ACHATINA, WEST AFRICA. 23 



short spire. The granulation does not extend below the 

 periphery of the last whorl. 



Ancey has figured a shell from Ibahi, Ugogo, having much 

 the appearance of this species, but it is said to be similar 

 to A. gramdata in sculpture and coloration (J. de C., 1902, 

 p. 277). 



Group of A. occidentalis. 



19. A. OCCIDENTALIS Pilsbry, n. sp. PL 45, figs. 1, 2. 

 Shell ovate-conic, rather thin but strong, pure white under 



a thin straw-yellow cuticle, which is absent from the early 

 whorls. Spire rather long and straightly conic, the apex 

 obtuse. First whorl smooth, the next faintly rippled, the 

 rest of the whorls closely and finely striate, the striae more 

 or less irregular or anastomosing, decussated. On the last 

 whorl the stria? are coarser, and obsolete except near the 

 suture, giving place to very weak, coarse wrinkles; and the 

 spirals disappear except near the suture, where they are 

 rather weak. Whorls S 1 /^, convex, the last rather inflated 

 below. Aperture ovate, bluish-white within. Columella nar- 

 row, white, concave above, very narrowly truncate below, a 

 small ridge, terminating at the basal notch, behind it. Pari- 

 etal callous a transparent film. Outer lip brownish at the 

 edge. Length 70, diam. 34, length of aperture 34.5 mm. 



West Africa: Corisco Island. 



This rather glossy white species is distinguished by its 

 rather long spire, quite sinuous columella which is only nar- 

 rowly truncate, and the small aperture, less than one-half 

 the length of the shell. The last whorl is smooth except 

 near the suture. 



20. A. ALBICANS Pfeiffer. PL 19, fig. 30. 



Shell ovate-conic, thin, longitudinally striate, somewhat de- 

 cussate with spiral lines which are obsolete below the middle 

 of the last whorl, diaphanous, slightly shining, whitish. Spire 

 pyramidal, a little obtuse, the suture submarginate. Whorls 

 6y 2 , somewhat convex, the last a little longer than the spire, 

 slightly tapering basally. Columella vertical, rather narrow, 



