312 MOLLUSCA. 



B. lavis, Brown. 

 Cork and Bantry, Mr. Jeffreys. Shell-sand, deep water, Belfast Bay, Mr. 

 Hyndman, 1850. 



Genus Truncatella. 



T. Montagid, Lowe. 



W. T., Ann. Nat. Hist., vol. vii. p. 480. A specimen agreeing with Mon- 

 tagu's description of Turbo siihtruncata (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. vivtpara. 



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 (]\Ian. 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 

 Drajiarnaud'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 comnnmis 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 oi Algce in the ijool. 



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 AjTshire 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 



