270 Herr F. Leydig on the Brood-cavities 



blue-grey as A. cahirinus or so red as A. dimidiatus. Fur 

 scarcely spinous, similar to that of A. subspinosus, Waterh., 

 quite different from that of all other species. Under surface 

 and limbs pure white. Tail longer than the head and body, 

 uniformly short-haired, nearly white, its upper surface faintly 

 greyer. 



Skull with the usual broad beaded interorbital region. 

 Interparietal large, its front edge strongly angular forwards. 

 Palatal foramina extending nearly to the level of the hinder 

 edge of ^1-1. 



Dimensions of the type (a male in spirit) : — 



Head and body 65 millim. ; tail 79; hind foot 16" 1 ; 

 ear 135. 



Skull : basal length 19"6 ; basilar length from henselion 18; 

 greatest breadth 12"7 ; interorbital breadth 4*4, interparietal 

 4"8x9*4; palate length from henselion ll'T; diastema 6'4 ; 

 palatal foramina 5*8 ; length of upper molar series 4'2. 



Hab. Henwaina Plain, 40 miles S. of Berbera. 



Ti/pe B. M. 95.5.28.3. Presented and collected by Mr. E. 

 Lort Phillips. 



This pretty little spiny mouse is evidently the Somali 

 representative of the Cape A. subspinosus, no other known 

 species having the same semispinous fur. 



Another Acomys from Somaliland is A. dimidiatus , Riipp., 

 which the lamented Prince B,uspoli obtained on the Webbi 

 Habir, and which is mentioned in the account of his 

 collection. 



Besides the Acomys, two specimens of Rhinolophus Anti- 

 norii, Dobs., were obtained by Mr. Lort Phillips near Berbera, 

 and these show, as Dobson expected, that the peculiar 

 structure of the tail-tip in the type was a mere individual 

 aberration. 



XLII. — The Brood-cavities of the Surinam Toad. 

 By F. Leydig, of Wiirzburg *. 



The nature of the cell-like cavities in the dorsal integument 

 of the female •P^pa dorsigera, wherein the young pass through 

 their embryonic development until they attain the adult form, 

 is a question not entirely devoid of importance for the mor- 

 phologist. The point is, do these cavities represent new 

 formations or invaginations of the integument produced after 



* Translated by E. E. Austen from the ' Zoologischer Anzeiger,' 

 Bd. xix. no. 495 (February 3, 1896), pp. 49-54. 



