72 J. Scully — On a Collection of Mammals and [No. 1, 



with the points of the oval buccal and palatine. The following are the 

 principal measurements of the skull :— 



Inch. 



Total length, 1-58 



Breadth of zygomatic arch, 0*85 



„ of brain-case at posterior root of zygoma,.,. 0*69 



Length of palate to incisors, 0*69 



„ of nasals, 06 



Mandible, condyle to symphysis, 0*78 



Although the upper molars agree best with those of G. hurrianm, 

 this specimen is quite different in character and colour of fur and in 

 shape of skull ; neither can it be referred to G. erythrurus with which I 

 have compared it. It possibly represents a new species, but, as the 

 tail is imperfect, I do not propose a name for it. 



7. MUS BACTRIANUS, Blyth. 



1. cf Chahar Shamba, Maimanah, April 4. 



This specimen agrees fairly well with typical examples of M. hac^ 

 trianusj but the tail is shorter than the head and body, though this is not 

 of importance in a skin. In comparing this specimen, I have had occa- 

 sion to examine many specimens of M. pacJiycercus Blanford, from 

 Yarkand, and I may note that that species is quite distinct from M. bac- 

 trianus and has been happily named. 



8. Arvicola guenthebi, Danford and Alston. 



1. Afghan Turkestan. 



Head and body 4*4 inches, hind foot 0*77, ear at front 0'4<. The 

 external form and colours agree well with the original description of 

 the species from Asia Minor (P. Z. S. 1880, p. 62), except that in this 

 specimen the rudimentary thumb of the forefoot has a small nail. 

 The pattern of the molar teeth is very similar to that of A. guentheri, 

 with the following exceptions : — 



In this specimen — ^ has not the rudimentary 4th angle on the 

 inner side so prominent ; it is barely indicated. On ^^^-^ however, this 

 posterior inner angle is distinct and must be counted, although in the 



original description above cited it is omitted. -^—' has the posterior lobe 

 less prolonged backwards and tends less to form an angle on the out- 

 side than in the Asia Minor species, ^n too has the anterior lobe more 

 compressed laterally in the present specimen. The following table 

 exhibits the molar pattern according to the usual mode of counting :— 



