48 CURVELLA, WEST AFRICA. 



bb. Aperture half the shell's length; sculpture of 

 arcuate, spaced grooves. 



c. 9x4 mm., whorls 5. C. sulcata, no. 1. 

 cc. S^xS 1 /^ mm., whorls 7. 



C. daillyana, no. 2. 



1. C. SULCATA Chaper. PL 7, figs. 1, 2. 



The shell is very regularly conic and composed of 5 whorls ; 

 thin, transparent, olivaceous, the whorls not globose, and the 

 suture in consequence not very deep. They are ornamented 

 with flat, glossy plaits, very regularly spaced, separated by 

 narrow intervals, and curved like the lip-edge. The colu- 

 mella is a little curved. Length 9, diam. 4 mm. 



Coffee plantation of Elima, lagune d'Assinie, on the Ivory 

 Coast (Chaper). 



Curvella sulcata CHAPER, Bull. Soc. Zool. de France, 1885, 

 p. 48, pi. 1, f. 10, 11. C. striata JOUSSEAUME, Proces-verbaux 

 de la Soc. Zool. de France, 1885, p. xxii (error for sulcata). 



Type is in the collection of the Ecole des Mines. The aper- 

 ture seems from the figure to be about half the length of the 

 shell. 



2. C. DAILLYANA Pilsbry, n. n. PI. 7, fig. 3. 



Shell subfusiformly long-ovate, imperforate, glossy, sub- 

 perpendicularly arcuately impressed sulcate ; spire long-conic 

 with rather obtuse apex. Whorls 7, a little convex; separ- 

 ated by a margined, impressed suture, slightly ascending at 

 the aperture; last whorl tapering basally, about half the 

 length of the shell. Aperture vertical, sinuate-long-ovate; 

 columella strongly twisted ; peristome unexpanded, acute, the 

 right margin noticeably arcuate, moderately produced arcu- 

 ately in the middle ; columellar margin widely reflexed above, 

 adnate, callously thickened forming a duplication; below 

 bending strongly to the left, joining the basal margin with a 

 curve. Length 8.5, diam. 3.33 mm. (d'Ailly). 



Kamerun: Ekumba-Liongo (Duzen) ; Buea (Jungner). 



Hapalus sulcatus D'AILLY, Mollusques terrestres et d'eau 

 douce de Kameroun, in Bihang till K. Sv. Vet.-Akad. Handl., 



