1915- Stklfox. — Mollusca of Dingle Prouiontory. 35 



only Physa /oiUincilis has penetrated further than the 

 Castlegregory marshes, although extensive marshes, similar 

 to those near Castlegregory, exist at Smerwick and in other 

 places. This sheh, alone, of the " central" species, occurs 

 in Lough Anscaul, which lies to the south of the main 

 watershed of the peninsula. 



There are but few absentees from the list which need be 

 referred to. Geomalacus maculosus was not found, although 

 carefully searched for, in suitable weather, which is strange 

 when one considers its abundance at Caragh Lake, across 

 the waters of Dingle Bay. Hyalinia lucida does not appear 

 to have been introduced so far, but it is plentiful at Tralee 

 in the town rubbish -heaps ; and its introduction with 

 merchandise to Dingle and other towns is not likely to be 

 long delayed. Once introduced it will no doubt follow in 

 the footsteps of Hygromia ru-fescens and spread rapidly. 

 Succinea putris does not appear to have penetrated further 

 west than Killarney, and S. oblonga could not be found. 

 The semi-marine species Phytia myosotis, Ovatella hidentata 

 and Otina otis were not searched for. Planorhis umhilicatus 

 occurs in the coastal marshes north of Tralee, near Ardfert , 

 but was not seen nearer to the present district. The nearest 

 record for Planorhis contortus is the Gap of Dunloe, while 

 Valvata piscinalis, V. cristata, and Bithynia tentaculata are 

 not known to hve nearer than the Shannon basin. All the 

 available evidence, therefore, points to the conclusion that 

 the bulk of the freshwater molluscan fauna of the pro- 

 montory has spread during comparatively recent times 

 from the adjoining mainland. Whether this migration is 

 still going on future work alone can show ; but I am inclined 

 to think that will prove to be so. 



Deposits containing Land Shells. 



Considering the great amount of blown sand which is to 

 be found on all sides of the promontory, deposits containing 

 land -shells must be numerous ; but I had practically no 

 time to spare on any of my visits to search for these, let 

 alone to work them. Along the southern shore of Dingle 

 Harbour there are small deposits, which appear to contain 



