SUBULINA, EAST AFRICA. 87 



and radula), pi. 5, f. 21 (shell). Subulina m., BGT., Malac. 

 Abyssinie, p. 82, pi. 9, f. 65-67. 



A very slender shell, resembling 8. intermedia Taylor in 

 this respect. 



Species of East and Central Africa. 



20. S. .ELEGANS Martens. PI. 14, fig. 35. 



Shell conic-turrited, with wide-spaced vertical riblets, 

 glossy, chestnut-brown, with obtuse apex. Whorls 9, the 

 first small, globular, smooth, the second inflated, rather 

 low, with distinct riblets, the third whorl not wider than the 

 second, the rest of the whorls regularly increasing in breadth, 

 weakly convex, with rather deep sutures; last whorl angular 

 at its greatest diameter, rather flattened and only weakly 

 striate beneath. Aperture scarcely oblique, rounded-quad- 

 rangular, about one-fourth the total length. Outer lip thin, 

 slightly arcuate; basal margin broadly rounded; columellar 

 margin strongly arcuate, somewhat thickened, white, dis- 

 tinctly truncate below. Length 10, diam. 3, aperture 2.33 x 

 1.5 mm. (Marts.}. 



Between Ngesi and Mwutan lakes, on the southwestern 

 side of the latter, also south side of Ngesi, various places in 

 Uganda, etc. (Stuhlmann). 



Subulina elegans MARTS., Nachrbl. 1895, p. 185; Beschalte 

 Weichthiere p. 121, pi. 1, f . 16 ; pi. 5, f . 17. 



From the angle on the last whorl and the rather rapid in- 

 crease of the whorls in breadth one might think these to be 

 immature specimens of some other species ; but it agrees with 

 none of the larger ones collected in the region. The shape 

 of the second whorl reminds one of Pseudoglessula calabarica. 

 The intervals between riblets are double the width of the 

 riblets themselves. (Marts.} 



21. S. LASTI (E. A. Smith). PI. 14, fig. 36. 



Shell slender, subulate, polished, olivaceous-brown, here and 

 there streaked with a darker shade; spire narrowed above, 

 mamillate at the apex. Whorls 11, -convex, striated with 

 delicate oblique growth lines. Aperture small, acutely oval, 



