297. 
298, 
Var. 
THE MOLLUSCA OF DORSETSHIRE. 77 
Poole, Pulteney. 
Shore between Studland and South Haven, J. C. M.-P. 
Owing to the tough hinge-ligament the valves are usually 
found undetached. The specific name anatinus having 
been appropriated by Continental writers for the Mediter- 
ranean species, British conchologists have adopted 
Da Costa’s name vittatus. 
Fossil: Norwich Crag ; doubtfully in the Red Crag. 
D. politus (Polz.) 
This is one of the brightest-coloured shells of the British seas. 
Lives in sand near low-water-mark of spring tides, 
Weymouth, Damon. 
Whitenose, dredged, 5 fathoms (alive), Z. R. Sykes. 
Shore between South Haven and Studland, J. C. M.-P. 
Fossil: Coralline Crag. 
MACTRIDZE. 
MACTRA, L., 1767. 
M. subtruncata (Da Costa). 
Forbes and Hanley, Vol. i., p. 358, pl. 21, f. 8, and pl. 22, f. 2. 
Pulteney, p. 32, pl. 5, f. 10. 
Weymouth, dredged, 7 fathoms, Z. Forbes and McAndrew. 
Weymouth, Pulteney. 
Poole, sand-banks, Dr. Turner. 
Abundant on the shore between Studland and South Haven ; 
Studland Bay, dredged, J. C. M.-P. 
striata, Bro. 
Weymouth Bay, on the old oyster bed, £. R. Sykes. 
Fossil: Coralline and Red Crags; it survived through the 
Glacial Period. 
. M. stultorum, Z. 
Pulteney, p. 33, pl. 8, f. 3. 
Another abundant shell in the sandy districts of the coast. 
North shore, Poole; Weymouth, Pulteney. 
Weymouth Bay, large number thrown up alive on the shore 
after easterly gales, many tenanted by the pea crab (Pin- 
tharis pisum), W. Thompson. 
Abundant on the shore between South Haven and Studland, 
after a gale, J. C. M.-P. 
