690 Proceedings of the Eoyal Irish Academy. 



Planorbis contortus, L. 



Tipperary S. — Stream from Rathronan mill-pond, near Clonmel, 

 on a caddis-case, one. — A. M. Delap. 



Physa fontinalis, L. 



Tipperary S. — Near Clonmel. — A. M. Delap. 



Limnsea glutinosa, Miill. 



King''s Co. — River Brusna, at Clara.— C. Ashford. 

 Down. — Newry Canal, near Knockbridge. — C. Ashford. 



Limnaea involuta, Thomps. 



Of this interesting form, which, if distinct, is peculiar to Lough 

 Crimcaun, Cromaglaun Mountain, near Killarney, we have had 

 living specimens sent us in 1885, first by Messrs S. A. Stewart 

 and G. A. Holt, on the 14th of June, and again on the 28th of 

 that month, by Mr. W. F. de V. Kane, who observed that it was 

 very scarce and difficult to find. Of these specimens we have 

 made very careful coloured drawings, and Mr. Charles Ashford 

 has dissected one or two of them for us. The odontophores have 

 been placed in the hands of Mr. J. Darker Butterell, for the 

 purpose of being dissected out and mounted. 



Pending this and the results of Mr. Ashford's dissections of 

 allied species of Limnsea, we are not yet prepared to decide 

 whether L. involuta is to be regarded as a distinct species, or 

 merely as a form of L. peregra, its nearest ally. 



Limnaea peregra, Miill. 



Derry. — Coleraine, common.— Z. E. Adams. 



Tipperary 8. — Near Clonmel. — A. II. Delap. Grantstown, a 



few, June 26, 1885. — R. Rimmer. 

 Kerry. — Killarney. — S. Bendall. Abbey "Wood, Yalentia, several, 



May 20, 1871. — B. Sturges Dodd. Pools at Killarney, young, 



1867. — J. R. Hardy. 



Limnaea peregra v. ovata, Drap. 



Derry. — River Bann, Coleraine, numerous, small, with type. — L. 



E. Adams. 

 Tipperary S. — Near Clonmel. — A. II. Delap. Grantstown, two. 

 — R. Rimmer. 



Limnaea peregra monst, decoUatum, Jeff. 



Kerry. — Abbey Wood, Valentia, with type. May 20, 1871.-^5. 

 Sturges Dodd. 



