CYLICHNA. 415 



This appears to be the Bulla Blainvilliana of Recluz, 

 and Volvaria subcylindrica of Brown. The C. strigella 

 of Loven was founded on fresh specimens of the present 

 species, having the striae more distinct than usual. I 

 do not regard the variety as the Bulla conulus of Des- 

 hayes (an Eocene and Miocene species), which is repre- 

 sented as much narrower at the top and wider at the 

 bottom, with the apex abruptly truncated, and the 

 spiral striee more remote. 



4. C. cylindra'cea*, Pennant. 



Bulla c?jlindracea,~Pemi. Br. Zool. iv. p. 117, t. Ixx. f. 85. C. cylindracea, 

 F. & H. iii. p. 508, pi. cxiv. b. f. 6, arid (animal) pi. W. f. 3. 



Body milk-white, pale strawcolour, or dirty white with a 

 faint tinge of yellowish-brown : [" mantle not thick, rarely 

 produced beyond the front and lateral margins of the shell ; 

 it is edged with a series of minute red papillae " (Clark) : ] head 

 snout-like, broad, wrinkled across, and truncated or slightly 

 cloven in front : tentacles united with the head, and forming 

 a kind of hood, which folds back over the front of the shell, 

 and is indistinctly bilobed above : eyes, none that Mr. Clark, 

 Mr. Alder, or myself coidd detect, although I carefully ex- 

 amined many specimens for that purpose ; but Forbes and 

 Hanley say, after describing the tentacles, "some way in 

 front of their bases are two very minute and obscure eyes : ' 

 foot rather short, assuming various shapes, being sometimes 

 triangular and at other times square, oval, or oblong, occasion- 

 ally semicylindrical and wedge-shaped in front, where it meets 

 the edge of the snout or head-flap ; it is slightly folded up at 

 the sides, and usually broader behind, which part is furnished 

 with two angular points : verge small, conical, and hyaline : 

 gizzard composed of three minute shelly plates, imbedded in 

 a muscidar mass ; these are semicylindrical and narrow. 



Shell forming a long cylinder of nearly the same breadth 

 throughout, solid, opaque, and rather glossy : sculpture, nume- 

 rous fine and wavy spiral striae, which are visible in fresh 

 specimens by the aid of an ordinary lens, but being slight 

 easilv disappear: epidermis brownish-yellow, darker at the 

 base : colour white under the epidermis, and having a bluish 



* Meaning cylindrical, but not a classical word. 



