Clare Island Survey — Land and Fresh-water Mollusca. 23 23 



Clausilia bidcntata, need not be commented upon. The peninsula consists in 

 reality of several low rocky masses which have once been islands, connected 

 to each other by extensive sand-dunes, and it provides even less shelter for a 

 molluscan fauna than any of the islands included in the survey. Along the 

 north coast — a part which I have not yet been able to visit — more favourable 

 ground probably exists. Though considerable areas of the sands are shifting 

 too constantly to harbour any fauna or flora, the list of xerophile species is 

 larger than that of any of the islands. The fresh-water fauna is — for such 

 an ultra- western locality — a large one. All the species are, however, typically 

 " western," and the list does not include any of the common central species, 

 such as Physa fontinalis, Limnaea stagnalis, or Sphaerium corneum. 

 The following is my list for the district : — 



List of Mollusks of The Mullet. 



Agriolimax agrestis. Cochlicopa lubrica. 



A. laevis. Carychium minimum. 



Vitrina pellucida. Pupa cylindracea. 



Hyalinia alliaria. Vertigo antivertigo. 



H. radiatula. V. pygmaea. 



H. crystallina. Succinea pfeifferi. 



Euconidus fulvus. Limnaea pereger. 



Arion ater. L. palustris. 



A. subfuscus. L. truncatula. 



A. intermedius. Aplecta hypnorum. 



A. circumscriptus. Planorbis glaber. 



Punctum pygmaeum. P. crista. 



Vallonia pulchella. P. spirorbis. 



V. costata. Paludestrina stagnalis. 



Helicella itala. P. ventrosa. 



H. intersecta. Pisidiurn milium. 



H. barbara. P. nitidum. 



Hygromia hispida. P. obtusale. 



Helix aspersa. P. personatum. 



H. nemoralis. 



As I have already said, the absentees from the above list need not be 



commented upon, but several of those contained in it are worthy of a passing 



remark. Although Vallonia pulchella is frequently met with on the western 



islands, its companion, V. costata, has been reported only from one of these 1 



1 V. costata occurs on Cruit Island in West Donegal, but it is only at high-water that this piece 

 of land is an island, being at uther times connected to the mainland by a broad sand-flat, across 

 which shells may be blown at times. 



