110 ZOOTECUS. 



forms of insularis that without the locality they could not, 

 I think, 'be distinguished. A form of insularis is known 

 from the adjacent African mainland (Senegambia), as well 

 as from points in the Sahara; and it will probably be found 

 to extend across the continent in the arid zone. 



Cape Verde I. specimens vary a good deal, doubtless lo- 

 cally. Some specimens 10 mm. long have as many whorls 

 as others of nearly 17 mm. length. Captain King gives the 

 length of the type as a little less than four-eighths of an inch. 



Asiatic forms. 



Z. insularis is generally distributed in southern Arabia. 

 Jousseaume gives the localities : Mascat ; near Aden ; Dyobla, 

 between Aden and Sana Mahala, between Aden and Steamer 

 Point, to which we may add Djobla, north of Aden, the lo- 

 cality of Bulimus ducoureti Bgt. (Species noviss. Moll in Eur. 

 Syst. detectae, p. 20, 1876). Nevill states that in the Indian 

 Museum there are specimens from Sind, Kutch, Suliman 

 Range, Trichinopoly, Ceylon, Poona, Burwani Hills, Tinali 

 (Benares), Saharunpur (N.-W. Provinces), Pagan, Upper 

 Burma, etc. It is not found around Calcutta, These locali- 

 ties doubtless pertain to several forms of the species, not to 

 typical insularis alone. Ancey has given a review of the 

 Asiatic forms in Bull. Soc. Malac. France iii, 1886, pp. 60-64. 

 While typical insularis is common in India, the prevalent 

 type is 



Var. PULLUS Gray (pi. 26, figs. 26-28) a larger, opaque, 

 whitish shell, more or less tinted with reddish-brown on the 

 spire, and measuring as follows: 



Length 15, diam. above aperture 5 mm. ; whorls 9. 

 Length 13, diam. above aperture 4.9 mm. ; whorls 

 Length 10, diam. above aperture 4.3 mm. ; whorls 

 Length 9.7, diam. above aperture 4.5 mm. ; whorls 

 Length 8, diam. above aperture 3.8 mm. ; whorls 6^2- 

 The Arabian adenensis Pfr. and ducoureti Bgt. are scarcely 

 separable from pullus Gray. 



"Bulimus pullus. Shell ovate, subcylindric, subimperfor- 



