31 



Tomochiton (Traehydepmon) marg-inatus, Penn. 



Redcar (W. C. H.), Saltburn, comuion (M L. T.), 

 Staithes (J. H.). 



Anisochiton (Acanthochiton) fascieularis, L. Redcar 



(W. C. H). 

 Dentalium (Entalis) entalis, L. Saltburn, four (M. L. T.). 



Anomia ephippium, L. Saltburn, common (M. L. T.). 



Anomia patellifOPmis, L. Redcar (D. F.). Alder says 

 " The Oafrea striata of British Authors, first noticed 

 by Lister, as common upon the sands at the Mouth of 

 the Tees, we take to be this species." 



Peeten maximus, L Off Redcar. "Deep water fishing, 

 rare " (D. F. ). 



Peeten pusiO, L. Redcar (W. C. H.), Saltburn |M. L. T.). 



Chlamys varius, L. Redcar (W. C. H ). " Under stones 

 on East and West Scars " (D. F.). 



Chlamys (.ffiquipeeten) opercularis. L. Redcar (W. C. 



H ). Oif Redcar. " Sometimes washed up on the Tees 

 Sands after a heavj' storm, and occasionally brought in by 

 the fishermen " (D. F.), Saltburn (M. L. T.). 



Mytilus edulis, L. Staithes (J. H.), Redcar (D. F ) (J. H.), 

 Saltburn, common (M. L. T.). 



Modiola modiolus, L. Redcar (W. C H.), off Redcar 

 (D. F.), Saltburn (M. L. T.). 



Modiola barbata, L. Staithes (Arnold T. Watson). 



Modiolaria discors, L. Redcar. '• At the roots of sea- 

 weeds between tide marks " (D. F.). 

 Modiolaria nigra, Gray, off Redcar (D. F ). 



Dreissensia polymorpha, Pallas. Mr. T. A Lofthouse 



has seen specimens that had been taken on drift wood in 

 the Tees at Newport. 



Mapg-aritana mapgaritfepa, L. Lealholm (T. A. L), 



River Esk (Dixon and Watson). 

 Anodonta cygnea, L. I have full grown specimens from 

 the collectiun of the late J. Watson, of Ingleby Greenhow, 

 which were obtained from Stokesley Mill Dam about 

 1857. Mr. T. A. Lofthouse has obtained small specimens 

 from streams near Great Ay ton and Stokesley. 



AstaPte sulcata, Da Cos. 0& Redcar (D. F.). 



