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 striae more remote. 



4. C. cylindra'cea*, Pennant. 



Bulla cyUndracea,'P erm. Br. Zool. iv. p. 117, t. Ixx. f, 85. C. eylindracea, 

 F. & H. iii. p. 508, pi. cxiv. b. f. 6, and (animal) pi. YV. f.'S. 



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 papilla3 " (Clark) : ] head 

 snout-like, broad, wrinkled across, and tnmcated 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 could detect, although I carefully ex- 

 amined many specimens for that purpose ; but Forbes and 

 Hauley 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 sUghtly 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 muscular mass ; these are semicylindrical and narrow. 



Shell forming a long cylinder ' of nearly the same breadth 

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

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

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

 easily disappear: epidermis brownish-yellow, darker at the 

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



* Meaning cylindrical, but not a classical word. 



