SMART AND COOKE : MARINE SHELLS OF SCILLY. 29 1 



variety occurs abundantly in the neighbourhood of Pentle 

 Bay. 



C. Norvegicum Spengl. — Not uncommon alive on Pentle Bay 

 and St. Martin's Flats. 



Cyprina Islandica L. — Very young specimens only, Crow 

 Sound. 



Astarte sulcata DaCosta. — Rare ; from the deep water outside 

 Menavawr, two living specimens only were obtained, and 

 about a dozen single valves. 



A. triangularis Mont. — With A. sulcata, but very abundant; 

 smaller than usual. 



Circe minima Mont. — With A. triangularis, common, and 

 often finely marked. 



Venus exoleta L. — Exceedingly common in sandy bays 

 everywhere. 



V. lincta Pult. — St. Martin's Flats and Pentle Bay ; seldom 

 found alive. 



V. chione L. — Not uncommon in clean sand: St. Martin's 

 Flats and Pentle Bay, often very large and beautiful, living 

 at low water mark spring tides. This habitat is note- 

 worthy, as Jeffreys only gives it from sand in 12 — 25 fms. 



V. fasciata Da Costa. — Common in sand at low water mark, 

 Pentle Bay, St. Helens, etc. ; also dredged in 40 fms. 

 gravel, outside Menavawr. Shore specimens are always 

 very thick, ribs broad and obscure ; dredged specimens 

 much flatter and cleaner cut, ribs sharp and more 

 numerous. 



V. fasciata var. radiata DaCosta. — Several fine specimens 

 from the deep water dredgings, also littoral. 



V. casina L. — Common at the north end of Pentle Bay, living 

 in clean sand at low water mark, also on St. Martin's Flats, 

 and between Tresco and Bryher. Here again the habitat 

 is worth notice, Jeffreys only giving 5 — 90 fms. 



V. verrucosa L. — Found occasionally in the sandy bays, but 

 never common. 



