EAST AFRICAN HOMORUS. 143 



convex and slowly increasing, separated by a rather horizon- 

 tal, simple, distinct suture. Aperture short, and the colu- 

 mella curved. Probable length of a perfect specimen 52 

 millims; actual length of shell, consisting of eight volu- 

 tions, 43 mm., diam. 11; aperture 9 long, 5.5 broad. (Smith). 



Near Lake Tanganyika (Thomson). 



Subulina solidiuscula SM., Ann. Mag. N. H. 1880, vi, p. 

 428 ; P. Z. S. 1881, p. 285, pi. 33, f . 16. 



This species and the next probably will prove, when the 

 apices are examined, to belong to Subulona. 



"Of this interesting form only a single specimen was ob- 

 tained. It is comparatively solid for a shell of this genus, and 

 also remarkable on account of the very elongate form and the 

 exceptionally slow increase of the volutions. The apex of 

 the shell is obtusely truncated, but this may be the result of 

 an accident in this instance, and not a constant specific char- 

 acter. The spiral or transverse striae are but feebly im- 

 pressed, but crossing the fine lines of growth give them a 

 crinkled appearance." (Smith). 



17. H. LENTUS (Smith). PL 60, fig. 79. 



"Shell subulate, imperf orate, very slowly enlarging, very 

 elongate and narrow. Whorls ? (probably 11 or 12), very 

 slightly convex, covered with a thin, glossy, pale olivaceous 

 epidermis, varied at intervals with darker oblique stripes. 

 Suture simple, rather oblique and deepish. Sculpture con- 

 sisting of fine oblique and feebly flexuous lines of increment, 

 faintly puckered at the upper extremity. Aperture small, 

 occupying less than one fifth of the entire length. Columella 

 very arcuate, abruptly truncated at the lower extremity. 

 Probable length 41 mm., actual length of seven remaining 

 whorls 36 ; diameter of the last whorl 7%, of the penultimate 

 7, of antipenultimate 6%; aperture 7% long, 4 broad." 

 (Smith). 



Near Lake Tanganyika (Thomson). 



Subulina lenta SM., Ann. and Mag. N. H. (5), vi, p. 428 

 (1880) ; P. Z. S. 1881, p. 284, pi. 33, f. 15. BGT., Moll, de 

 1'Afrique Equatoriale etc., p. 114, pi. 5, f. 5 (1889). 



