OPE AS, WEST AFRICA. 



145 



the size of the shell. The columella is sinuous but not trun- 

 cate. Finally, the glossy, transparent shell, of a pale fawn 

 color, is engraved with arcuate striae, quite strongly impressed, 

 and more apparent at the suture." (Morelet). 



12. 0. BOCAGEI Nobre. PI. 24, fig. 34. 



Shell turriculate, perforate; spire 'Composed of 7 or 8 dis- 

 tinctly rounded whorls; suture quite deep, ornamented with 

 denticulations produced by fine and nearly vertical grooves. 

 Columella weakly arcuate, the margin reflexed over the nar- 

 rowly open umbilical perforation; lip simple and a little re- 

 flexed. Color milk white with pearly reflections. Length 

 10, diam. 2.5 mm. (Nobre). 



Angola: forest of Mupepe, under dry leaves. (Newton). 



Opeas bocagei NOBRE, Molluscos terrestres e fluviaes da ex- 

 ploracao de Francisco Newton em Angola, p. 9, pi. 1, f. 15, 16, 

 in Annaes de Sciencias Naturaes, ix, 1905. 



13. 0. VIEIRAI Nobre. PI. 24, fig. 35. 



Shell elongate, turriculate, perforate, thin, longitudinally 

 striate. Spire composed of 7 or 8 much rounded whorls; 

 suture deep. Aperture oval, lengthened; columella straight 

 and a little bent to the left, reflexed over the umbilical cav- 

 ity; lip simple and sharp. Color corneous. Length 11.5, 

 diam. 2.75 mm. (Nobre). 



Angola: Gumba (Newton). 



Opeas vieirai NOBRE, Molluscos etc., p. 9, pi. 1, f. 17, 18, in 

 Annaes de Sci. Nat. ix, 1905. 



14. 0. WELWITSCHI Nobre. PI. 24, fig. 43. 



Shell turriculate, perforate, thin, ornamented with very 

 distinctly recurved striae, oblique from left to right. Spire 

 of 4 to 5 quite rounded whorls, the last forming more than 

 half the length of the shell. Aperture rounded-oval, a little 

 oblique; columella nearly straight, the margin reflexed over 

 the umbilical cavity which is narrow. Color yellowish, often 

 noticeably ferruginous. Length 7.5, diam. 3 mm. (Nobre). 



Angola: forest of Mupepe (Newton). 



