CONOVULUS. 
191 
(p. 219. f. 1, 2. Montagu^ T. 340. ; Sturm^ t. 1. 
f.3.) 
Shell hardly the tenth of an inch long, conic, 
white, shining, with a yellowish cast, transparent ; 
spire composed of five rounded volutions, very finely 
striate longitudinally, and ending rather obtusely ; 
aperture semioval or rather ear-shaped, rounded at 
both the ends, with two teeth on the pillar, and some- 
times a small one above the others; the margin 
thick, and in the middle of the outer lip a thick 
tooth-like protuberance. 
2. CONOYULUS. (Conovulus.) 
Shell oval, obconic; last whorl long, compressed; 
mouth linear; pillar with two or three spiral 
plaits ; outer lip simple or very slightly reflexed ; 
throat grooved. 
The foot of the animal is obovate, oblong, blunt 
in front and behind ; tentacles Fig. 46 . 
contractile, filiform, slightly 
ringed ; eyes at their inner 
base ; muzzle porrect, notched 
in front, as in Limnceus ; mantle 
closed all round, with the excep- 
tion of a perforation at the point 
of junction of the outer and Conovulus dentkuhtus. 
inner lip. The pillar of the shell is plaited in all 
ages. 
The animal, in habit, manner, and appearance, 
very greatly resembles that of Aplexa or Limnceus, 
but differs in the tentacles being filiform and ringed. 
