PSEUDACHATINA. 217 



insertion of the lip. Spire convexly conic, the apex obtuse, 

 with the usual sculpture. Whorls 7, parted by a suture nar- 

 rowly margined by an impressed line, the first 4 whorls a 

 little convex, nearly smooth, the rest flattened, impressed be- 

 low the suture, more or less regularly roundly cristate- 

 plicate, the plicas especially prominent below the sutural 

 margin; last whorl nearly half the total length, behind, dis- 

 tinctly 'angular, the angle disappearing near the aperture. 

 Aperture oblique, subrotund, tricolored inside, showing there 

 the three color-zones of the exterior. Columella strongly 

 twisted inward, obliquely truncate, white. Peristome nar- 

 rowly reflexed, bordered with a whitish callous, the margins 

 joined by a whitish callous, thickened and opaque near the 

 columella, transparent near the outer lip. Length 45 to 50.5, 

 diam. 24 to 27 mm.; alt. apert. 20-22 mm. 



West Africa: Kamerun, at N'dian (Sjostedt). 



P. liljevalli D'AILLY,, Bihang, etc., p. 98, pi. 5, f. 1, 2 (1896). 



The smallest species yet known. The above account is 

 from d'Ailly. 



14. P. BUCHHOLZI Robert, PI. 7, figs. 35, 36, 38. 



Relatively smooth, but with a number of whitish tubercles, 

 some of them prolonged downwards below the sutural im- 

 pression, and bounded by a sharply incised furrow. Coloring 

 extremely handsome ; broad red-brown stripes alternating with 

 narrower whitish-yellow ones, and coalescent upon the lower 

 half of the last whorl. The aperture is beautiful bluish, the 

 lower half of the throat darker. The parietal callous has the 

 characteristic dark band, the broadly reflexed peristome with 

 a lighter lip. Length 80, diam. 43, alt. apert. 35 mm. 



West Africa: Kamerun. 



P. doivnesii var. buchholzi KOBELT, Conchyl. Cab., p. 16, 

 pi. 8, f. 4, 5, 6. 



This form is considered by d'Ailly to be specifically dis- 

 tinct from downesii, an opinion which seems, so far as I can 

 Jidge from a single specimen, to be justified. 



