OPEAS, COMORO IS., ETC. 155 



10.3, diam. 3.9, aperture 3.9 mm., whorls 7. They have 

 the usual clear corneous color. 



Var. MAYOTTENSE nov. PI. 23, fig. 19. 



Shell openly perforate, clear whitish-corneous, very thin. 

 Sculpture of fine stria? and grooves, the post-embryonic 

 whorls being very regularly grooved. Length 7, diam. 2.3 

 mm., whorls 7. 



Comoros: Mayotte (E. Marie). 



This form is very similar to 0. clavulinum, but differs by 

 the regular and stronger sculpture of the spire. It is much 

 smaller than 0. johanninum and less conic. Some of the 

 specimens contain eggs. 



31. 0. VULGARE (Morelet). PI. 23, fig. 14. 



" Shell rimate, turrited, rather thin, arcuately hair-striate, 

 shining, diaphanous, pale corneous; apex somewhat obtuse. 

 Whorls 8, a little convex, the last more dilated, nearly equal 

 to one-third the length. Columella nearly straight, entire. 

 Aperture truncate-oblong, columellar margin longitudinally 

 dilated, reflexed. Length 8, diam. 4% mm." (Morelet). 



Comoro Islands: Anjuan (Humblot.) 



Stenogyra vulgaris MORELET, Journ. de Conch, xxxv, Oct. 

 1887, p. 286, pi. 9, f. 4. 



According to Morelet, this species resembles S. octona, 8. 

 cereola and 8. simpularia. The resemblance to 8. octona is 

 superficial, but the columella in vulgaris is not truncate. In 

 8. simpularia and cereola the columella is also truncate, 

 though very obliquely so, but these two are larger, more 

 deeply colored and decidedly less strongly striate. It seems 

 to be closely related to 0. johanninum, from the same island, 

 yet differs by its much greater, width. I have not seen 

 specimens. 



32. O. SPINULA (Morelet). PI. 23, fig. 15. 



"Shell small, arcuately rimate, turrited, apex tapering, 

 shining; very finely costulately-striate, translucent, corneous- 

 whitish. Whorls 7, rather convex, joined by an impressed, 



