66 
293, 
THE MOLLUSCA OF DORSETSHIRE. 
OSTREIDA. 
OSTREA, L. 
The genus Ostrea is distinct from the Pectinidce in the 
structure of its gills and by its resting on the left valve. 
0. edulis, ZL. 
Poole, within the harbour, shell pink (living), Dr. Turner. 
Fleet, Weymouth, abundant; planted in an _ oyster-bed, 
E.R. Sykes. 
Frequently met with in excavations of the Roman Period. 
Var. hippopus, Lamarck, Forbes and Hanley, Vol. ii., p. 307. 
Var. 
Var. 
Weymouth Bay, dredged, #. R. Sykes. 
In )873 a bed of this variety was discovered on the trawling- 
ground 15 miles south of Portland bill 
Poole, outside the Harbour, Dr. Turner. 
Kimmeridge Bay, dredged, deep water, J. C. M.-P. 
Fossil: Red Crag. Raised Beach, Portland, Prestwich. 
ANOMIIDA. 
ANOMIA, Z., 1767. 
Attached to oysters and other shells. They assume the form 
of the surfaces with which their growing margins are in 
contact. 
. A. ephippium, L. 
Pulteney, p. 28, pl. 11, f£. 3. Brit. Conch., Vol. ii, p. 33a. 
Weymouth, abundant, Damon. 
Sandy shore between South Haven and Studland, J. C. M.-P. 
Kimmeridge Bay, attached to stems and _ oyster-shells, 
JC. Mak: 
squamula, Z. Weymouth, round sea-weed stems, EL. 2. Sykes. 
aculeata, Will. Kimmeridge Bay, on a scallop the ridges of 
which were repeated on its shell, J. C. ML-P. 
The variations are due to the position it takes on the object 
to which it attaches itself 
Fossil : Coralline and Red Crags. 
