CASTOKII)^— STENBOFIBKIf-S. PANSU8. 



453 



Tlic iiioa«Hrcinrnls given Itj- Dr. Le'uly of Pulaocmlor ncbinscfnsi.t show 

 it fc) hnvo Ihjcii of about the size of Eucaxtor tortus, or nitlier smaller, Itiit 

 Komcwhnt «liflprrnt from it in the relative size of the tcclh, in tiie width of 

 the jmlntc, and in the general form of the skull. 



STENEOFIBER PANSUS Cope. 



Slauojthtr ptn>n$ Cope, Proc. AcwI. Nat. Hci. Pliiln., 1874, HH; Ann. Rap. Wlicoler's E\J>\. wait of lOOtb 

 Ucrid., l-fTu, 73. 



Of tins species, recently described l)y Professor Cope, from the Santn 

 F6 marls, little is known. It is apparently closely allied to the S. nehrascensin 

 of Leidy. Professor Cope's description is as follows: "The molor tcclh 

 exhibit a regular gnid.ition in width from the large anterior to the small pos- 

 terior. In the mandibular series, the second and third are broader than long, 

 the first an<l fourth longer than broad, and with an angle of the outer anterior 

 side of thi' crown. There is an inflection or groove of the enamel on both 

 inner and outer sides of the crown, an<l an enamel area before and one behind 

 them, on all excepting the last molar, where there are two in froiit. First 

 nearly twice as large a.s la-st molar. Lower incisor with smooth enamel, and 

 angulate on the extero-antcrior border. Ilamus stout. Length of the molar 

 series, 0".016 ; length of first molar, O^.OOS ; width of first molar, 0'".004 ; 

 width of last molar, 0".003.5 ; transverse diameter of incisor, 0'".004 ; depth 

 of ramus at 2".012. 



"The regular diminution of the size of the teeth from front to rear is 

 characteristic of this species; according to Dr. Leidy, their reduction in size 

 in the S. nebrascensU is more abrupt. The latter species is said to be of 

 Miocene age." 



