224 "^h^ Irish Naturalist. [ vSept., 



Dublin garden snail, is exceedingl}^ rare at Clonbrock. Other 

 species of Helix observed were H. hispida, H. ericetorum, and. 

 H. ncmoralls. Not a trace anywhere of the common Helix 

 aspersa. Coclilicopa lubrica and Clausilia bidentata abounded ; 

 indeed, as Mr. Dillon observed, the denomination bidentata 

 seems somehow or other to have always been applied to very 

 common species. 



The rare Pitpa anglica — a species confined to southern 

 Europe and a few British localities — was abundant ; at any 

 rate it was more common than P. cyUndi'acea {umbilicatd). 

 Vertigo was represented by the sylvan V. edentula, whilst V. 

 pygmcca w^as noticed under stones at the roadside on the way 

 to Mount Bellew. 



Near the river I found among the thickly-growing reeds 

 Succinea Pfeifferi, which I think should be looked upon as a 

 distinct species, and not as a variety of the South European 

 S. elegans, as I formerly thought. 



In the Clonbrock river itself were taken Limncea stagnalis, 

 Physa fontinalis, Bythinia tentaculata, Valvata pisci7ialis, and 

 Neritina fluviatilis. In a cold spring near the house, I found 

 numerous very fine examples of a form somewhat intermediate 

 between the typical LimncEa peregra and L. ovata, and on 

 Doon Bog I secured specimens of L. truncatula. 



The more remarkable absentees, besides those already 

 referred to, include the following : Helix acuta, H virgata, 

 and H. intersecta, Balea perversa, Clausilia lamifiata, and the 

 genera Planorbis, A7icylus, and Sphceriimi. 



Altogether the demesne and the surrounding country of 

 Clonbrock are thoroughly good hunting-grounds for the 

 conchologist, and I am convinced that further search, 

 especially along the river Suck, whence Halbert brought 

 me Lim7icea palustris, would yield an additional number of 

 Species, 



