106 ZOOTECUS. 



While -closely related to Z. insularis, this insular form dif- 

 fers 'by its very glossy and smooth surface without the char- 

 acteristic decussation of that species except on the earliest 

 whorls. The striation is weak except just below the sutures. 

 The lip and parietal wall are more heavily calloused than 

 usual in insularis, and the aperture is smaller. Reeve's fig- 

 ure represents a shell in which the dried animal shows darkly 

 through the shell. The specimen drawn in fig. 119 measures, 

 length 12, diam. above aperture 3.7, length of aperture with 

 peristome 3.3 mm.; whorls 9. 



Z. contiguus has been erroneously reported from Zanzibar. 

 Its presence on the island of Sokotra has not been confirmed 

 by the recent explorations there of several naturalists, but it 

 was found on the neighboring islet of Abd-el-Kuri. 



Bulimus teres (fig. 20). Shell subimperf orate, rather solid, 

 cylindric, very finely (especially at the sutures) striatulaite, 

 glossy, fleshy-whitish. Spire tapering above, apex obtusely 

 conic, suture impressed, submargin'ate. Whorls 9, a little 

 convex, the last about two-sevenths the length, subascending 

 in front. Aperture vertical, subpirif orm ; peristome lipped 

 and somewhat thickened, margins joined by a callus, the 

 right margin straight, subdilated in the middle, columellar 

 margin vertical, short, refiexed. Length 13, diam. 4, oblique 

 alt. apert. 4, width 3 mm. (Pfr.). 



2. Z. INSULARIS (Ehrenberg). PI. 26, fig. 21, and vars. figs. 



22-33. 



" Sub'Cylindric, apex tapering, subacute, glossy, whitish- 

 corneous, very finely transversely strialte, the striae narrower 

 towards the apex, pellucid, aperture semiovate, the margin a 

 little reflexed, lightly calloused, whorls 7 to 8, the three first 

 subequal in diameter. 



"Length 5*4, width 1% lines, whorls 8. 



"Length 5*4, width 1% lines, whorls 7." (Ehrenberg}. 



Cameran Island, in the Red Sea (Ehrenberg). The vari- 

 ous forms of the species extend from the Cape Yerde Is. and 

 Senegambia eastward to Egypt, Abyssinia, southern Arabia, 

 Beluchistan, Hindustan and Ceylon, and as far east as Upper 

 Burma. 



