SUBULINA, EAST AFRICA. 91 



arcuate ; basal margin rounded. Columellar margin strongly 

 arcuate, distinctly truncate basally, continued in a thin de- 

 posit above upon the parietal wall. Length 13, diam. 3.5, 

 aperture 6 x 2.5 mm. (Marts.) 



Migere in Butumbi, in leaf mould of the forest (Stuhl- 

 mann). 



8. subcrenata MARTENS, Nachrbl. 1895, p. 186; Beschalte 

 Weichthiere p. 123, pi. 5, f. 26, 26a. 



27. S. PERGRACILIS Martens. PI. 14, fig. 42. 



Shell very slenderly turrited, quite weakly striate, yellow- 

 ish, with rather obtuse apex. Whorls 10, the first small, wart- 

 like, the second and third equal, convex, smooth, the follow- 

 ing whorls regularly but very slowly increasing, rather flat 

 with simple, shallow suture; the last whorl tapering below 

 and rounded. Aperture oblique, scarcely one-fourth the 

 shell's length, ovate. Outer lip thin, rather arcuate; basal 

 lip rounded; columellar margin strongly arcuate, obliquely 

 truncate below. Length 13, diam. 3, aperture 2.5 x 1.25 mm. 

 (Marts.). 



Bukende on the Issango (Dr. Stuhlmann). 



S. pergracilis MARTS., Beschalte Weichthiere p. 123, pi. 5, 

 f. 27. 



Differs from 8. subcrenata Martens by the more slender 

 shape and absence of sutural crenation. In general similar 

 to the well-known S. octona, but notably more slender. 

 (Marts.). 



28. S. INTERMEDIA Taylor. PI. 14, figs. 43, 44. 



"Shell elongated, very slender, conic-cylindrical, very thin 

 glossy semi-transparent, of a glossy straw color, very finely 

 striolate in the line of growth; epidermis very thin; whorls 

 8-81/2, very oblique, convex, gradually tapering to apex, which 

 is obtuse and abrupt; the last whorl is but little larger than 

 the penultimate; suture very oblique, deep; mouth broadly 

 ovate; outer lip thin and curved; columella truncate with a 

 thin and somewhat indistinct layer of callus ; umbilicus obso- 

 lete. Length 0.375, breath 0.076. " (Taylor). 



