122 Mr. W. Thompson's Catalogue of the Land and 



Potamogeton, &c, in the drains of the bog-meadows near Belfast." 

 Between the fourth and fifth locks of the Lagan canal, a few miles 

 from this town, I have, at the end of September, procured many- 

 specimens, all of which were on the under side of the leaves of the 

 yellow water-lily {Nuphar luted) and great water- plantain (Alisma 

 Plantago) — Pond in the demesne at Moira, county Down, Mr. 

 Hyndman — Near Limerick, Mr. W. H. Harvey — Beechwood, near 

 Portmarnock, county Dublin, Mr. T. W. Warren — Glasnevin Bo- 

 tanic Garden, Dublin, Dr. Coulter— Finnoe, county Tipperary, Mr. 

 Edward Waller. 



3. Physa, Drap. 



1. P.fontinalis, Drap. p. 54. pi. 3.'f. 8, 9; Gray, Man. p. 251.pl. 



9. f. 110; Turt. Man. p. 127. f. 110. 

 Bulla fontinalis, Mont. p. 226. 

 Is common, and generally distributed over Ireland, occurring on 

 aquatic plants in stagnant and gently flowing water. It is subject 

 to considerable variety. 



2. P. hypnorum, Drap. p. 55. pi. 3. f. 12, 13; Turt. Man. p. 128. 



f. 113. 

 Aplexus hypnorum, Flem. ; Gray, Man. p. 255. pi. 9. f. 113. 

 Bulla hypnorum, Mont. p. 228. 

 Although much less common than P. fontinalis, is generally dif- 

 fused over the island, and found as frequently in very shallow, as in 

 deep water. 



4. Planorbis, Muller. 



1. P. corneus, Drap. p. 43. pi. 1. f. 42 — 44; Gray, Man. p. 258. 



pi. 8. f. 95 ; Turt. Man. p. 112. f. 95. 

 Helix cornea, Mont. p. 448. 

 Has been found only within a very limited portion of the island. 

 It still prevails in the locality recorded by Capt. Brown — near May- 

 nooth, in the county of Kildare. From about Naas in the same 

 county I have been supplied with specimens by Mr. R. Ball ; and 

 by the Rev. B. J. Clarke, with some obtained by him near Lea Castle, 

 Queen's county. 



2. Planorbis alius, Mull. Gray, Man. p. 259. pi. 8. f. 97 ; Turt. 



Man. p. 114. f. 97. 

 P. hispidus, Drap. p. 43. pi. 1. f. 45 — 47. 

 Helix alba, Mont. p. 459. t. 25. f. 7. 

 Prevails generally over Ireland. Specimens of P. glaber, Jeffreys, 

 which I owe to the kindness of their describer, seem to me (as to 

 Mr. Alder) identical with P. albus. 



3. Planorbis Icevis, Alder. Gray, Man. p. 261. pi. 12. f. 148. 



Is found in the north-east of the island. Early in the winter of 

 1832 I obtained a number of this species on aquatic plants (espe- 

 cially Callitriche aquatica), with P. imbricatus, in a small pond at 



