46 CURVELLA. 



ing the lines of growth very plainly, of a pale olive-brown 

 color, rather lighter near the apex; apex large and obtuse, 

 spire elongated; whorls 9 to 10, very slightly convex and 

 gradually increasing; aperture pyriform, occupying rather 

 less than one-sixth of the entire length of the shell; labrum 

 simple, columella somewhat oblique and faintly reflexed; 

 suture very deep but narrow, slightly puckered at its edges. 

 Length 30 to 35, diam. 9, aperture 7x4.5 mm. (Craven). 



Magila, Ussambara, under moss growing on rocks (Craven) ; 

 Zanzibar coast, in woods under stones (Dr. W. Schmidt). 



Bulimus magilensis CRAV., P. Z. S., 1880, p. 217, pi. 22, f. 

 3. Opeas magilense MARTS., Beschalte Weichthiere D. Ost- 

 Afr., p. 126. 



Peculiar by its bright gloss and thick-edged aperture, 

 broadly rounded below; imperf orate. Prof. von. Martens 

 gives the measurements of Dr. Schmidt's specimen as length 

 50, diam. 8, aperture very oblique, 7.5x5.5 mm., whorls 



Genus CURVELLA Chaper, 1885. 



Hapalus ALBERS, Die Heliceen, 1850, p. 140, for Bulimus 

 grateloupi Pfr. Not Hapalus Billberg, Enum. Ins., p. 37, 

 1820 (Coleoptera). Curvella CHAPER, Bull. Soc. Zool. de 

 France, x, pp. 48, 49 (1885), for C. sulcata and C. inornata. 



Shell oblong-conic, perforate or imperforate, thin, translu- 

 cent, covered with a thin, pale cuticle (as in Opeas) ; growth- 

 lines strongly arcuate. Apical whorl obtuse, rounded and 

 smooth. Aperture ovate, the outer lip acute, arching forward 

 in the middle, retracted at suture and base ; columella slightly 

 sinuous or straight, curving into the basal margin. Central 

 tooth of the radula narrow, laterals tricuspid. Type C. sul- 

 cata Chaper. 



Distribution, Africa, India, East Indies. Illustrated on 

 plates 6 to 9. 



This genus is separated from Opeas by the forwardly 

 arched outer lip, the shorter, wider contour, and usually 

 smaller number of whorls. The columella is frequently sin- 

 uous. In some cases the separation from Opeas seems some- 



