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



regular striae rendering it very beautiful. Here, in addition to this 

 species, H. ericetorum and H. virgata were found by Mrs. Patterson, 

 and were abundant on the same plant, the H. caper at a being the 

 most plentiful. 



The distribution of H. caperata seems rather anomalous ; it is un- 

 known to me in the North of Ireland, but on the walls of the houses 

 in Portpatrick, one of the nearest parts of Scotland to this country, I 

 have remarked it ; about Ballantrae in Ayrshire it has not occurred 

 to me ; at the base of the cliffs at Salisbury Craigs near Edinburgh, 

 I in 1834 procured it in abundance. 



19. Helix ericetorum, Mull. Mont. p. 437. t. 24. f. 2 ; Gray, Man. 



p. 163. pi. 4. f. 37. 

 H. cespitum, (3. Drap. p. 109. pi. 6. f. 16, 17. 



This Helix differs from its nearest British allies, H. virgata, H. 

 Pisana and H. caperata, in being pretty generally diffused over Ire- 

 land and the adjacent islands ; most of the marine sand- banks around 

 the coast claim it, but H. virgata in some places appears to its ex- 

 clusion ; it likewise affects the most inland localities, from one of 

 which, near Portarlington, I have specimens so large as 9 lines in 

 diameter. An exception to the more ordinary places of its occur- 

 rence may be mentioned ; the ruins of Dunluce Castle, situated on 

 the summit of an insulated mass of rock, considerably elevated above 

 the sea. In localities in the north, but a few miles distant, and in 

 every respect presenting a similar appearance, I have remarked the 

 specimens in the one to be without exception either uniform in colour 

 or very faintly banded, and in the other not one to be of an uniform 

 colour, but all banded, and almost every individual darkly so. Dra- 

 parnaud's H. cespitum, /3. pi. 6. f. 15, 17., and Pfeiffer's H. cespitum, 

 taf. 2. f. 24. and j3. f. 25., are all very characteristic figures of our 

 H. ericetorum, as is Rossmassler's var. f. 516. This author's H. eri- 

 cetorum, f. 517. a. and b. likewise represent it. My fr'end Mr. E. 

 Forbes informs me that in the Museum at the Jardin des Plantes, 

 Paris, he in 1838 saw a young shell of this species marked " H. re- 

 velata, Belfast," and as presented by M. Michaud ; it is doubtless 

 one of a series of specimens, which, considering them to be H. erice- 

 torum, I had the pleasure of sending to this naturalist some time 

 before. 



Mr. O'Kelly of Dublin, to whom the shell belongs that was de- 

 scribed and figured by Capt. Brown in the Wernerian Memoirs as 

 Helix elegans, and in his " Illustrations," &c. as Carocolla elegans, 

 always considered it as an extraordinary state only of H. ericetorum, 

 and as such noticed it in the Dublin edition of Pennant's Brit. Zool. 

 vol. iv. p. 368. ed. 1818. To the same specimen Dr. Turton ap- 

 plied the term Helix disjuncta, Conch. Diet. p. 61. f. 63. ; in his 

 Manual (p. 40.) this author places it under H. virgata. See also 

 Gray, Man. p. 161. 



20. Helix rotundata, Mull. Drap. p. 114. pi. 8. f. 4—7. 



Zonites rotundatus, Gray, Man. p. 165. pi. 5. f. 44. 

 Helix radiata, Mont. p. 432. t. 24. f. 3. 



