154 CATALOGUE OF THE MOLLUSCA 
Not uncommon in the Laminarian zone, especially in the 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. wenictna, 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. 
Famizty. Neritina, D’Orbigny. 
Neritina fluviatilis, 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. 
Faminy. TUuRRITELLID&. 
55. TURRITELLA, Lamarck. 
1. T. rerEpRa, Linn. 
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 Lamarckii. 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. 
Faminy. Cerirarape, Mleming. 
Cerithium reticulatum, Da Costa, has been frequently found on 
