142 EAST AFRICAN HOMORUS. 



East Africa: Forest region between Albert-Edward and 

 Albert-Nyanza Lakes: between the Ngesi and Mwutan, etc. 

 (Stuhlmann) . 



Siibulina (Subulona) silvicola MARTENS, Nachrbl. d. d. 

 Malak. Ges. 1895, p. 184; Beschalte Weichthiere p. 119, pi. 

 5, f. 20. 



Intermediate between mamboiensis and usagarica, being 

 like the first in size and color, and resembling the latter in 

 the slimmer, less rounded form, and the sculpture. 



15. II. USAGARICUS (Smith). PI. 60, fig. 81. 



Shell slender, subulate, glossy ; whitish subpellucid, more or 

 less covered with an olivaceous brown cuticle. Spire attenu- 

 ate above, obtuse at the apex. Whorls 15, the apical ones 

 slightly convex, the rest flattened, slowly increasing; growth- 

 lines oblique, arcuately subplicate above at the suture ; suture 

 slightly crenulate and oblique; last whorl subquadrate. 

 Aperture acute oval, one-sixth the total length. Columella 

 arcuate, truncate in front, covered with a thin callous. Length 

 37, diam. 7 mm.; aperture 7 mm. long, 3.5 wide (Smith). 



East Africa: Usagara (Bishop Hannington) ; Kidete 

 (Emin Pasha). 



Stenogyra (Siibulina) usagarica SM., Am. and Mag. N. H. 

 (6), vi, p. 158, pi. 5, f. 17. 



This is a very elongate species with almost flat whorls. 

 The subplicate lines of growth, especially on some of the 

 upper volutions, give the sutural line a somewhat crenulated 

 appearance. S. foxcrofti Pfr. from Sierra Leone has longer 

 and more convex whorls and they are fewer in number. 

 (Smith}. 



16. H. SOLIDIUSCULUS (Smith). PI. 60, fig. 88. 



Shell elongate, subulate, rather solid, imperforate, white, 

 covered with a thin olivaceous epidermis, obliquely striated by 

 the lines of growth which are crossed by shallow spiral 

 stria? producing a somewhat granose or wrinkled surface. 

 Lateral outline rectilinear, slowly converging, apex obtuse, 

 truncated. Remaining whorls 8 in number, very slightly 



