1901. GriKRSON. — Notes on the Mollusca of Co. Leitrim. 1 1 1 



Helicidcz, H. rotundata is common in most damp places under 

 stones and leaves, H. rupestris on nearly all the limestone 

 walls in the southern part of the county, H. pygmcsa under 

 withered leaves at Mohill and other places. Under a 

 stone near Cloone I came across two specimens of H. aculeata. 

 H. aspersa I found at Mohill, Dromahaire, and Carrigallen. 

 H. nemoralis is common everywhere ; a variety with white lip 

 is common at Glencar. I found several broken shells of 

 H. arbustorum at Glencar, but could not find a live specimen. 

 H. rufescens at The Alt, near Dromahaire. H. hispida common 

 everywhere. 



Buliminus obscurus is to be found in a wall at Lough Gill ; 

 the only other places I have taken this shell are Ballysadare, 

 Co. Sligo, and Ballynalacken, Co. Clare, on limestone in each 

 case. Pupa anglica I found at M-anorhamilton and other 

 places in wet moss ; P. cylindracea is common everywhere. I 

 found the following species of Vertigo near Mohill : — 

 V. pygmcsa, V. edc?itata, and V. substriata. Balea perversa 

 occurred near Feenagh in a limestone wall ; Clausilia bidentata 

 is common on walls and trees. Cochlicopa hebrica and Cary- 

 chium minimum in wet situations, the latter on the roots of 

 grass. Succinea putris and S. elegans I found near Mohill, 

 but there is an uncertainty in distinguishing between them. 

 I found good specimens of Physa fontinalis at Lough Rinn. 

 The following species of Pla?iorbis were taken between Mohill 

 and the Shannon: — P. albus, P. spirorbis, P. vortex, P. cari- 

 natus. P. umbilicatus and P. eontortus ; P. parvus was found 

 in a limestone quarry near Mohill. In most of the lakes 

 and rivers are to be found Limncea peregra, L. ovata, 

 L. stagnalis, L. pa/ustris, L. truneatula, Ancylus ftuviatilis and 

 Sphcerium corneum. Velletia lacustiis I found in the stream 

 at Glencar and other places. In the Shannon I took Neritina 

 flnviatilis, Bythinia tentaeiclata, " Valvata piseina/is, and 

 V. cristata. The species of Pisidium which occurred com- 

 prise P.foniinalc, P. milium, and P.pusillum. Anodonta cygnca 

 is common in the lakes and canals in the southern part of the 

 county ; the finest specimens I got were from a pond at Mohill 

 Rectory. 



Clondalkin, Co. Dublin. 



