooth. 



M. 



Length of molar series No. 1 0110 



" penultimate molar 0037 



Width " " 0030 



Length of first " 0033 



Width " " 0025 



Second and third specimens display the incisor, whose outer anterior 

 faces form a regular convex. 



Hyracodon quadriplicates, sp. nov. 

 Represented by four superior molar teeth of one maxillary bone, and 

 two from the other, with several fragments. The transverse crests are 



