AND THEIR INHABITANTS. 189 



mon may be mentioned the Fringed Water-lily ( Vil- 

 larsia nymphaoides), the intermediate Bladder-wort 

 ( Utricularia intermedia), the Water Violet (Hottonia 

 palustris), the Brook Weed or Water Pimpernel (Sa- 

 molus Valerandi), the White and Yellow Water-lilies 

 (Nymphea alba and Nymph ea luted). The number 

 of plants found in the vicinity of the river is greater 

 than that I ever found in one locality, not less than 

 300 species. The number of insects also is very great; 

 the number of species obtained during two years' 

 collecting not being less than 700, and these by one 

 collector. The fresh-water shells of the Ouse and of 

 the brooks that run into it are very numerous, such as 

 Limnea stagnalis, L.pereger, L. palustris, L. glaber, and 

 two other species; Planorbis corneus ; Carinatus, vor- 

 tex, nitidus, albus, and nautilus ; Bythinia tentaculata, 

 (and Leachii, lower down the river in a ditch) ; Cyclas 

 cornea and rivicola ; Paludina vivipera ; Pisidium, two 

 species ; of Sucdnea two species, Unio pictorum and 

 ovalis; Anodonta cygnea; in truth, nearly all the British 

 land and fresh-water shells. 



No better place for the naturalist to study botany, 

 land and fresh-water shells, and entomology, can be 

 found than Lewes. A little geology may be studied 

 in the chalk quarries and features of the country. 



The Medway rises near East Grinstead, in the south- 

 east of Surrey, and flows through the centre of Kent, 

 past the towns of Maidstone, Rochester, and Chatham. 

 It is, perhaps, the most beautiful river of our south- 

 eastern counties, and at one time greatly abounded in 

 fish, which lurked in its deep black waters ; but the 

 numerous paper-mills, by discharging water contami- 



