Mammals f'rom Somaliland. 103 



Its upper molaia have respectively three, two, and one 

 separate laminie, placed very obliqiu-ly, without any evidence 

 of the more cuspidate character of the teeth of JJipodillus, 

 thouj^h younger specimens are needed before they can be 

 accurately de^^cribed. Below the anterior molar is quite 

 peculiar in shape (see figure ]i), its narrow anterior lobe and 

 the minute secondary cusps present on its outer side and at 

 its posteio-internal angle being without any resemblance to 

 what is found in Uipodillus or other members of the Ger- 

 billina'. The second lower molar has also a minute secondary 

 antero-external cusp, 



I.'j. Mus uUu'jjes, RUpp. 

 J. liM. llarar. 



14. Mus sp. (multlmammate). 

 ^. ]M. JIg-jiga. 



15. Acomys sp. 



? . lilO. Hargelsa. 

 A pale rufous form perhaps referable to ^1. Ilunteri, de Wint. 



llj. Acomys mullah, sp. n. 



(?. 123; ?. 125. Ilarar. 



Size fairly large. Spinous system less developed than 

 usual, the covering of the head, nape, and fore back rather 

 hisj)id than spinous, markedly less harsh than in the allied 

 species; spines of back about 11 mm. in length. General 

 colour of head, nape, and fore back pale slaty greyish, the 

 spines of the hinder back becoming tipped with fawn-colour 

 or vinaceous butfy ; posterior flanks and outer side of hips 

 more uniformly of the latter colour. Under surface and 

 inner side of limbs wholly sharply-defined pure white; outer 

 side of forearms to wrists and legs to ankles grey with a 

 tinge of fawn ; hands and feet white. Ears of medium size, 

 much smaller than in A. dimidiatus. Tail thirdy haired, 

 grey above, white below. 



kSkull with a very large broad and flat biain-case, the 

 ridges not unusually heavy. Palatal foramina very long, 

 reaching nearly to the level of the j)Osterior fourth of m^ 



Dimensions of the type (measured in the flesli) : — 



flead and body 111 mm. ; tail 109; hind foot 18; ear 18. 



Skull: greatest length 31'5; basilar length 24*6; zygo- 

 matic breadth 15 ; nasals 13 ; interorbital breadth 51; 



