106 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.58. 



NEOTOMA MAGISTER Baird. 



In the Cavetown collection are found a part of the left premaxilla 

 (Cat. No. 9205) inclosing a part of the corresponding incisor; also 

 a left lower incisor (Cat. No. 9206). The latter has been identified 

 by Dr. E. A. Goldman as belonging to N. pennsylvanica. The upper 

 incisor appears to differ in no way from the corresponding tooth of 

 Baird's types of ^V. magister, being fully as broad ; but some speci- 

 mens of N. pennsylvanica are hardly, if at all, distinguishable. On 

 the whole, the writer prefers to refer these fossil teeth to Baird's 

 species. 



MICROTUS PENNSYLVANICUS (Ord). 



Of this species there is a part of a skull in a fragment of red earth 

 (Cat. No. 9207). It has been possible to expose an upper incisor and 

 a part of the lower jaw showing its incisor. The remains appear to 

 belong here. 



Family ERETHIZONTIDAE. 



ERETHIZON DORSATUM (Linnaeus). 



Of this species there is the left ramus of the mandible (Cat. No. 

 9208) , only the condylar and most of the coronoid processes being gone. 

 The teeth are in fine condition. The specimen is of interest because the 

 premolar is just making its appearance through the bone. The 

 leAgth of the row of molars is 19 mm. The incisor measures 5 mm. 

 in diameter, somewhat more than in any of the skulls at hand of 

 recent individuals. However, there appears to be no sufficient reason 

 for thinking that it belongs to another species. 



Family LEPORIDAE. 



SYLVILAGUS FLORIDANUS (Allen). 



This rabbit appears to be represented by a part of a left maxilla 

 (Cat. No. 9209), in which are found the first molar, the two premo- 

 lars, and the socket for the first premolar. After a close comparison 

 with skulls of a number of species in the United States National 

 Museum there appears to be no good reason for not identifying the 

 jaw as that of the existing species Sylvilagus -fioridanus. 



Family URSIDAE. 



URSUS AMERICANUS Pallas. 



In the Cavetown collection there are a nearly complete right ramus 

 of the lower jaw, with the four chewing teeth; a fragment of a canine ; 

 a part of the right maxilla, with the bases of the crowns of the 

 fourth premolar and the two molars; another fragment of right 

 maxilla with sockets for the canine, for two premolars and first 



