88 JOURNAL OF CONCHOLOGY, VOL. I3, NO. 3, JULY, I9I6. 



Saxicavella plicata (Montagu). — Off Scarborough, an imperfect 



valve (Jeff.). 



Panopaea norvegica (Spengler). — Dogger Bank, sparingly 

 distributed and rarely brought up with the dredge (L. & M.) ; off the 

 coast of Yorkshire at about 30 fathoms (Jeff.); two at Redcar (D.F.) ; 

 brought into Scarborough by fishermen (Bean). I have had only 

 one complete specimen offered for many years though the older 

 fishermen know it. 



Saxicava rugosa (Linne). — Abundant; together with Pholas \i 

 is in such numbers that they must have a material effect on the 

 denudation of the coast. 



var. pholadis Linn^. — Dogger Bank (L. & M.). 



Saxicava arctica (Linne). — Dogger Bank (Parke, L. & M.) ; 

 common on roots of Laminaria digitata, Sandsend (M.V.L.); Scar- 

 borough, not uncommon. 



Barnea Candida (Linnd). — Tees mouth, common (M.L.T.); 

 common, alive in both bays, Scarborough ; in clay, Kilnsea Skerries 

 (T.P.). 



Zirphsea crispata (Linne). — Dogger Bank, valves, probably 

 drifted (L. & M.) ; Redcar (D.F. & J.H.); Saltburn, common 

 (M.L.T.); common, alive in both bays, Scarborough, and at Filey, 

 but not so numerous as the preceding species. Near the Brig large 

 specimens may be found. Both this and the preceding species select 

 the softer rocks in which to bore, whilst Saxicava may be found in 

 harder and more durable rocks. 



Xylophaga dorsalis (Turton). — In wood washed up at Saltburn 

 (D.F.); occasionally in both Scarborough bays in drifted timber 

 (Bean, Jeff, and others). 



Teredo norvegica Spengler. — Dredged in Tees mouth, 1889 

 (W. Y. Veitch). 



Teredo megotara Hanley. — On floating timber, Scarborough 

 (Jeff, and Bean). 



Teredo bipinnata Turton. — Scarborough (Bean, and Sowerby's 

 111. Index of British Shells). 



(Teredo fimbriata Jeff — Bean records Ter. paliiuilata,\^\v\z\\ is 

 possibly this species). 



Lyonsia norvegica (Chemnitz).— Dogger Bank (L. & M., Sc. 

 Mus.); Scarborough (Bean). 



Cochlodesma praetenue (Pulteney).— Dogger Bank (L. & M.) ; 

 Redcar (VV.C.H.); has been dredged at Scarborough (W.C.H.); 

 Scarborough (Bean). 



Thracia fragilis Pennant. — Scarborough, South Bay, young. 

 Occasionally good living specimens may be had from Filey Brig, 

 var. gracilis Jeff.— Dogger Bank, 40 fathoms (L. & M.). 



