52 CURVELLA, EAST AFRICA. 



Length 12.8, diam. 5.5, aperture 5.8 mm. 

 Length 11.2, diam. 5, aperture 5.5 mm. 



9. C. GUINEENSIS ('Jonas' Phil.). PI. 7, figs. 4, 5. 



Shell rirnate, oblong conic, very thin, hyaline, pale citron- 

 colored, very finely striated, the spire acute. AVhorls 7, a 

 little convex, the last half the length of the shell. Aperture 

 ovate-oblong, lip acute, colurnella slightly twisted. Length 6, 

 width 2 lines (Phil.). Length 12, diam. 5, aperture 6^x3 

 mm. (Pfr.). 



Guinea. 



Bulimus guineensis Jonas, PHILIPPI, Abbild. u. Beschreib. 

 neuer Conch., i, p. 54, pi. 1, f. 4 (Oct., 1843). PFR., Monogr., 

 ii, p. 178. REEVE, C. Icon., v, pi. 86, f. 641. Bulimus guin- 

 aicus BOURGUIGNAT, Malac. de 1'Abyssinie, p. 65, in Ann. des 

 Sci. Naturelles, Zoologie, xv, 1883 (new name). 



The outer lip is weakly arched forward. It is more slen- 

 der than C. sulcata, very fragile and transparent. 



10. C. TERRULENTA (Morelet). PI. 9, figs. 42, 43. 



Shell finely perforate, ovate-conic, rather thin, slightly 

 shining, sculptured with close delicate riblets; corneous- 

 brownish. Spire conic, the apex somewhat obtuse. Whorls 

 7, convex, joined by an impressed suture, the last whorl ob- 

 scurely angnlar at the base, slightly more than one-third the 

 length of the shell. Aperture oval; peristome acute, unex- 

 panded, the right margin arcuate, columellar margin dilated, 

 narrowly expanded. Length 11, diam. 5 mm. (Morel.). 



Lope, on the banks of the river Ogooue (Ogowe), Gaboon 

 (French Congo). 



Bulimus tcrrulentus MOREL., Journ. de Conchyl., 1883, p. 

 398, pi. 10, f. 3. 



The surface sculpture consists of an oblique, regular, dense 

 and low costulation. This species may be an Opeas; it seems 

 not to have the sinuous peristome of Curvella. 



East African Species. 

 C. subviridesccns is imperf orate; the others are more or 



