164 PSEUDOGLESSULA. 



9. P. DIAPHANA Dupuis et Putzeys. PL 57, figs. 38, 39. 

 Shell imperforate, thin, fragile, pale yellow, diaphanous, 



but slightly shining, covered with a very thin, densely and 

 very minutely granulated cuticle. Whorls 7, all ornamented 

 with oblique ribs, convex, separated by a deep suture, the 

 last whorl very indistinctly subangulate. Lip simple, thin; 

 columella subtruncate, twisted, anteriorly retreating and 

 somewhat plicate. Length 25, diam. 10, length of aperture 



10, width 6 mm. (D. et P.). 

 Congo: Nsendwe (P. Dupuis). 



Pseudoglessula diaphana D. et P., Bull, des Seances Soc. 

 Boy. Malac. Belg. 1901, p. xxxvi, f. 7, 8. 



This shell differs from the preceding in being smaller, im- 

 perforate, very thin, fragile, yellowish, pale, transparent and 

 less glossy. The sculpture is analogous, but the riblets are 

 more distinct on the last whorl. It differs further by the 

 more convex whorls, deeper sculpture, the angulation very 

 weak or almost wanting, of the last whorl, etc. 



10. P. RETIFERA (Martens). PL 61, figs. 4, 5. 



Shell ovate-turrited, thin, closely striate, opaque; olivace- 

 ous-brown, uniform or streaked with brown. Spire conic, 

 subconcave towards the apex. Whorls 8%, the first and 

 second large, reticulate-pitted, subglobose; the third whorl 

 smaller; following whorls regularly increasing, with simple 

 suture; last whorl ovate, not angular. Aperture occupy- 

 ing about two-fifths the total length, subvertical, sinuate- 

 ovate, bluish inside ; peristome thin, unexpanded, the margins 

 joined by a very thin, pale callous; columellar margin arcu- 

 ate, at the base obliquely truncate. Length 35, diam. 13 

 mm., aperture 14 mm. high, 7.5 wide (Marts.). 



West Africa: Cameroons at Bonjongo (Buchholz), Kumbe, 

 Bonge, Kitta, N'dian, Bibundi (Sjostedt Dusen, Jungner). 



Stenogyra retifera v. MARTENS, Monatsberichte K. P. Akad. 

 Wissensch. zu Berlin, p. 260, pi. 3, f. 7, 8 (1876). Homorus 

 (Pseudoglessula) retifer KOBELT, Conch. Cab. p. 106, pi. 30, 

 f. 7, 8 (1895). Pseudoglessula retifera d'AiLLY, Bihang etc., 

 p. 105 (1896). 



