Clare Island Survey — Land and Fresh-water Mollusea. 23 29 



*Ancylus fluviatilis Mull. — N.W. A large, very fragile, and strongly striated 

 form is found in the eastern Lough Nakeeroge, and also in Keel Lough. 

 Limnaea auricularia L. — N. Common in marshy spots in the sand-dunes 

 near Doo Lough, and also in the lake itself. Occurs more sparingly in 

 Keel Lough. All the specimens belong to the var. acuta Jeffreys. This 

 variety, which prevails all along the west coast and in the north of 

 Ireland, appears similar to some forms of the continental L. lagotis 

 Schrank. 

 L. pereger Mull. — N.S.W. Some interesting varieties of this shell occur on 

 the island, which go far to convince me of the great effect of environ- 

 ment on this, as well as on some other species. In the sandy lakes the 

 usual form is met with, with acute spire and inflated body-whorl ; while 

 in some of the peaty lakes, forms approaching L. involuta Harvey may 

 be found. An intermediate, referable to var. lacustris Leach, is to be 

 found in Keel Lough, which is a large sheet of water, but one not much 

 affected by peat. (Plate II, figs. 8-14.) 

 L. truncatula Mull. — N.S. Frequent; and is found even on the great bog 



north of Dooagh. 

 Planorbis glaber Jeffreys. — N. Occurs in Loughs Keel, Nambrack, and Doo ; 

 but appears rare, and during my last visit was not seen alive. 



*P crista L. — N. Common in the marshy portions of Lough Doo, and is also 

 found in Keel Lough. 



*Paludestrina stagnalis Baster.— S. Occurs along the muddy shores near 

 Achill Sound. 



*Pisidium pulchellum Jenyns. — N. Occurs in Lough Gall and in Keel Lough. 



*P. casertanum Poli. — N.S.W. Generally distributed, and is the only shell 

 which seems to inhabit some of the western lakes of the island. Occurs 

 in Lough Acorrymore — -550 feet altitude — but was not seen in 

 Bunnafreva Lough West. 



*P. obtusale Pfeiffer.— N.S. Occurs in Lough Gall and Sraheens Lough. 

 P. pusillum Gmelin. — N.S. Common in Lough Gall and in Sraheens Lougb, 

 and reported from Dugort by J. G. Milne. 



*P. personatum Malm. — N.S. Frequent in boggy drains with P. casertanum. 



*P. milium Held. — N. Common with Planorbis crista in Lough Doo. 



*P. steenbuchi Moller. — N. The first living specimens collected in Ireland 

 appear to have been those taken in Keel Lough. 



*P. lilljeborgi Clessin. — N.S. Common in Keel Lough among wind-drifted 

 material. This shell occurred among material collected for me at Keel 

 by the late Dr. G. W. Chaster in September, 1909, but was not recognized 

 at that time. It is also found in Sraheens Lough and Lough GalL 



