The localities in this neighbourhood (in all of which 

 it is abundant) are, the lake at Highfield House, the 

 canal near Lenton, portions of the river Trent, the 

 canal near Beeston, a lake at Wollaton, and the river 

 Soar, at Thrumpton. 



It is found, in more distant places, in the London 

 Docks (Grey), Bridgewater Canal and the canal be- 

 tween Manchester and Hull (Brown), river Ouse, 

 Bromham, Bedfordshire (the Rev. J. J. Goodall), Glas- 

 gow (Grey), Dublin (Brown). 



An inhabitant of Germany, Holland, and Belgium, in 

 the rivers Wolga, Danube, Rhine, and Elbe, in the 

 Caspian Sea, and the Black Sea. 



As a fossil it is found in Transvlvania. 



Unionid(e. 



I have a difficult task before me in endeavouring to 

 describe this most varied class of British shells, for the 

 diversity of form is so great that doubtless the young 

 collector will be puzzled, and feel inclined to recognize 

 many varieties, when a more intimate knowledge of this 

 class will, in time, enable him to pronounce them as 

 only another form of the same shell. In giving a des- 

 cription of the Unio and Anodoota tribe, I shall con- 

 fine our delineation to the most permanent shape, at 

 the same time giving such remarks on the variation of 

 form as may seem requisite, in order to make this 

 beautiful class as intelligible as possible. 



Although, from a careful examination, my inclination 

 leads us to recognize, with Professor Forbes, but three 

 UnJos, and one Anodonta, yet other authors have been 

 willing to admit several more, and a lengthened inves- 



