20G Mr. O. Thomas — A revised 



slaty basally. Hands aud feet biiffy white. Tail apparently 

 lonj^er than in brantsii, though satisfactory measurements 

 are not available ; well haired, dark butfy 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 aud subgeneric 

 diagnoses above. 



Dimensions of the type : — 



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



Skull : greatest length 37'6 ; condylo-incisive length 36 ; 

 zygomatic breadth 20 ; nasals 12"8 x 4*2 ; interorbital 

 breadth 6 ; meatal breadth 2T5 ; palatilar length 17 ; 

 palatal foramina 7; bullae 12'3x8; upper molar series 

 (crowns) 7'2. 



Hab. Bushmanland. Type from Tuin, Kenliart. 



Type. OU moXe. B.]\f. 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 

 tlie collection of Otomys bj'antsii 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 diflferent, and represents a really interesting 

 discovery. 



2. Myotomys *, geu. 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 premaxillae are always 

 clearly visible from above outside them. Interorbital region 

 not specially contracted ; its edges Avith 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 laminae and a posterior trefoil, which 



* livi-\-Otomys. 



