PSEUDOGLESSULA. 1G5 



"In good condition the shell is semi transparent and of a 

 silky luster. The last whorl is not angular, but there is never- 

 theless a flat thread-like carina, not mentioned by von Mar- 

 tens. " The original description was from immature speci- 

 mens, according to d'Ailly, who gives the dimensions, length 

 41, diam. 20 mm., the aperture 14 mm. high, 7.5 wide, 

 whorls 10. 



11. P. HETERACRA Boettger. PI. 61, fig. 96, 97. 



Differs from P. calabarica by the olivaceous, brown- 

 streaked and flammulate shell, the apex less acute; whorls 

 8, the upper 2y 2 very elegantly reticulate and pitted in the 

 interstices, the rest closely striate, here and there very obso- 

 letely spirally lineolate, the last whorl higher, almost two- 

 fifths the alt. of the shell, at the periphery subangulate in- 

 stead of being thread-carinate. Columella more curved, the 

 base more protracted, but much less abrupt, subperpendicu- 

 larly truncate. Length 31, diam. 11.5 mm. ; alt. of aperture 

 12.5, width 6 mm. (Bttg.). 



West Africa: Buea, Cameroons. 



P. heteracra BTTG., Nachrbl. d. d. Malak. Ges. 1892, p. 202. 

 Homorus (P.) heteracra KOBELT, Conchyl. Cab. p. 94, pi. 

 22, f. 5-8. 



Prof, von Martens considers this to be a large variety of 

 P. retifera. The figures are from Kobelt. 



12. P. SJOSTEDTI d'Ailly. PL 61, figs. 6, 7. 



Shell oblong-conic, turrited, rather solid, plicate-striate, 

 brown-olivaceous, here and there obsoletely ornamented with 

 darker streaks. Spire concave towards the apex, which is 

 cylindric and rather obtuse. Whorls 9%, the embryonic ones 

 reticulate-pitted, convex ; following whorls irregularly plicate- 

 striate, the last about one-third the total length, encircled with 

 a peripheral thread, hardly descending in front, tapering be- 

 low. Columella curved, margined with a white callous, some- 

 times rather abruptly, sometimes obliquely truncate. Aper- 

 ture subvertical, subtriangular-ovate, pearly bluish within; 

 peristome simple, acute, thin ; margins joined by a very thin 



