312 
MOLLUSCA. 
B. Icevis , Brown. 
Cork and Bantry, Mr. Jeffreys. Shell-sand, deep water, Belfast Bay, Mr. 
Hyndman, 1850. 
Genus Truncatella. 
T. 3Iontagui, Lowe. 
W. T., Ann. Nat. Hist., vol. vii. p. 480. A specimen agreeing with Mon- 
tagu’s description of Turbo subtruncata (p. 300), but not very well with 
his figure (t. 10, f. 1), was found among shell-sand collected at Bundoran 
by Mrs. Hancock. 
Genus Paludina. 
P. vivipara. 
In his Irish Testacea, p. 527, Capt. Brown notices this species under the 
last-quoted name as found “ in a stream near Newtownards, County of 
Down ; rare ” : by a letter from this author I learn that he himself pro- 
cured the shell in that locality. Mr. Gray (Man. p. 34) incidentally 
notices Paludina achatina as an Irish species, but on inquiry from him he 
could not recollect from whom he had received the information. I have 
not seen undoubtedly native specimens, either of P. vivipara or P. acha- 
tina. 
P. tentaculata, Flem. 
A common species throughout the island, generally approximating to 
Draparnaud’s var. f. 20, pi. 1, more nearly than his normal shell, p. 19. I 
have on different occasions found the stomachs of gillaroo trout from 
Lough Neagh filled with this Paludina. 
Genus Littorina. 
L. communis , Turt. Br. 
Abundant around the shores of the island. 
The following note appears in my journal. — “ Belfast Bay, Sep. 23, 
1837. I observed a great many of the Littorina communis congregated 
and feeding upon a large frond of tangle ( Laminaria digitata) which had 
been cast into a rock-pool, where the plant does not grow. From the 
number of these molluscs on this plant, it was evidently very much pre- 
ferred to any of the spontaneous vegetation — and there were several spe- 
cies of Algce in the pool. 
L. rudis, Turt. Br. 
This species or variety is common around the shores. 
L.jugosa, Mont. t. 20, f. 2, 
Considered by authors as a variety of this, is common on all quarters of 
the rocky coasts. On those of Ayrshire I have collected it. 
L. petrcea, Mont. , 
Is much less common than the preceding Littorina , but found on every 
side of the island. Bundoran, Waterford coast. Portmarnock, Mr. 
Warren. 
L. tenebrosa, Turt. 
Although, like the last, met with on all sides of the coast, it is local. 
All the preceding species are chiefly found on rocks and stones, but this 
