l6 NELSON AND TAYLOR : ON YORKSHIRE MOLLUSCA. 



Genus ANODONTA, Lamarck. 



Anodonta cygnea, (L.) 



Anodonta fluviatilis, Lea ! 

 Ancdonta implicata, Say. 



Dr. Gwyn Jeffreys regards A. fliiviaf'dis, Lea, as synonymous 



with A, cygnea, L., a view with which v.'c agree. I'he A. implicata^ 



Say, he also thinks is a variety. 



4. Huinber — Goole, R.W.M., Selby Canal, LLF.?., Moat of Cawood 

 Castle, H.F.P. 



7. Went /a/e— Nostell, C.A., Ilemswortli Reservoir, C.A., Bentley ! 



Campsall Park, J.C, River Went, ].\\hA 



8. Dearne — Earnsley Canal ! 



12. Lower Cac/e/-— New Miller Dam, J.W. Wakefield and Barnsley Canal! 



13. Airedale — Canal, Armley ! Rodley ! Killingbeck, nr. Leeds ! Shepherd's 



Pond, Camp Road, Leeds! Ilalton ! Roundhay Park! 



22. Derivent — Scarbro', W.T3. 



24. Ho.'derncss — Hornsea Mere, T-L>."B., Leven Canal, J.D.B., Barmston 

 Drain, J.D.B., Risky Park Pond, fine, J.D.I?. 



Var. incrassata, (Sheppard). 

 7. Went t'a/e— Nostel, J.C. 

 22. Derwent — Scarbro', W.B. 



Var. Zeilensis, (Gniehn) 



10. Colne — Abundant at Elland, J.Wh. 

 22. Derwent — Scarbro', W.B. 



Anodonta anatina, (L.) 

 This form is, according to many conchologists, only a variety 

 of A. cygnea, L., the variability of that species being notoriously 

 great. 



4. H umber— Goole, R.W^M. 

 8. Dearne — Canal, Barnsley, J.IL 

 22. Derwent — Scarbro', W'.B. 

 24. Holderness — Hornsea Mere, J.D.B. 



Var. radiata, (Miill.) 

 8. Dearne — Canal, Barnsley, J.IL 



Var. ventricosa, C. Pfr. 

 22. Derwent — Scarbro', W.B. 



Tr.Kns.V.N.U,, 1877, Series C 



