BUTTERELL I MOLLUSCA OF HuLL AND ViCINITY. 71 



P. nitidum. Common, Spring Dyke, Skiclby Drain, and Kejingham 

 Drain. 



Anodonta cygnea. Risby Park pond, Hornsea Mere ; empty shells 

 in Leven Canal and Barmston Drain ; rather fine at Risby. 



A. anatina. Hornsea Mere. 

 Neritina fluviatilis. Barmston Drain. 



Bythinia tentaculata. Common in almost eveiy pond and ditch in 

 the district. 



B. Leachii. Barmston Drain. 



Hydrobia ventrosa. Very plentiful in drains near the Humber, 



between Brough and Market Weighton Canal. 

 Yalvata piscinalis. Skidby Drain, Leven Canal, 

 y. cristata.- Attached to caddis-cases in Leven Canal. 

 Planorbis nautileus. Pond near Springhead. 

 P. nautileus, var. cristata. Do. 

 P. albus. Welton Dale, Leven Canal. 



P. spirorbis. Common • in some parts of Spring Dyke th« water is 



quite brown with their floating shells. 

 P. vortex. Not so common as the last species : Spring Dyke, 



Beverley, Brantingham. 

 P. carinatus. Bevei'ley, Leven Canal. 

 P. complanatus. Common. 



P. corneus. Generally distributed ; very plentiful in Spring Dyke. 



P. contortus. Found with the last. 



Physa hypnorum. Anlaby Road, Beverley Road. 



P. fontinalis. Common. 



Lymnsea peregra. Very common ; fine in a pond at the entrance 



to Welton Dale, and in Leven Canal. 

 L. stagnalis. Beverley, Cottingham Road; fine in Spring Dyke. 

 L. palustris. Spring Dyke, Beverley, Hornsea. 



L. truncatula. Barmston Drain ; Hessle — in stagnant water in a 



lime quarry, fine • Brantingham. 

 L. truncatula, mr. minor. Hessle Road, 

 Ancylus lacustris. Leven Canal. 

 Arion ater. Very common. 

 A. hortensis. do. 

 Limax Sowerbyii (?) In gardens, Hull. 

 L. flavus. Hornsea. 

 L. agrestis. Very common. 



L. maximus. Common in Hull gardens ; Hornsea,, 

 Succinea putris. Very common. 



