82 SUBULINA, WEST AFRICA. 



9. S. NORMALIS (Morelet). PI. 13, figs. 25. 



Shell subulate-turrited, with somewhat obtuse apex, thin, 

 diaphanous, glossy, finely and densely striate, corneous. 

 Whorls 9, a little convex, the first smooth, the last indistinctly 

 angular, more than one-third the total length. Columella 

 callous, obliquely truncate, not reaching the base. Aperture 

 semioval, peristome unexpanded, acute and thin. Length 21, 

 diam. 5.5 mm. (Morel.}. 



Toumby, not far from Landana. 



Stenogyra normal-is MOREL., Journ. de Conchyl. 1885, p. 



24, pi. 2, f. 7. 



Morelet further notes that the increase is slow and gradual, 

 the whorls moderately convex, suture strongly impressed, the 

 surface glossy, engraved with straight, regular fine strioe 

 except the embryonic whorls which are smooth. The chief 

 difference between this shell and S. octona is, aside from the 

 size, in the convexity of the whorls of the spire, much more 

 pronounced in the latter, which in general shape is turrited, 

 while normalis is rather subulate. 



Specimens received from Morelet resemble rather closely 

 von Martens' figure of 8. angustior; but the embryonic 

 whorls have a finer subsutural crenulation and the inter- 

 mediate whorls are more regularly though I think less sharply 

 striate than 8. angustior. 



10. S. GRACILENTA (Morelet) . PI. 13, fig. 20. 



Shell turrited-subulate, thin, covered with a corneous-ful- 

 vous epidermis, with an oily glass, sculptured with narrow, 

 straight striae. Whorls 9, slightly convex, the last one-fourth 

 the length of the shell, indistinctly angular around the base. 

 Columella straight, obliquely truncate. Aperture small, semi- 

 oval, the margins thin and unexpanded. Length 12, diarn. 

 3 mm. (Morel.). 



Mayumba, north of Landana. 



Stenogyra gracilenta MOREL., Journ. de Conchyl. 1885, p. 



25, pi. 2, f. 8. 



Distinguished by the slim shape and tapering spire, which 



