343, 
344, 
345, 
Var. 
THE MOLLUSCA OF DORSETSHIRE. 89 
Order MYACEA. 
MYIDA. 
MYA, L. 
M. arenaria, L. 
Pulteney, p. 28, pl. 4, f. 2. 
A broad, thick, semi-transparent shell gaping at both 
extremities. Lives near low-water mark or near estuaries. 
Weymouth, thrown on the shore after gales, W. Thompson. 
Poole Harbour, taken alive buried in weed. 
Fossil : Pliocene. 
M. truncata, L. 
Pulteney, p. 27, pl. 3, f. 1. 
A deep-sea shell as well as littoral. 
Weymouth, W. Thompson. 
Poole, sand-banks, Dr. Turner. 
Between South Haven and Studland, single valves, 
abundantly strewed on the beach, J. C. M.-P. 
Fossil: Coralline Crag and Boulder Clay at Whitby. 
CORBULA, Brug., 1792. 
C. gibba, Olie. 
Forbes and Hanley, Vol. i., p. 180, pl. 9, f. 7-12. 
This shell usually frequents the Laminarian Zone, and is 
abundant round the coast. 
Portland, West Bay, dredged 15 fathoms, Lieutenant 
Thomas, R.N. 
Weymouth Bay and mouth of the Fleet, abundant, 
E. R. Sykes. 
Poole, back of Hook, Dr. Turner. 
Between South Haven and Studland, J. £. Cooper. 
Kimmeridge Bay, muddy sea-bottom, dredged, J. C. M.-P. 
West Bexington, dredged seven fathoms, J. C. J.-P. 
rosea, Jeff. 
Weymouth, McAndrew ; Damon. 
Fossil: Red and Coralline Crags. 
