58 CURVELLA, EAST AFRICA. 



Whorls 6 to 7, a little convex, parted by an oblique suture, 

 the last whorl long. Aperture vertical, inversely auriform; 

 peristome thin, simple, the columellar margin reflexed, ap- 

 pressed, the right margin projecting, curved. Length 12.5, 

 diam. 4.33, aperture 4.33x2 mm. (Smith"). 



Mount Chiradzulu and Zomba Plateau, 5,000 ft. 



Curvella whytei SM., P. Z. S., 1899, p. 588, pi. 33, f. 45. 



" Martens writes concerning this species: 'Distinct from 

 all my species by its slender form; C. delicata the nearest, 

 but also somewhat broader than yours. ' 



20. C. DELICATA ('Gibbons' Taylor). PI. 8, figs. 33, 34, 35. 



''Shell conic- turrite, elongate, very thin, semi-transparent, 

 glossy, of a pearly-gray color, clouded and rather opaque in 

 places, finely but very distinctly striulate transversely, the 

 striulge rather curved, with the convexity towards the aper- 

 ture; epidermis very thin; whorls 7-8, rather tumid, rapidly 

 enlarging, especially after the fourth or fifth whorl, the last 

 being much the largest and most tumid ; apex rather obtuse ; 

 suture deep and distinct; mouth rather narrow, ovate, some- 

 what oblong, lips almost parallel, outer thin and sinuous, 

 inner slightly reflected behind anterior end of aperture, 

 rounded; umbilicus narrow but rather deep. Length 0.275, 

 breadth 0.093 inches" (Taylor}. 



Zanzibar (Gibbons, Schmidt) ; Derema, Ussambara (Con- 

 radt), Monyonyo, Uganda (Emin Pasha). 



Opeas delicata Gibbons MS., TAYLOR, Quart. Journ. of 

 Conch., i, p. 281, pi. 3, f. 3. Hapalus d., MARTENS, Beschalte 

 Weichthiere, p. 130, p. 5, f. 16, with var, gracilior. 



"Rather diffused around Zanzibar, but not common; 

 usually under stones. A number were found by Mr. Gib- 

 bons in the interstices of a small piece of coral, lying on the 

 ground under a tree; a few yards away great quantities of 

 dead and old shells were lying among the grass, near some 

 bushes. 



"In March this species contains 3 or 4 large calcareous- 

 ehelled eggs" (Taylor). 



Var. gracilior Martens. Length 7, diam. 2.5, aperture 2.5x 



