CjECILIOIDES OF AFRICA AND ARABIA. 37 



first two are scarcely convex, not increasing in diameter, but 

 cylindric like a pillar; the rest are convex; separated by an im- 

 pressed suture, last whorl ovate-convex, less than one-third the 

 total length. Aperture very oblique, ovate, angular above, peris- 

 tome unexpanded, acute; columella short, truncate. Length, 

 7, diam. 2, aperture 2x1 mm. (Bgt. ) 



East Africa: wooded valley of Bidaro, Choa, southern 

 Ethiopia (Soleillet). 



Ccedlianella ., BGT., Mollusques terrestres et fluviatiles 

 recueillis par M. Paul Soleillet dans son Voyage au Choa 

 (Ethiopie mfridionale), Sept. 1885, p. 22, pi. (1), f. 10. 



Remarkable for its cylindric two upper whorls. 



36. C. ISSELT (Paladilhe). PL 3, fig. 57. 



Shell imperf orate, subconic-cylindric, glossy, nearly smooth, 

 subpellucid, ivory white (in dead shells); spire tapering up^ 

 ward, the apex rather obtuse; whorls 6, slightly convex as 

 though twisted, rapidly increasing, parted by a narrow, im- 

 pressed suture, the penultimate whorl large in front, the last 

 whorl a little larger, scarcely one-third the total length, some- 

 what ascending at the aperture, the free margin a little arcuate. 

 Aperture subpiriform, a little oblique, angular above at the 

 insertion of the lip; peristome unexpanded, fragile, acute; 

 columella short, slightly arcuate, broadly and distinctly trun- 

 cate at the base; outer margin broad, nearly straight, basal 

 slightly arcuate; margins subparallel, joined by a thin callus. 

 Length 5, diam. 1.5 mm. (Palad.). 



Aden. 



Cacilianella isseli PALAD., Annali Mus. Civ. Genova iii, 1872, 

 p. 22 (probably not the figures). 



11 By its slim shape, approaching the cylindric, its more 

 twisted whorls, deeper suture and the appearance of the aper- 

 ture, C. isseli is distinguished from all of its congeners of the 

 Alpic center." 



Paladilhe probably had two species mixed in his lot of C. 

 isseli. The description is that of a Ctztilioides, possibly identical 

 with Nevill's second species (Handlist Ind. Mus. p. 162), 

 and with A. balanus of Hanley and Theobald (Conchologin, 



