270 Mr. R. C. Wroughton oa 



bullae, and from unisulcatus Granti in additioa it differs by 

 its larger size. 



The modification of mj shows a close approximation to the 

 spiral pattern even in the younger specimens, m^ is quite 

 as in unisulcatus. 



Mr. Thomas described this form as a distinct species, but 

 I do not think it should rank as more than a subspecies ot 

 unisulcatus , to which it is quite as closely related as Granti. 



(5) Otomys unisulcatus Granti. 



Otomys unisulcatus Ch-antif Thos. Ann. & Mag. Nat. Hist. vol. x. p. 312 

 (1902). 



97. 11.5.22. Fish River (Graharastown Museum, C.C). 



1. 7. 9. 30. Deelfontein, C.C. {E. Seimund). 



2.9.1.48-59,95; 3.1.4.38-41; 3.3.6.9. Deelfontein 

 [Col. Sloggett). 



The type is a very old male ; more normal dimensions 

 than those given by ^Ir. Thomas are as follows : — 



Head and body 105 mm. ; tail 100; hind foot 25 ; ear 22. 



Skull : greatest length 37 ; basilar length 30 ; zygomatic 

 breadth 19; length of upper molar series 8; bullae 7*5. 



The only well-marked character distinguishing this local 

 race from true unisulcatus is the obsolescence of the grooves 

 on the upper incisors, and therefore the Fish-River specimen 

 must be placed here. 



The modification of the anterior portion of the first lower 

 molar in the younger specimens shows the " kidney " pattern, 

 but in older specimens it seems to approximate to the spiral 

 pattern owing to wear. The third upper molar is quite as in 

 unisulcatus — i. e. is composed of three distinct laminae and a 

 posterior portion in the form of a trefoil. 



(G) Otomys Sloggetti. 

 Otomys Sloffetti, Thos. Ann. & Mag. Nat. Hist. vol. x. p. 311 0!X)2). 



3 3 G ^0~^^' l^eelfoutein {Col. Sloggett). 



The following are normal dimensions for this Mcll-marked 

 species : — 



Head and body 135 mm. ; tail 05 ; hind foot :2:2 ■ car 19. 



Skull : greatest length 35 ; basilar length 28 ; zygomatic 

 breadth 18; length of upper molar scries 7'5 ; bullae 8. 



This species, though evidently very closely related to 

 unisulcatus, is easily ditfercntiatcd by its small size, short 



