34 Mr. W. Thompson's Catalogue of Irish Mollusca. 



Tipperary, by E. Waller, Esq. Ours differ in no respect from En- 

 glish specimens supplied me by Mr. Alder, and are identical with 

 specimens from Dauphiny, marked " H. lucida, Drap." by M. Mi- 

 chaud, to whom I am indebted for them. 



29. Helix excavata, Bean, Alder. 



Zonites excavatus, Gray, Man. p. 175. 

 Of this handsome shell I have yet seen but a single Irish specimen, 

 which was obtained at Dunscombe Wood, near Cork, by Miss King 

 of that city. On being shown to the Rev. T. Hincks, he at once 

 identified it with H. excavata, and, with the kind permission of the 

 owner, sent it to Belfast for my inspection ; it in all respects agrees 

 with English specimens of this Helix favoured me by Mr. Jeffreys 

 and Mr. Alder. 



30. Helix crystallina, Drap. p. 118. pi. 8. f. 13 — 18; Turt. Man. 



p. 58. f. 42. 

 Zonites crystallinus, Gray, Man. p. 176. pi. 4. f. 42. 



Is generally distributed in Ireland, occurring in moss, under 

 stones, upon decaying wood, &c, in dry and wet situations, though 

 in the latter more frequently. Some adult specimens which I have 

 collected have had but 3 \ volutions instead of 4£ or 5, the ordinary 

 number. Extensively as I have collected this Helix in Ireland, none 

 but dead specimens would come under Draparnaud's var. " /3 eburnea 

 subopaca." The animal is of a white colour. 



Mr. Alder's views in reference to the last eight species {Hyalines, 

 Fer.), are here adopted ; but even the British species and their va- 

 rieties belonging to this division seem not yet to be satisfactorily 

 cleared up. The application of the same name too, by British and 

 continental authors to different species, adds much to the confusion. 

 Ireland possesses all the British species as distinguished by Mr. 

 Alder, viz. H. cellaria, H. nitidula, H. lucida, H. excavata, H. alli- 

 aria, H. radiatula, H. pura, H. crystallina. Rossmassler's H. nitens, 

 f. 524 and 525, are very characteristic representations of shells I pos- 

 sess from different parts of Ireland, and with his H. glabra, f. 528, 

 so far as a figure and diagnostic description will suffice for judg- 

 ment, I have specimens identical. 



on leaving it undisturbed for about a fortnight I generally find one or two 

 specimens under it. The field is marshy ; and here I also find Vertigo palus- 

 tris, but only within the space of a few square yards of the most marshy part. 

 A little higher up, in the same field, Vertigo pygmtza is obtained. On going 

 my rounds about once a fortnight, I procure a fresh crop of specimens of all 

 three species from each spot !" 



[To be continued.] 



