206 Mr. 0. Thomas— il revised 



slaty basally. Hands and feet buffy white. Tail apparently 

 longer than in brant sii, though satisfactory measurements 

 are not available ; well haired, dark buffy above, paler 

 below, a variable portion of the upper side of the end of 

 the tail brown or blackish, but this is sometimes scarcely 

 perceptible. 



Skull and teeth as indicated in the synopsis and subgeneric 

 diagnoses above. 



Dimensions of the type : — 



Head and body 157 mm. ; tail 97 ; hind foot 26. 



Skull : greatest length 376 ; condylo-incisive length 36 ; 

 zygomatic breadth 20; nasals 12'8x4*2; interorbital 

 breadth 6 ; meatal breadth 21'5 ; palatilar length 17 ; 

 palatal foramina 7; bulla? 12'3x8; upper molar series 

 (crowns) 7'2. 



Hub. Bushmanlaud. Type from Turn, Kenhart. 



Type. Old male. B.M. no. 12.4.25.9. Original num- 

 ber 7. Collected 16th July, 1911, by Maj. H. A. P. Little- 

 dale. Five specimens. 



The specimens of this remarkable animal were placed with 

 the collection of Otomys brantsii without examination of the 

 skulls, which were cleaned and put away later. Now, how- 

 ever, study of the skulls shows that Major Littledale's 

 animal is wholly different, and represents a really interesting 

 discovery. 



2. Myotomys *, gen. nov. 



Genotype. M. unisulcatus (Otomys unisulcatus, Bts.). 



Skull with more indication of an approach to that of 

 Otomys. But the muzzle is not modified in the peculiar 

 way characteristic of that genus, the nasals being but little 

 broadened anteriorly, so that the premaxillse are always 

 clearly visible from above outside them. Interorbital region 

 not specially contracted ; its edges with distinct beads, which 

 evenly diverge backwards instead of abruptly curving out- 

 wards to form postorbital projections, as is the case in 

 Otomys. These beads scarcely run any distance on to the 

 parietals. Other skull-characters much as in Otomys. 



Teeth not very highly specialized. Upper incisors gene- 

 rally with one narrow groove, which is, however, occasionally 

 obsolescent. Lower incisors not or very faintly grooved. 

 Third upper molar not greatly laminated, the usual condition 

 being three complete lamina? and a posterior trefoil, which 



* /ii)s-f- Otomys. 



