144 OPEAS, WEST APRICA. 



10. 0. ACMELLA (Morelet). PI. 24, fig. 37. 



"Shell rather small, turrited acieulate, apex a little ob- 

 tuse, crystalline, smooth. Whorls 7 slightly convex, mar- 

 gined with a denticulate suture ; the last whorl equal to one- 

 fourth of the entire length of the shell. Aperture ovately 

 lunate, with simple, arcuate margins, columellar margin a 

 little dilated above, renexed. Length 4.5, diarn. 1.25 mm." 

 (Morelet) . 



West Africa: environs of Mayomba, 120 miles N. W. of 

 Loango. 



Stenogyra acmella MORELET, Journ. de Conch. Jan. 1885, 

 p. 26, pi. 2, f . 4. 



"After Stenogyra pusilla from the Comoros which meas- 

 ures only 3 mm. in height, this species is the smallest that is 

 known to me. The columella of this species is not truncated ; 

 the whorls of the spire, a little convex, are joined by a nar- 

 .rowly margined suture, where the incremental striae, which 

 disappear on the rest of the surface, assume the form of 

 fine and regular folds. The shell is white, transparent and 

 crystalline." (Morelet). 



11. 0. RECISUM (Morelet). PI. 24, fig. 38. 



Shell imperforate, shortly turrited, thin, with arcuate in- 

 cised striae, hyaline, corneous, very glossy, pale brown. Spire 

 conoidal, apex rather obtuse. Whorls 6 plano-convex, the last 

 enlarged, exceeding one-third of the entire length of the 

 shell. Aperture semioval, margins simple, the columellar 

 margin sinuous, shortly revolute above. Length 6; diana. 

 2.25 mm." (Morelet). 



W. Africa : Mayomba, 120 miles N. W. of Loango. 



Stenogyra recisa MORELET, Journ. de Conch. Jan. 1885, p. 

 28, pi. 2, f. 5. 



"This little species, at first sight, recalls a little our 

 Ferussacia lubrica of which it has the gloss and form. It is 

 composed of six whorls a little convex, and the last relatively 

 more developed, which gives it the appearance of a Bulimus. 

 The aperture, in consequence, is rather large in proportion to 



