i893-] 



THE BRITISH NATURALIST. 



47 



Var. radiata, Moq. — The lake at Highfield House (Lowe). River 

 Trent at Marnham (Musson). 



Var curvirostris, Norm. — Lake at Highfield House (Lowe). Canal 

 at Wollaton (Musson). 



Var. ponderosus, Spitzi. — Very numerous in the lake at Qssington 

 some years'ago. I cannot say whether it is to be found there or not 

 since the clearing out. 



Genus Anodonta, Lam. 



. Anodonta cygnea, L.— Common, and widely distributed in rivers, 

 canals, and ponds throughout the county. 



Var. radiata, Mull. — River Trent at Marnham (Musson). 



Var. zellensis, Gmel. — In the lake at Clumber (Rimmer — " Land 

 and Fresh-Water Shells)." I have not found the variety in the lake ; 

 but in a large pond below the weir, over which the lake drains, it is, 

 or was, almost the only form found. 



Var. rostvata, Rosm.— Canal at Beeston (Lowe). 



Anodonta anatina, L. — Common in rivers and canals. 



Var. radiata, Jeff. — River Trent at Marnham. 



Family MYTILID^E (Dreissenidce). 

 Genus, Driessen^e, Van Ben. 



Dreissena polymorpha ,YdA\. — Plentiful in the canals near Nottingham. 

 I have seen the sides of one of the locks closely encrusted with the 

 shells. Also found in the river Soar, and rarely in the Trent. 



Class Gasteropoda. Order Pectinobranchiata . 



Family NERITID^E. 

 Genus Neritina, Lam. 



Neritina fluviatilus, L. — Common in the Trent and other rivers, as 

 well as in canals throughout the county. Probably this species has 

 spread of late years, as Mr. Lowe says " it may be classed amongst 

 our very local shells, being everywhere confined to certain limits," 

 although he enumerates five localities for it. 



Family PALUDIN IDiE. 

 Genus Viviparus, Montf. (= Paludina, Lam.) 



Viviparus contectus, Millet. — Mr. J. W. Taylor, in company with 

 Mr. W. D. Roebuck, obtained examples of this species on the northern 

 border of the county. It was afterwards (in uS66) found by Mr. 

 Musson and myself in some numbers, near Bawtry, on the Notting- 

 hamshire side of the Idle, and in ditches connected with that river. 



