SOREX 



79 



lying between the large central upper incisors and the last pre- 

 molar are somewhat obscure, since the premaxillo-maxillary 

 suture disappears very early in life. If Brandt be correct in 

 his assertion (see Bull. Soc. Imp. des Nats, de Moscou, xli., iii., 

 76-95, 1868; xliii., ii., 1-40, 1871 ; Dobson, Proc. ZooL Soc. 

 (London), 1890, 49-51) that in the type of the genus this 

 suture lies between the fourth and fifth teeth, then the first 



0) 



"/ 



Fig. 23.— Mandibular Articulation of Sorkina. (Drawn by M. C. A. Hinton.) 



Inner view of posterior part of left ramus of (l) Sorex araneus, and (2) Neomysfodiens. In (3) and 

 (4) the respective condyles are shown in posterior view, much enlarged, s and i being the 

 superior and inferior articulating surfaces. 



four must be reckoned as incisors — a number unique amongst 

 the higher mammals. On this notation the fifth tooth is a 

 canine ; then follow two premolars, the first minute, the second 

 large, and three molars ; but it is simpler to style all between 

 the central incisors and the molariform teeth as unicuspids. 

 The notation of the lower teeth is that of Dobson, and is based 

 on his having found a minute seventh tooth, thought to be a 



