144 EAST AFRICAN HOMORUS. 



"The brevity of the aperture in proportion to the total 

 length of the shell, its narrow elongate form, and the slow 

 increase of the whorls constitute the chief characteristics of 

 this species. Spiraxis bistorta of Pfeiffer has a considerable 

 resemblance to it but has more convex whorls, a longer aper- 

 ture, and a different columella. " (Smith). 



Bourguignat states that this species occurs on the penin- 

 sula of Ubuari, which projects from the west side of Tan- 

 ganyika. It is very rarely found entire, he writes, the early 

 whorls being almost always wanting. When entire the ex- 

 cessively elongated spire is pyramidal, with 17 or 18 whorls 

 (pi. 60, fig. 80). 



18. H. CYLINDRACEUS (Bourguignat) . PI. 57, figs. 29, 30. 



Shell very long cylindric, rather solid, somewhat opaque, 

 slightly shining, uniform corneous-buff ; striatulate and at the 

 suture crispulate. Spire very much produced, cylindric, 

 scarcely tapering, obtuse at the summit. Whorls 17, convex, 

 closely coiled, separated by a rather deep suture; the last 

 whorl moderate, convex. Aperture suboblique, ovate; peris- 

 tome unexpanded, acute; columella short, slightly curved, 

 abruptly truncate below; outer margin straight, slightly re- 

 treating; parietal callous rather thick. Length 37, diam. 

 5, alt. apert. 5, width 5 mm. (Bgt.). 



East Africa: Ubuari peninsula, west side of Tanganyika, 

 in woods. 



Subulina cylindracea BGT., Moll, de 1'Afr. Equatoriale, 

 p. 115, pi. 5, fig. 2, 3 (1889). 



This singular Subulina, resembling a Rhodea, is so long that 

 it is almost always broken ; but with the fragments it is easy 

 to reconstruct it (Bgt.). 



19. II. JOUBERTI (Bourguignat). PI. 57, fig. 31. 



Shell slender, very long, cylindric, translucent, pale buff, 

 well striated, crispate at the suture. Spire much produced, 

 cylindric, a little tapering, at the summit obtuse and as if 

 mamillate. Whorls 12, convex, closely coiled, separated by 

 a deep suture, the last whorl minute, convex. Aperture 



