224 Mr. 0. Thomas on neto 



there is a marked difference in tlie sliape and position of the 

 minute extra tooth characteristic of Myosorex. In the latter 

 it is nearly in the centre line of the tooth-row, jammed closely 

 between the two usual unicuspid teeth, its transverse several 

 times greater than its longitudinal diameter, and looking more 

 like a piece of the cingulum of the first unicuspid than a 

 separate tooth. On the other hand in Surdisorex the tooth is 

 M(arly circular in section, and is placed in a more normal 

 position in the inner angle between the two larger teeth — in 

 fact, almost exactly as in the bat Trachops. 



Dimensions of the type (measured in the fl ^sb) : — 



Head and body 108 mm.; tail 25; hind foot 14. 



Skull: greatest length, including incisors, 265; basal 

 length 23 ; greatest breadth 12"8; front of i' to back of iu 

 11"2 ; breadth of palate between outer corners of nt^ 7 ; length 

 of lower tooth-row 10. 



Hah. East side of the Aberdare range, near Nyeri, British 

 East Africa. Alt. 9500'. 



Type. Adult femah'. B.M. no. G. 7. 8. 1. Original 

 number 7. Collected 5th November, 1U05, by Mrs. Holms- 

 Tarn. One specimen. 



This mole-like shrew is a most interesting little animal, 

 and Mrs. Holms-'i'arn is to be congratulated on its dis- 

 covery. She states that it appeared to be rare, as she only 

 saw this one example, although trapping in the locality for 

 some little time. 



MylomyS, gen. nov. {Muridce). 



General external characters and skull not markedly different 

 from those of Felomys. Fore limbs slender, the forearms 

 long and thin ; fifth finger rudimentary, with a short nail 

 instead of a claw, like the pollex. Hind feet long, the fifth 

 toe shortened, little longer than the hallux. 



Upper incisors each with a single clearly defined groove; 

 the grooves more external than in Pelojnys, the outer portion 

 of the tooth only about one half the breadth of the inner. 

 The outer part is also at a lower level, the groove and inner 

 part clearly visible in a lateral view. 



Molars large, the sj^ace between the two upper first molars 

 less than their breadth. Their structure peculiar, somewhat 

 as in CE7iomys, though more modified. In eacii lamina of the 

 upper series the centre cusp is raised in the middle to a point 

 and curved backwards, its grinding-surface pointing back- 

 wards and deeply concave, its enamel walls sharp and angular ; 

 inner cusp in each case about two thinls the size of the central 



