28o The Irish Naturalist. 



Corbula gibba. Hydrobia uIvce. 



Ttochjis cinerareus^ Cerithium reticulatum. 



T. mag7is. Purpura lapillus. 



Littorina litorea'.^ ' ' Nassa reticulata. 



L. obtusata. • • P leurotovia turricula. 



Rissoa membyajiacca. 



Specimens of T. pullastra and C. exiguuvi occurred with the 

 valves in juxtaposition. 



On the eastern shore of lyOUgh Swilly at Fort Stewart ferry, 

 a couple of miles further south-west, an interesting raised 

 beach may be seen. At a ruined cottage a couple of hundred 

 yards north of the ferrj^ there is a la5^er of shells 4 feet above 

 high water, with shelly gravels above and below. Northward 

 the deposit rises up on the top of a bed of blue Boulder-clay 

 to a height of 12 feet above high tide. Southward it runs 

 level past the public-house, where it shows out as a great bed 

 of oyster shells, 10 feet above high water. Further south, the 

 Boulder-clay rises up again. In this raised beach the follow- 

 ing shells were seen, the first eleven being abundant — 



Ostrea ediilis. Tapes p^dlastra. 



Pecteji variiis. 'Telliiia bait hi ca. 



Mytilus edulis. Corbula gibba. 



Tapes aureus- Patella vulgata. 



T. d ecus sat us. Trochus ci7ierareus. 



Cardium exiguum. T. lineatus. 



C. edule. T. viagus. 



Mactra subtnmcata, Mu7'ex eriyiaceics. 



Littorina obtusata. Purpura lapilhis. 



L. lito7'ea. Buccimcvi undatuvi. 



Cerithium reticulatum. Nassa reticulata. 

 Anomia ephippium. 



The Ivimpets were remarkably elevated, the height being in 

 some cases /^ of the greatest breadth. The occurrence of 

 TrocJms lineatus here is interesting, as its present range in 

 Ireland does not extend further north than Bundoran on the 

 west coast, and Ballywalter on the east coast. The late Canon 

 Grainger used to tell me a curious story of some sailors who 

 collected a number of these shells in mistake for Periwinkles 

 at some place on the west coast, and brought them alive in 

 their vessel to I,ough Swilly, where, finding them unpalatable. 



