72 Praeger — The Marine Shells 



Jeffreys says the breadth of his largest specimen, found in Skye by Edward 

 Forbes, is 2 J inches, and that 1 ■ 7 is the average breadth. 



var. perforans. Inhabits the forsaken burrows of Pholades, and chinks of 

 rocks. Common — Thompson (sub Pullastra perforans). 



var. oblong-a. " Bundoran, Co. Donegal (J.G.J.)" — Jeffreys. 



Tapes decussatus, Linne. 



There is no certain record of this generally common species having been 

 taken alive in our province. Thompson, referring to the whole of Ireland, 

 says (sub Pullastra decussata) " a common species", and in his " Report on 

 the Fauna of Ireland " (1843), he has a cross opposite its name in the "North 

 of Ireland" column, but he mentions no northerly locality. Jeffreys simply 

 says "shores of Ireland". Hyndman's only note is to the effect that it 

 occurs in the alluvial deposits, and is not now known to be living in Belfast 

 Lough ; neither he nor Dickie found even dead valves in their dredgings. 

 Miss Eichardson has found a specimen with the valves united, at Portrush, 

 but the shell looks old and worn. I have taken it alive at Carlingford, and it 

 is abundant on the coast of Co. Louth, but appears to stop short on the borders 

 of Ulster. 



lucinopsis undata, Pennant. 



Dead valves occasionally dredged by Hyndman in 6-90 fathoms in Belfast 

 Lough, and off Larne ; and Mr. Swanston has taken it off White Head with the 

 valves still united. Thompson gives "Belfast Bay" (sub Artemis wndata). 

 Miss Richardson has sent me a fresh and complete specimen from Portrush 

 sands, evidently but recently dead. Like the preceding species, this would 

 appear to be one of those shells which are dying out in the district, as, like it, 

 while it is very rare in a live state, it is to be found in profusion and of 

 large size in the post-tertiary clays in our estuaries. 



Tellina crassa, Pennant. 



Hyndman dredged a single living specimen on the Cod Bank, 3 miles north 

 of Isle of Muck, 20 fathoms, gravelly bottom. In a dead state it has occurred 

 in various localities, Strangford Lough included, in 10-30 fathoms — Thomp- 

 son, Hyndman, and Dickie. Single valves are thrown up by the tide at 

 Orlock Point, Co. Down, in some quantity — B.L1.P. 



Tellina Balthlca, Linne. 



Common between tide-marks on every shore. Sub T. solidula by the writers 

 quoted above. 



Tellina tenuis, Da Costa. 



A common gregarious species, living in sand about low water mark. " The 

 plaice in Belfast Bay feed very much on T. tenuis' 1 '' — Thompson. Dead 

 valves of both this species and the preceding dredged on the Turbot Bank, 

 25-30 fathoms, by Hyndman. 

 Tellina fabula, Gronovius. 



" Not uncommon on extensive sandy beaches, as Magilligan, W.T. Found 



