SOPPITT AND CARTER : UPPER AIREDALE MOLLUSCA. 93 



UNIONID^. 



Unio tumidus Phil. By no means a common species. Dead 

 shells in canal at Gilstead near Bingley, and at Thackley. 

 Living examples, river Aire at Steeton (J. Ellison). 



Var. radiata Jeff. Canal near Silsden (J. Ellison). 



Var. ponderosa Pascal. River Aire, Steeton (J. Ellison). 



Var. arcuata Bouch. River Aire, Steeton (J. Ellison). 

 Unio pictorum L. Rare. One dead shell, canal near Bingley, 

 1886; one ditto from canal dredgings between Apperley and 

 Calverley. Living examples from the Aire near Steeton 

 (J. EUison). 



Var. deshayesii Rossm. River Aire near Steeton (J. EUison). 

 This variety — as we are informed by Mr. George Roberts — was 

 recorded and described by Brown from the river Aire, Keighley, 

 in 1845, as Unio deshayesii. 

 Anodonta cygnea L. Common in suitable localities. Rawson's 

 Mill Dam, Bradford Moor, 1869 or 1870, several very, fine speci- 

 mens (Dr. Evans). Pond on Bradford Moor, 1882. Dead 

 examples, canal dredgings, Saltaire and near Calverley. Canal 

 near Steeton (J. Ellison). 



Var. incrassata Shepp. Canal dredgings between Apperley 

 and Calverley, 1887. 



Var. zellensis Gmel. Canal dredgings between Apperley and 

 Calverley, 1887. A form partaking of characters of two latter 

 varieties from river Aire, Steeton (J. Ellison). 



Var. rostrata Rossm. In mud of pond near Garnett's ]\Iill, 

 Bradford, abundant, about one-fourth of them being remarkable 

 in having a curious incurvature of the basal margins of both 

 valves. Dredge heap, Apperley. 



Var. stagnalis. Dredge heap, Apperley 



VAR.avonensis Mat. & Rack. nonMont. Several living examples, 



canal between Calverley and Apperley. 

 Var. intermedia Brown non Lamarck. Greengates, near 



Apperley. 



Anodonta anatina L. Frequent. Leeds and Liverpool Canal, 



Bingley and Calverley. Steeton (J. Ellison). 

 Var, radiata Jeff. Canal dredgings near Calverley. 

 Var. complanata Rossm. River Aire near Steeton (J. Ellison). 



Common in canal between Apperley and Calverley, 1S87. 



Canal dredgings near Calverley. 

 Var. arelatensis Jacq. Canal at Gilstead, 18S6. 



April 1888. G 



