COILOSTELE. 343 



more delicate and a little less scalariform. The first two 

 are convex, the rest flat, swollen at the suture. The shell is 

 smooth. Length 2.5, diam. 0.5 mm. ; whorls 6. 



Egypt: drift of the Nile at Damietta. 



Coclestele cegyptiaca BGT., Descr. Orel., p. 12. 



Doubtfully distinct from the preceding. 



7. C. CYLINDRATA Boettger. PI. 50, figs. 6. 



Most related to C. rhaphidia Bgt., but the shell is more 

 exactly cylindric, narrower, apex more obtuse, the aperture 

 smaller. 



Shell small, subrimate, very slender, almost exactly cylin- 

 dric, thin, pellucid, glossy; spire with subparallel sides, 

 slightly tapering upwards, the apex very obtuse, globose. 

 Whorls 8, very slowly increasing, separated by a deeply 

 impressed suture, the upper ones more convex, the rest flat- 

 tened in the middle, rudely but subobsoletely costulate and 

 sometimes here and there varicose; costulae oblique, filiform, 

 compressed. The last whorl is flattened in the middle with 

 20 to 30 riblets, a little higher and scarcely wider than the 

 penult, whorl, equal to one-fifth the total length of the shell. 

 Aperture small, oblong, slightly acute above and below, re- 

 ceding at the base; peristome subcontinuous, the margins 

 distinctly but very delicately reflexed, columellar margin 

 broadly appressed, and callously reflexed above the rimation ; 

 columella sigmoid, in the middle very distinctly twisted or 

 with a unilamellate appearance. Length 3.25 to 3.75; diam. 

 0.75 to 0.875 mm.; alt. aperture 0.75, width 0.5 mm. (Bttg.). 



Asia Minor: debris of the Sarus river, Adana, Cilicia. 



Ccelostele cylindrata BTTG., Nachrbl. d. D. Malak. Ges. vol. 

 37, 1905, p. 109, pi. 2 A, f. 3o-c. 



The specimens, somewhat diverse diameter of the shell, 

 differ also rather strongly in sculpture ; a few smaller shells 

 are decidedly more finely striate, the larger however are 

 costulate; since however both forms agree in shape of shell 

 and mouth, a division into two species is scarcely to be 

 thought of. 



