CURVELLA, WEST AFRICA. 51 



6. C. INORNATA Chaper. Unfigured. 



Similar in shape to C. sulcata, having also 5 whorls, but 

 differing in three constant characters: the whorls are more 

 globose, the sculpture consists of simple growth-striae usually 

 gathered into groups, very variable in prominence and often 

 inconspicuous ; and finally the columella is perfectly straight. 

 The species is also a little larger. 



Plantation Elima, Assinie, on the Ivory Coast (Chaper). 



Curvella inornata CHAPER, Bull. Soc. Zool. France, 1885, 

 p. 49. 



7. C. OVATA (Putzeys). PI. 7, fig. 8. 



Shell oblong-turrited, covered umbilicate, thin white, sub- 

 diaphanous, the apex obtuse. Whorls 6, ornamented with 

 close, arcuate, longitudinal riblets. Aperture oblong, the lip 

 acute, arched in the middle; columella straight, vertical, the 

 columellar margin reflexed over the perforation. Length 5.5, 

 diam. 2.5, length of aperture 2.5 mm. (Putz.). 



Congo basin: Nsendwe, Manyema. 



Hapalus ovatus PUTZ., Ann. de la Soc. Roy. Malac. de 

 Belgique, xxxiv, 1899, Bulletins, p. Iviii. 



8. C. CONCENTRICA (Reeve). PI. 7, figs. 9, 14, 15. 



4 ' Shell somewhat acuminately oblong, scarcely umbilicated, 

 whorls seven in number, rather ventricose, concentrically 

 finely striated, columella thinly reflected, aperture rather 

 large, sinuated at the upper part; transparent straw-color " 

 (Eve.). 



Length 12, diam. 5, aperture 5.5x2.33 mm. (Pfr.). 



Liberia (Rve., Cuming coll.) ; Cape Palmas (A. Gould). 



Bulimus concentricus RVE., Conch. Icon., v, pi. 88, f. 656 

 (Feb., 1850). PFR., Monogr., iii, 437. 



Reeve's figure is copied, pi. 7, fig. 9. Numerous specimens 

 from Cape Palmas are before me, one being drawn in figs. 14, 

 15. They have a straightly conic spire of 6% to 7 convex 

 whorls, the later ones densely sculptured with fine, unequal, 

 strongly arcuate striae. There is a small umbilical perfora- 

 tion below the reflexed columellar lip. Two shells measure: 



