EAST AFRICAN HOMORUS. 141 



In bamboo forest, about 2600 meters elev., Runssoro (Dr. 

 Stuhlmann). Compare the following species. 



13. H. LAGARIENSIS (Smith). PI. 60, fig. 84. 



Shell elongate, rather thin, whitish under a very thin buff 

 cuticle; spire produced, mamillate at the apex; whorls 9, a 

 little convex, sculptured with delicate, slightly oblique 

 growth-lines, 3 to 4 later whorls spirally striate, more or less 

 decussate. Aperture inversely auriform, hardly one-third 

 the total length; lip thin, arcuate. Columella somewhat 

 twisted, covered with a thin callous, narrowly truncate in 

 front. Length 31, diam. 10 mm.; aperture 9.5 long, 5 wide 

 (Smith). 



British East Africa: Lagari (Mr. Stewart Betton). 



Subulina lagariensis SM., Proc. Malac. Soc. Lond. VI, p. 

 69, fig. IV (March, 1904). 



Allied to S. mamboiensis Smith, but smaller, with shorter 

 and more convex whorls, and sculptured with spiral striae 

 upon the last three or four whorls, a character which is ab- 

 sent in that species. As in mamboiensis, the periostracum 

 here and there is indistinctly streaked with brown. The lines 

 of growth are rather stronger just below the suture than upon 

 the rest of the surface of the whorls, and have almost a 

 puckered appearance." (Smith). 



14. H. SILVICOLA Martens. PL 60, fig. 87. 



Shell turrited, rather slender, glossy, corneous-yellow, the 

 apex obtuse; whorls 11, the second, third and fourth slightly 

 convex, the diam. scarcely increasing, smooth; the following 

 whorls slowly and regularly increasing, nearly flat, lightly 

 striatulate, sculptured with recurved pliciform striae below 

 the suture, and painted with a few brownish varices ; the last 

 whorl subangular, rapidly tapering below. Aperture ovate 

 rather oblique, occupying two-ninths the length ; outer margin 

 thin, nearly straight, basal margin rounded, columellar mar- 

 gin very arcuate, dilated, distinctly truncate at the base. 

 Length 52, diam. 12, length of aperture 11.5, width 7 mm. 

 (Marts.). 



