Freslrwater Mollusca of Ireland. 



17 



Canal ; at Lough Derg and Limerick it is found in the Shannon ; and 

 in the county of Tipperary in some of the tributaries of this river ; and 

 about Cork in the river Lee. The specimens which I possess from 

 the Shannon and Grand Canal are identical with the N. fluviatilis 

 represented by Rossmassler, and as distinguished from the N. Danu- 

 biaJis, N . strangulata* and N. transversalis. Icon. part. 2. p. 17, 18. 

 pi. 7. 



Fam. 2. Paltjdinidjs. 

 Paludina, Lam. 



1. P. vivipara, Lam. Gray, Man. p. 90. ph 10. f. 118. 



Cyclostoma viviparum, Drap. p. 34. pi. l.f. 16, 17. 



Helix vivipara, Mont. p. 386. 

 In his ' Irish Testacea,' p. 527, Capt. Brown notices this species 

 under the last-quoted name as found " in a stream near Newtown - 

 ards, county of Down ; rare"— -by a letter from this author I learn 

 that he himself procured 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 re- 

 ceived the information. I have not seen undoubtedly native speci- 

 mens either of P. vivipara or P. achatina. 



2. P. teniaculata, Flem. 



Helix tentaculata, Linn., Mont. p. 389. 



Bithinia tentaculata, Gray, Man. p. 93. pi. 10. f. 120. 



P. impura, Lam., Turt. Man. p. 134. f. 120. 



Cyclostoma impurum, Drap. p. 36. pi. l.f. 19, 20. 

 A common species throughout the island, generally approximating 

 Draparnaud's var. f. 20. pi. 1. more nearly than his normal shell f. 19. 

 I have on different occasions found the stomachs of Gillaroo Trout 

 from Lough Neagh filled with this Paludina. 



Fam. 3. Valvatad^e. 

 Valvata, Muller. 

 1. V. piscinalis, Lam. Gray, Man. p. 97. pi. 10. f. 114. 



Cyclostoma obtusum, Drap. p. 33. pi. 1. f. 14. 



Turbo fontinalis, Mont. p. 348. t. 22. f. 4. 

 Common, and generally distributed over Ireland. Many of my 

 middle-sized specimens correspond with Pfeiffer's V. depressa, in so 

 far as the figure and diagnostic description enable me to judge, Pfeiff. 

 part 1. p. 100. t. 4. f. 33. See Gray, Man. p. 98. This species is 

 very variable in the degree of elevation of its spire, and consequently 

 in its diameter relatively to its height. I have been favoured by 

 Edward Waller, Esq. with specimens of this Valvata collected at 

 Finnoe, county Tipperary, the volutions of which appear angular 

 from being spirally cut, as they occasionally are in various species of 

 Limneus, and the angles are marked with a white line. 



* Specimens from Carniola, named " N. strangulata, Menke," by M. Mi- 

 chaud, who favoured me with them, when compared with my N. fluviatilis, 

 fully bear this out. 



Ann. $ Mag. Nat. Hist. Sept. 1840. c 



