HARGREAVKS : MARINE MOI.I.USCA OF YORKSHIRE COAST. 83 



Of late years has several times been recorded for the Yorkshire 

 coast, but in every case where I have been able to see the specimens 

 they have proved to be V. modiolus. 



Volsella phaseolina (Philippi). — Scarborough (Bean). 



Modiolaria marmorata (Forbes). — Dogger Bank (Brady and 

 Parke) ; very large (L. & M.) ; Redcar, at roots of seaweed (D.F.). 



In numbers on Scarborough Pier when the trawlers land Pecten 

 opercularis. Ascidians in numbers are mixed with the Pectens, and 

 quite ten per cent, contain Modiolaria., generally 7nar//io?-afa, but 

 quite frequently discors, and very rarely Saxicava rugom. 



Modiolaria discors (Linne). — See M. marmorata. 



Scarborough (Bean); Cayton Bay, alive (Hannan); between 

 Withernsea and Hornsea (M.B.A.). 



Modiolaria discrepans (Leach). — Dogger Bank, to 45 fathoms 

 (Brady and otb.ers) ; dead shells off Staithes, 25 fathoms (Brady); 

 rare at Scarborough (Bean) ; in deep water opposite Hornsea; known 

 to fishermen as the " corduroy mussel." 



Crenella rhombea (Berkeley).— Scarborough (Bean). 



Crenella decussata (Montagu). — Scarborough (Bean, rare, 

 F. & H.); coast of Yorkshire (Jeff.). 



Ostrea edulis Linne. — Widely, but sparsely distributed. 

 var. parasitica Turton. — Scarborough (Bean). 



Pecten maximus (Linne). — Redcar, in deep water (D.F.) ; 

 only three alive during many years (Bean) ; very rarely brought in 

 alive by trawlers, valves trawled not uncommonly. 



Pecten pusio (Linne). — Dogger Bank (L. & M.) ; Redcar 

 (W.C.H.); Saltburn (M.L.T.); valves common, Sandsend (M.V.L.) ; 

 valves occasionally on rocks in both bays. Scarborough. 



Pecten varius (Linne). — Fairly common. 



Pecten opercularis (Linne).— Common. 



This species is brought into Scarborough harbour in large 

 quantities, for bait and for food, from localities varying from a {^\n 

 miles out to considerable distances. The fishermen consider it a 

 migratory " fish." 



var. lineata daCosta. — Dogger Bank (L. & M.); off Scarborough. 



Pecten tigerinus (Miiller). — Off Staithes ; Robin Hood's Bay, 

 27-30 fathoms (Brady); Scarborough (Sc. Mus.); in numbers in 

 stomachs of plaice, off Scarborough (M.B.A.); off Withernsea 

 (M.B.A.). 



Pecten striatus (JNTiiller). — Off Scarborough (Bean). 



Pecten similis (Laskey). — Single valve, Dogger Bank (Parke). 



Lima loscombi G. B. Sowerby. — Dogger Bank (L. & M.) ; 

 rare at Scarborough (Bean). 



Turtonia minuta (Fabricius). — Redcar (D.F.) ; common, alive, 



