260 TREGELLES : MARINE MOLLUSCA OF CORNWALL. 
fathoms, and Helford (W.H.); Maenporth (R.N.D.) ; 
Mount’s Bay (Penz. list) ; Hayle (R.N.D.). 
Ensis ensis L. [Sole e.].—Whitsand Bay E., Mount’s Bay, 
Falmouth, Helford, Padstow. 
E. siliqua L.—Generally distributed. 
Siliqua pellucida Penn.—S.E. Cornwall, Falmouth, Mount’s 
Bay—abundant, Hayle, Scilly—numerous. 
Saxicava rugosa L..—Plymouth, deep water off the Deadman, 
Mount’s Bay, Falmouth, Helford, Porthcurnow, Scilly. 
Var. arctica L.—Plymouth, Falmouth, Mount’s Bay, Porth- 
curnow, off Land’s End, Scilly. 
Var. preecisa Mont.—Common on rocks at low-water mark, 
attached to roots of coralline by the aid of a byssus (J.C.). 
Var. cylindrica S. Wood.—Land’s End (J.T.M.). 
Gastrochezena dubia Penn.—Taken from cavity of a stone 
from deep water (J.C.); Falmouth (W.H.); Penzance 
(Miss T.) ; Scilly, a single valve (R.W.J.S.). 
SuB-ORDER PHOLADACEA. 
Pholas dactylus L.— Plymouth (J.M.B.A.); near Fowey 
(J.C.) ; Falmouth (C.B.); Marazion (Millett); Penzance 
(E.D.M.) ; Hayle (Miss H.). 
P. (Barnea) candida L.—-Pridmouth (R.V.T.); Falmouth 
(W.H.) ; Mount’s Bay (Miss T.). 
P. parva Penn.—Plymouth (Bellamy); Pridmouth (J.C.) ; 
Falmouth (C.B.) ; Helford (W.H.); Penzance (E.D.M.). 
P. (Zirpheea) crispata L.—Plymouth (Bellamy) ; Falmouth 
(W.P.C.); Hayle (W.H.). 
Pholadidea papyracea Turt.— Plymouth (J.M.B.A.) ; 
Falmouth (W.H.) ; Hayle (Miss H.). 
Var. aborta Jeff—Numerous in reddish sandstone from 
deep water (J.C.) ; Falmouth (C.B.). 
Xylophaga dorsalis Turt. — Falmouth (Miss Vigurs) ; 
Lizard (Miss Carne) ; Scilly (R.W.J.S., C.B.). 
J.C., viii., Oct., 1896, 
