252 TREGELLES : MARINE MOLLUSCA OF CORNWALL. 
Modiola barbata L.—Falmouth (W.H.); Mount’s Bay 
(G.F.T.) ; Padstow (Enys) ; Scilly (R.W.J.S.). 
M. modiola L..—Plymouth Sound, Par, Falmouth, Helford, 
St. Minver, Scilly. 
M. adriatica Lmk.—Falmouth (Brown) ; Helford (R.N.D.) ; 
Mount’s Bay (Penz. List); Hayle (Miss H.); Scilly 
(R.W.J.S.). 
Var. ovalis Sow.—Falmouth (G.F.T.) ; Scilly (R.W.J.S.). 
M. phaseolina Phil.—West Cornwall and Scilly. 
Modiolaria costulata Riss.—Falmouth, Helford, Penzance, 
Porthcurnow, Land’s End, Hayle, Scilly. 
M. marmorata Forbes.—Plymouth, Falmouth, Mount’s Bay, 
Porthcurnow, Land’s End, Hayle, Scilly. 
M. discors L.—Falmouth, Mount’s Bay, Porthcurnow, Wolf 
Rock, Scilly. 
Crenella (Rhomboidella) rhombea Berk.—Mount’s Bay 
(Penz. List) ; dredged 20 miles off Penzance (McAndrew); 
Land’s End (W.H.) ; Scilly (R.W.J.S.). 
ORDER PSEUDOLAMELLIBRANCHIATA. 
Avicula hirundo L.—Found by trawlers off the Eddystone. 
Mr. Hockin records it as being taken off Falmouth (?) 
Pinna rudis L.—Occurs in beds off the S. coast in moderately 
deep water, the upturned edges of the valves being 
destructive to trawl nets. Off Plymouth, Deadman, Lizard, 
Land’s End, Hayle, and Scilly. 
Ostrea edulis L.—Generally distributed. It is cultivated in 
the Tamar, Falmouth Harbour, and Helford River. 
Var. parasitica Turt.—Common (J.C.). 
Var. deformis Lmk.—Hayle (Miss H.) ; Par (J.T.M.). 
Pecten maximus L.—Generally distributed. 
P. opercularis L.—Generally distributed. 
Var. lineata DaC.—Plymouth Sound, Falmouth, Helford, 
Mount’s Bay, Scilly. 
J.C., viii., Oct. 1896. 
