1907. Wklch & Stelfox. — Cork Conference. — Mollusca. 277 



this extreme southern section of Ireland, was also of great 

 interest, as showing that the retreat of the weaker species may 

 be in any direction in which greater freedom from competition 

 is assured, or may be expressed as following the line of least 

 resistance. 



The prevalence of albine varieties either of shell or animal 

 in Agriolimax agrestis, Avion atev, Hyalinia cellaria, Hy. 

 alliaria, Hy. p7ira, Hy. radiattila, Hy. excavata, Helix rufescens, 

 and Acme lineata, in some cases in considerable numbers, and 

 to the exclusion of the pigmented typical forms, was also a 

 remarkably noteworthy fact, for, according to some authorities, 

 the prevalence of the albine or semi-albine state, which is a 

 pathological phenomenon, is an indication that the species so 

 affected is approaching the limit of its area of distribution 

 either vertically or horizontally. 



The fauna, as far as our limited time allowed us to examine 

 it, has for its salient features the prevalence of species not 

 existent in England, or whose presence there is more or less 

 restricted to special regions or confined to widely separated 

 and discontinuous areas." 



For ease of reference, we give here the localities, and their 

 county divisions, mentioned in the list of species. 



3. Cork West. — The Gearagh, Lough Allua, Gouganebarra, 

 Ballinspittal, Courtrnacsherry, and Simon's Cove. 



4. Cork Mid. — Carrigrohane, Blarney, Ballyphehane, Kin- 

 sale, Farrangalway, Lough of Cork, and Cork City. 



5. Cork Bast. — Youghal, Aghada, Rostellan, and Doneraile. 



6. Watkrford. — Ardsallagh, Glendine. 



In the following list of species, Dr. ScharfFs nomenclature, 

 as in /. N., vol. I., 1892, is again adopted for reasons already 

 given in the Sligo report (I.N., Sept., 1904, p. 185.) 



List of Species. 



Vitrina pellucida, Miill.— Did not seem as common as in the north, 

 and was only taken alive at Gouganebarra. Dead shells were found 

 sparingly at Youghal and Rostellan. 



