120 



streams. It is singular that neither this nor Succinea 

 putris is found in water, although always in the neigh- 

 bourhood of it; and even wben placed iu water it can- 

 not be readily drowned. 



In Nottinghamshire, found at Beeston, Highfield 

 House, Radford Grove, Stanion-on-the- Wolds, Bulwell, 

 Wollaton, and Sawley. 



There are several varieties, too indistinct in character 

 to be described. 



We are deficient of the only other British species, 

 Succinea oblonga, which is a rare shell. It is found 

 near Swansea, Glasgow, and in Berwickshire. 



LiMNCEADE. 



A numerous family of fresh-water snails, having short 

 stout heads, with a pair of tentacles, which are usually 

 large and triangular in form. 



The branches of this family are pulmoniferous. 



The form of tbe shell varies from spiral to even 

 patelliform 



An inhabitant chiefly of still and slow streams, be- 

 coming less abundant and at the same time smaller in 

 size in the more rapid currents. 



The eggs are deposited within a pellucid mass of a 

 gelatinous substance, and are secured to stones or sub- 

 merged leaves and stems of aquatic plants. 



Physa. 



Fragile, spiral, smooth, shining, lengthened or glo- 

 bose shells. 



