120 



PEOP. T. M'KENNY HUGHES 



Ostrea edulis, Linn 



Mytilus edulis, Linn , 



(Modiola) modiolus, Linn.... 



ISTucula nucleus, Linn 



Pectuncuius glycymeris, Linn. . . 



Cardium ecbinatum, Ldnn 



edule. Li7in , 



Cyprina island! ca, LAnn 



Astarte borealis, Cliemn 



sulcata, Da Costa 



sulcata, var. elliptica 



Artemis exoleta, Linn 



lincta. Putt 



Venus gallina, Linn , 



Tapes, sp , 



Tellina baltbica=^ solid ula 



Psammobia ferroensis, Che ran. ... 



Donax anatinus, Lamk , 



Mactra solida, Linn 



solida, var. elliptica = ovalis 



Corbuia gibba, Olivi 



Mya truncata, Linn 



Dentalium, sp 



Fissurella grsca, Linn 



Littorina littorea, Linn 



obtusata, Linn 



Turritella terebra, Linn 



Purpura lapillus, Linn 



Buccinum uudatum, Linn 



Murex erinaceus, Linn 



Trophon clathratus, Linn 



truncatiis, Strom 



Fusus antiquus, Linn 



Nassa reticulata, Linn 



Pleurotoma ruf a, Mont 



turricula, Mont 



Balanus, sp 



Cliona 





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III. 



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V. 



All these are recorded by Gwyn Jeffreys as now occurring on the 

 coast of the British Isles, except Astarte borealis, of which only dead 

 and, possibly, derived shells have been found. AU except Pecten 

 varius and Fissurella grceca have been found in the marine drift of 

 St. Asaph and Colwyn ; and the two exceptions go for nothing, as 

 these shells are common on our coast at the present day. 



There is only the Astarte borealis which is locally extinct, and it 

 occurs in the high and low marine terraces, from Moel Tryfan to 



