190 1.] Matthew, Additional Observations on the Creodonia. 29 



fragments not well preserved, which either is a very large indi- 

 vidual of this species or represents a distinct species undescribed. 



Anterior premolars spaced ; p- without distinct accessory cusps ; p^ with 

 main cusp conical-lenticular ; internal cusp conical, postero- external cusp not 

 extended into a shearing blade. Outline of m^ and m^ obtuse-angled triangles, 

 metastyle especially extended on m^ pa. and ine. but little connate ; m^ with 

 small metacone, transverse diameter greater than that of m^. M^ with well- 

 developed heel ; m^f in type with much reduced metaconid, advanced paraconid 

 forming a shearing blade more nearly anteroposterior than in any other Siiiopa, 

 and narrow heel. In No. loi mg is normal in character, with more transverse 

 shear and larger heel. 



The depth of the jaw is moderate in the type ; in No. loi it is 

 excessive, although the wear of the teeth does not indicate a 

 much older animal. Both have the same rounded cusps, com- 

 paratively slight approximation oi pa. and me., simple p-, wide va-, 

 extended blades on mJ---^ and other characters, so that if distinct 

 the two are evidently closely allied. 



Measurements. 



Length c^— m^ 

 mi-^ 



Diameters of p -, anteroposterior 



No. 99 No. loi 



transverse 

 anteroposterior 

 transverse 

 anteroposterior 

 transverse 

 anteroposterior 

 transverse 

 Length P3-4 anteroposterior 



-I 



" heel of mg 

 Width " " " 

 Depth of jaw at mg 



