322 CYLICHNA. 



lines ; vertex obliquely truncated, crateriform, imperforate. Aper- 

 ture very narrow, linear ; coluraellar fold conspicuous. Alt. 8, 

 diam. scarcely 3 mill. (Old.). 



Simon's Bay, Cape of Good Hope. 



C. tl</o*a OLD., Proc. Bost. Soc. vii, p. 140 ; Otia, p. 113. 



Allied to C. h>v<>lnt<i Ad., but the outlines are more rectilinear 

 (Old.). 



C. ATLANTICA E. A. Smith. PL 27. fig. 97. 



Shell ovate-cylindrical, thin, pellucid-white, shining, rimate, nar- 

 rowly perforated at the vertex, transversely very delicately striated, 

 especially above and below. Aperture very narrow above, slightly 

 dilated below ; lip thin, produced above the vertex ; columellar 

 margin covered with a thin reflexed callus, obsoletely subtruncate 

 below. Alt. 5J, diam. 2-1 mill. (Sw.). 



St. Helena. 



Cylichna atlantica SMITH, P. Z. S. 1890, p. 297, pi. 24, f. 10. 



This species has more curved outlines than C. eylindrucea, has a 

 perforate apex, and an umbilical chink. The thin columellar cal- 

 losity extends up the whorl, and joins the upper extremity of the 

 outer lip (Sin.). 



Speries of unknown null tut. 



C. SARSII (Phil.) A. Adams. PL 59, fig. 6. 



Shell ovately cylindrical, posteriorly truncate, anteriorly pro- 

 duced, apex perforated, white, transversely very finely striated ; 

 aperture narrow; columella anteriorly with a single fold ; outer lip 

 posteriorly produced (Ad.). 



H'lhitnf u>iL-ii<>ir,i t Mus. Hanley). 



B. (Cylichna) wm Phil., A. AD., Thes. ii, p. .')<>!, pi. 125, f. U.~>. 

 I cannot find that Philippi ever described this species. 



C. LACTKOCINCTA E. A. Smith. rnfifjn 



Shell minute, cylindrical, pellucid, encircled by several inter- 

 rupted milky bands; with longitudinal, very fine, curved striV, 

 and transversely .striated below ; vertex umbilicate, surrounded l>y 

 ;iidcd maririn. Aperture narrow above, sensibly dilated be- 

 low ; colnmclla thickened, obliquely subtruncate. All. 'J', diam. 

 1 -Sm.). 



Jl'ihif'it inik/ 



C. lacteocincta SM., Ann. Mag. N. H. (4), ix, p. 352. 



