I go I.] Matthew, Additional Observatiofis on the Creodonta. 27 



Nos. 97 and 98, from the Big Horn Valley, Wyoming, Am. Mus. 

 Coll. 1891. All fragments of lower jaws. 



It is quite impossible to separate this species from S. ivhitia on 

 our present knowledge, but when more complete material is found 

 it will probably show some distinctions. In particular I should 

 expect to find the metaconid present on m^, as it is on all known 

 Wasatch and no known Wind River species of the genus. I 

 therefore hold the species separate provisionally and refer the 

 Wasatch specimens to 6". strenua. The characters are : size 

 medium, mj smaller than m^, shear of trigonids 55°-6o° from 

 transverse ; p^ with small internal and somewhat larger postero- 

 external cusp ; teeth compressed with angulate cusps. 



A somewhat smaller variety or distinct species has m^ less 

 reduced and shear more transverse. It may prove to be S. 

 multicuspis. (Am. Mus. Nos. 2815, 4220, 96, and 4218, Wasatch 

 assise, Wyoming.) 



Sinopa multicuspis {Cope). 



Prototomus multicuspis CoPE, Syst. Cat. Eoc. Vert. N. M., Rep. Wheeler 

 Survey, 1874 (1875). 



Stypolophus, Ext. Vert. N. M., Final Rep. Wheeler Survey, IV, ii, p. 116. 

 Tertiary Vertebrata, p. 290. 



Wasatch assise, New Mexico. The type is an upper jaw, 

 separable by the much reduced m-^- (if this tooth be complete). 

 The co-type is a piece of a lower jaw, with which the small 

 specimens referred to above most nearly agree. 



[Sinopa secundaria {Cope)^ 



Prototomus secundarius Cope, Syst. Cat. Eoc. Vert. N. M., Rep. Wheeler 

 Survey, 1874 (1875), P- 9- 



{Stypolophus), Ext. Vert. New Mex., Final Rep. Wheeler Survey, IV, ii, 115. 



Wasatch assise, New Mexico. All the characters given in the 

 descriptions are common to the genus. The specimen has 

 not been figured. The measurements hardly separate it from S. 

 multicuspis. 



Sinopa viverrina {Cope). 



Prototomus viverrinusQ.OV^, Rep. Foss. Vert. N. Mex., Rep. Wheeler Survey, 

 1874, 13(125); Syst. Cat. Eoc. Vert. N. M., Rep. Wheeler Survey, 1874(1875), 9. 



(Stypolophus), Ext. Vert. New Mex., Final Rep. Wheeler Survey, IV, ii, 

 (1877), p. 112, pi. xxxviii, figs, i-ii ; Tertiary Vertebrata, p. 290. 



