1896.] NATURAL SCIENCES OF PHILADELPHIA. 539 



Anterior cusp of ml strongly indented by an enamel fold on the 

 anterior inner face and connected by a continuous enamel wall with 

 inner median cusp of the same tooth. Outer median cusp of m. 1 

 isolated. Inner and outer cusps of transverse sections of m. 2 and 

 *"• 3 coalescent. Single anterior and median pair of cusps of i^i 

 forming a coalescent trefoil. 



Measurements — Total length 160 mm. ; tail vertebrae, 95 ; hind 

 foot, 20; ear, from crown, 6. 



Skull — Total length, 24 mm. ; greatest breadth, 12.5 ; interorbital 

 constriction, 4.5; length of nasals, 9.8; length of mandible, 12; 

 with of mandible, 5. 



The type above described, is in alcohol and is a well-aged individ- 

 ual with teeth worn half way to the cusp bases. Another specimen 

 (No. 3,852) a dried skin with skull, taken on the same day as type 

 is an adult, but less aged, female. It differs only in being deep 

 ochraceous instead of being reddish above. 



Compared with G. pusillus Peters," to which it appears most 

 nearly allied, the type of smithi is distinguished by its splendid red 

 color, by the very small ear, relatively longer tail and smaller body. 

 The skull is of the same length as that of the type ofpvsillus. 



49. Otomys irroratus Brants. Brants' Otomys. 



A young specimen, labeled from Sheikh Mahomet, was brought 

 back in alcohol. It is a female and apparently about two-thirds 

 grown. It is light brown, darkly grizzled with black, the tail deep 

 black above, its underside being grayish. The hind feet are black 

 with brownish hairs along the outside near heel. The upper incis- 

 ors have two distinct (median and inner) anterior grooves and a 

 slightly concave flattening of the convex intervening space. The 

 lower incisors present one deep groove dividing the face of the tooth 

 into an outer third and an inner two-thirds ; along the inner edge 

 of the tooth face is a faint sulcus, and the intervening convexity is 

 faintly flattened medially. Owing to the immaturity of the tooth 

 these sulcations are less strongly developed than would ensue with 

 greater age, the fainter grooves only appearing at the alveolar sur- 

 face. 



50. Heterocephalus glaber Riipp. Hairless Mole Rat. 



An old adult female (No. 3,923) in perfect condition, preserved 

 in alcohol, is included in the exceptionally fine collection of small 



"Monatsb. Acad. Berl., 1878, p. 201. 



