the Marsh Collection, etc. 443 



Measurements of Hololypes. 



A. taxoides A. magnus A. wheelerianus 



mm. mm. mm. 



Length of inf. premolar series .... 62 63 46 



Length of inf. molar series 53 53 49 



Ant.-post. diameter of sectorial .... 34 32 28 



Ant.-post. diameter of P 4 22 21 15 



Ant.-post. diameter of M 2 12 14.5 12 



Ant.-post. diameter of M 3 8 9 6 



Depth of ramus below P 4 37 36 29.5 



Length of sup. dental series, C-M 2 



inc 113 



Length of sup. premolar series .... 74 



Length of sup. molar series 24 



Ant.-post. diameter of carnassial . . 27.3 



MuSTELIDiE. 



Brachypsalis pachycephalia Cope. 



This genus and species is represented by the posterior 

 part of a right ramus, except the coronoid process, pos- 

 sessing Mj and M 2 , somewhat damaged. It is Cat. No. 

 12780, Y. P. M., and it was collected near the mouth of 

 Minnechaduza Creek on the Niobrara River, Nebraska. 

 It is somewhat more slender than the type, in this respect 

 approaching B. modicus Matthew, although in other 

 essentials it is identifiable with Cope's species, represent- 

 ing a possible variety of the latter form. 



Another specimen, a right ramus, Cat. No. 12803, 

 Y. P. M., is more typical than No. 12780. Professor B. F. 

 Mudge collected the jaw near Ellis, Kansas, in the 

 Ogalalla formation, which is not later in age than Low T er 

 Pliocene and may well be of late Upper Miocene. This 

 ramus shows characters intermediate between that of 

 B. modicus and B. obliquidens Sinclair, although its mod- 

 ifications are much less extreme than those shown by 

 Sinclair's species. The length of the tooth-row and of 

 the individual teeth is a little greater than in the type 

 of the genus. 



