46 ACHATINA, EAST AFRICA. 



brown. Whorls Sy 2 , the first 2y 2 smooth and glossy, uni- 

 form. Aperture sky-blue within, with a dark purple-brown 

 border within the acute lip-edge. Columella and parietal cal- 

 lous blue-white. 



Length 143, diam. 63, aperture 72 mm. 



Length 107, diam. 50, aperture 56 mm. 



Length 105, diam. 53, aperture 60 mm. 



Wasin Island, near the coast about 115 kilom. north of the 

 northern end of Zanzibar (Sir Charles Eliot). 



Remarkable for its very dark color, 27 specimens collected 

 agreeing in this. The spire shows the typical pantkera pat- 

 tern. It is larger than A. letourneuxi Bgt., and judging 

 from the description, it is smoother. 



Var. CHRYSODERMA Pils. n. v. PL 41, figs. 5, 6. 



Shell thin and light; white with a few narrow stripes or 

 with diffused patches of red-brown under a bright yellow 

 cuticle on the last whorl, the spire white with broad red- 

 brown streaks, fading on the left. Whorls 7% or 8. Aper- 

 ture fleshy-white within, the columella narrow, delicate. 

 Columella and parietal wall covered with a thin white callous. 



Length 126, diam. 58, aperture 68 mm. 



Length 115, diam. 56, aperture 62 mm. 



Mauritius (H. Cuming, 1852). 



? A. acuta REEVE, Conch. Icon., v, pi. 3, f . 11, not of 

 Lamarck. ? A. fulica REEVE, pi. 2, f. 8. 



Apparently mature, yet thin and light, with a thin, white 

 columellar callous. The specimens were received from Cum- 

 ing. 



41. A. ANTOURTOURENSIS Crosse. PL 35, fig. 16. 



Shell oblong-conic, rather slender, thin but moderately 

 strong, pure white, retaining small shreds of a thin buff 

 cuticle, immediately behind the lip. Surface but slightly 

 shining, delicately plicatulate and obsoletely decussate above, 

 the last whorl usually smoother. Whorls 7y 2 , slightly con- 

 vex, the last somewhat flattened between suture and periph- 

 ery, convexly tapering below; apex obtuse. Aperture white 



