60 CATALOGUE OF THE MOLLXTSCA 



Not uncommon in the Laminarian zone, especially in tlie north 

 of Northumberland and south of Durham ; less frequent in the 

 intermediate district. Capt. Brown figures " a beautiful smooth 

 variety dredged in deep water, off Sunderland, by Mr. Dixon of 

 Bishop Wearmouth." 



54. MARGARITA, Leach. 

 1. M. HELICINA, Fab. 



Helix margarita, Mont. Test. Brit. Supp. 143. 

 On sea-weeds, and under stones, near low-water mark, fre- 

 quent. Common on the northern parts of the coast. 



Family. Neritid^, D'Orhigity. 

 Neritina fiuviatilis, Linn., has been frequently met with on 

 our coast, but as it is a common ballast shell, we attribute it to 

 this source. Mr. Hogg states that he found it in the vicinity of 

 Stockton, but he is not quite certain of its having been alive. 

 It is found in the Ouse at York. 



Family. Turritellid^e. 

 55. TURRITELLA, Lamarck. 



1. T. terebra, Li7in. 



Turbo terebra, Mont. Test. Brit. 293. 



On weedy ground in a few fathoms water, not uncommon, but 

 seldom thrown upon the shore, excepting in a very young state, 

 in which form it has been taken for a distinct species, and called 

 Turritella LamarcTcii. It is sometimes brought up pretty plen- 

 tifully in the trawl-nets by the fishermen at Cullercoats. 



The animal, from its broad proboscidiform head, and short 

 lateral tentacles, bears a great resemblance to Cerithium. It is 

 very shy and sluggish, and will lie for days together without 

 shewing itself beyond the mouth of the shell, or attempting to 

 crawl about. 



Family. Cerithiad^, Fleming. 

 Cerithium, reticulatum, Da Costa, has been frequently found on 



