338 COILOSTELE. 



thirds the length of the penultimate; penultimate whorl 

 shorter than the rather convex last whorl. Suture strongly 

 margined, horizontal above, strongly oblique in the middle, 

 and slightly oblique towards the aperture. Aperture not di- 

 lated below, not half the total length of the shell; outer 

 margin rather strongly arching forward. Length 6 to 6.5, 

 diam. 2 mm. (West.). 



Spain: near Barcelona (Prof. P. T. Cleve). 



Cionella (Hohenwarthia) disparata WESTERL. Verhandl. 

 k.-k. zool.-bot. Ges. Wien, 1893, xlii, p. 43. 



Genus COILOSTELE Benson. 



Coilostele Bs., Annals and Magazine of Natural History, 

 3d series, xiii, p. 136 (Feb. 1864), for C. scalaris ~Bs.Coelo- 

 stele of some authors. Coelestele BOURGUIGNAT, Description 

 de diverses especes de Crelestele et de Paladilhia, p. 6 (1880). 

 Francesia PALADILHE, Annali del Museo Civico di Storia 

 Naturale di Geneva iii, 1872, p. 9, type F. scalaris Palad. 

 paladilhiana Nevill. 



Shell minute (3 to 4 mm. long), fragile, somewhat trans- 

 parent, imperforate, long and narrow, subcylindric or taper- 

 ing slightly to the very obtuse rounded summit, composed of 

 6 to 8 flattened whorls separated by deep sutures, the first 

 2!/2 or 3 whorls smooth, the rest either smooth, striate or 

 ribbed. Aperture small, oblong, more or less oblique, the 

 outer lip usually expanded slightly in fully adult shells, 

 straight in profile. Columella having a low fold at its junc- 

 tion with the parietal wall. Internal partitions absorbed in 

 adult shells, leaving only an internal spiral cord along the 

 sutures. Soft anatomy unknown. 



Type C. scalaris Bens. Distribution, India, Aden, Syria, 

 Abyssinia, Egypt, Southern Spain, Eastern Mexico. 



A genus of uncertain position, remarkable for the cylin- 

 drical shape of the minute, fragile slender shell, and the ab- 

 sorption of the internal partitions, which I have verified in 

 C. tampicolensis. They have been found up to this time only 

 as dead shells in the drift debris of rivers and streams, where 

 they occur in great profusion, though it seems quite locally. 



