58 LITTORINIDiE. 



form, but is more solid and usually olive-coloured. It is 

 common enough on a cluster of submerged rocks, a mile 

 or two from the shore of Torquay in S. Devon (S. H.). An 

 extremely flattened variety is taken at Sunderland, (S. H.) 

 that reminds us not a little of the Coriocella perspicua. 

 Mr. Jeff'reys finds it on the Mumbles, near Swansea. 



The animal, with a sketch of which we have been 

 favoured by Mr. Alder, is white ; its tentacles are long, 

 subulate, bearing eyes on the outsides of their slightly 

 swollen bases ; the muzzle is rather narrow ; the foot is 

 rounded at each end, and slightly contracted at the sides 

 centrally ; the operculigerous lobe is broadly margined at 

 each side, and bifurcated behind ; the two tail-like furca- 

 tions are subulate and rather short, though conspicuous, 

 and extending beyond the end of the foot. In our plate 

 we have given a drawing of the changes of form in this 

 species during its development, observed and kindly com- 

 municated by our esteemed correspondent, Mr. Spence 

 Bate, of Swansea. 



Although much more common in the north than in the 

 south, this mollusk is very generally distributed around the 

 British shores, living on the characteristic sea-weeds of the 

 Laminarian zone. It is very fine and abundant in the 

 Firth of Forth. 



L. puTEOLus, Turton. 



Small, subglobose, often zoned, never of an uniform yellow ; 

 pillar canaliculated. 



Plate LXXII. fig. 7, 8, 9 ; LXXIV. fig. ,0. 



Cochlea parva. Da Costa, Brit. Conchol. p. 85, pi. 8, f. 12. 

 Helix fasciata, Adams, Trans. Linn. Soc. vol. v. p. 5, pi. 1, f. 20, 21 (badly), 

 from which Mont. Test. Br. p. 446. — Maton and Rack. 



