CYLICHNA. 411 



edge : head depressed : tentacles united with the head, and 

 forming together an elongated and right-angled disk, which 

 is recumbent on the front of the shell : eyes none (?) : foot 

 very long, expansile behind : gizzard calcareous. 



Shell altogether external, and cylindrical ; spire concealed : 

 mouth extending the whole length of the shell, contracted 

 above and widening below : pillar furnished with a more or 

 less obscure fold : operculum none. 



Loven included in this genus several species of Utri- 

 culus. Cylindrella, Swainson, has priority of publi- 

 cation ; but that author gave the same name to a genus 

 of Corrida, and Pfeiffer also applied it to a genus of 

 Helicidce : the latter application has been confirmed by 

 general usage. 



1. Cylichna acuminata*, Bruguiere. 



Bulla acuminata, Brug. in Enc. Meth. (Vers) t. vi. p. 376. no. 9. Ovula ? 

 acuminata, F. & H. iii. p. 500, pi. cxiv. b. f. 3, as 0. acuminata. 



Shell regularly spindle-shaped, or forming an elongated 

 oval which is pointed above and broad below ; it is thin, 

 almost transparent, and glossy: sculpture, slight spiral striae 

 at each end, and very faint microscopic lines in the same di- 

 rection on the intermediate space ; the strise near the apex are 

 fewer and more remote than those near the base : epidermis in- 

 conspicuous : colour clear white : mouth very long, commencing 

 at the top in a short and slightly recurved spike, and gra- 

 dually widening towards the base, where it is expanded and 

 rounded : outer lip flexuous, with a sharp edge : inner lip 

 consisting of a mere film on the upper part and in the middle, 

 but thickened and reflected at the base, so as to give the 

 pillar the appearance of having a short fold : pillar twisted, 

 and bending a little to the left. L. 0*15. B. 0-075. 



Habitat : Muddy sand in the coralline zone, on the 

 coasts of Cornwall (M f Andrew, Barlee, and Hockin) ; 

 Plymouth among trawl-refuse, and dredged off the 

 Arran Isles in co. Galway (Barlee) ; south of Ireland 

 (M f Andrew) \ co. Antrim, 25 f. (Hyndman and Waller) ; 



* Pointed. 



T 2 



