90 SUBULINA, EAST AFRICA. 



25. S. BICOLUMELLARIS Martens. PI. 14, fig. 40. 



Turrited, closely rib-striate, dirty brownish, lusterless, with 

 obtuse apex. Whorls iy 2 , the first rather globular, some- 

 what projecting, the second globose, smooth, the third still 

 of the same diameter but rib-striate ; the following whorls 

 regularly and slowly increasing in diameter, somewhat con- 

 vex, with moderately deep suture, the last whorl tapering and 

 rounded below. Aperture moderately oblique, three-tenths 

 of the shell's length, long-ovate; outer margin thin, a little 

 arcuate ; columellar margin rather vertical, formed of two 

 spiral cords ascending adjacent to and upon each other, 

 separated by a deep furroiv; below obliquely truncate. 

 Length 15, diam. 5, aperture 4.5 x 2 mm. (Marts.) 



Karevia, on the western foot of Runssoro, at an elevation 

 of about 1175 meters (Stuhlmann). 



8. bicolumellaris MARTS., Nachrbl. 1895, p. 186; Beschalte 

 Weichthiere p. 122, pi. 5, f. 25. 



Peculiar in the structure of the columellar margin, which 

 is formed of two adjacent cords. In one example, which 

 served for the illustration, these cords ran parallel and are 

 separated by a furrow ; in two others they are somewhat more 

 separated, somewhat diverging, and parted by a small flat 

 surface. Finally, there are from the same place two larger 

 specimens 17.5 mm. long, in which the upper cord is weakly 

 developed but the other scarcely indicated. There seems 

 thus to be a certain measure of variability, and perhaps in 

 old examples a reduction ( resorption ? ) takes place (Marts.). 



The structure of the columella reminds one of Digonaxis 

 cingalensis. 



26. S. SUBCRENATA Martens. PI. 14, fig. 41. 



Turrited, very weakly striate, yellowish, with pretty ob- 

 tuse apex. Whorls 9, the first small, wart-like, the second 

 and third inflated, nearly globular, equal, and smooth; the 

 following whorls regularly, slowly increasing in diameter, 

 scarcely 'Convex, ivith irregularly crenate suture ; the last 

 whorl tapering below and rounded. Aperture oblique, three 

 tenths the lengtHi, acutely ovate. Outer margin thin, a little 



