SUBULINA, WEST AFRICA. 83 



is much less obtuse at the summit than in any of its con- 

 geners. The whorls increase slowly, and are but slightly 

 convex, though the suture is quite deep. The shell has a 

 horny appearance, covered with a russet epidermis, and 

 shows fine, superficial striae which tend to become obsolete 

 on the last whorl. 



11. S. MEGASPIRA Mabille. 



Shell turrited-subulate, imperforate, very glossy, sooty- 

 corneous, very finely striatulate. Whorls 13%, a little con- 

 vex; separated by a well impressed, simple suture, the last 

 whorl distinctly angular, exceeding one-fifth the length of 

 the shell. Aperture small, ovate ; the peristome unexpanded, 

 acute; columella thin, incurved, distinctly truncate. Length 

 20 to 22 mm., length of aperture 5, width 2.5 mm. (Mob.). 



Congo region. 



Subulina megaspira MAB., Bull. Soc. Philomathique de 

 Paris, (7 ser.) viii, 1884, p. 40. 



Differs from Achatina involuta Gld. by the number of 

 whorls, the slimmer shape, lighter color not different on the 

 base, etc. It may possibly be a Homorus, but the very bril- 

 liant gloss and polished surface, on which growth-lines are 

 visible only with the aid of a strong lens, are features more 

 like Subulina. 



12. S. KASSAIANA Ro'chebrune & Germain. PI. 12, fig. 13. 



Shell imperforate, very slender, long-cylindric, rather solid, 

 translucent, a little shining, corneous greenish, moderately and 

 regularly striatulate. Spire very long, cylindric, obtuse at 

 the summit, apex obtuse, the embryonic whorl very minute. 

 Whorls 8, convex, slowly increasing, separated by a deep 

 suture, the last whorl convex. Aperture oblique, ovate, buff 

 within; peristome unexpanded, acute; columella short, rather 

 stout, abruptly truncate below. Length 12.5 to 14.5, diam. 

 3 to 3.5 mm., aperture 3 x 2 or 2.5 mm. (E. & G.). 



Congo, confluence of the Kassai, 300 meters elevation 

 (Bozas exped.). 



Subulina kassaiana R. et G., Bull. Mus. d'Hist. Nat., Paris, 



