Mollusks. 4335 



Lymnaeus stagnalis. In the Darent, but more frequently in ditches 



near the river. In North Holland, and near the Maes, I have 



observed this shell attain a size quite unknown in British specimens. 



„ palustris. Frequent ; the var. with the violet-brown 



tinge in the throat occurs also. 



„ truncatulus. Stream near Kemsing ; rare. 

 „ glaber. Medway, near Maidstone. 

 Ancylus fluviatilis. Frequent, in a small stream near Kemsing, and 

 at Bradbourne. 



Velletia lacustris. Abundant, in two small .ponds in Knole Park, 

 on the dead leaves of oak, beech, &c. that have lain some time in the 

 water. 



Aplexus hypnorum. Slow stream near Kemsing; rare. 

 Physa fontinalis. Ditches near the Darent. I possess one speci- 

 men resembling the figure in Turton marked rivalis, very much 

 larger than ordinary. 

 Planorbis albus. The Darent ; rare. 



„ laevis. This local shell, which, as far as I am aware, has 



not previously been found in any south-eastern county, seems confined 

 to one locality here, the same stream that yielded me Aplexus hyp- 

 norum ; but there it is abundant. 



„ imbricatus. Plentiful, in a small pond near the " Grove ;" 



scarce elsewhere. 



„ marginatus. Common. 



„ vortex. Local. 



„ spirorbis. Common. 



„ contortus. Stream near Kemsing and near the Darent. 



„ nitidus. Ponds in Knole Park. 



Cyclostoma elegans. On the chalk, in extraordinary numbers, more 

 frequently without the dark markings. 

 Cyclas cornea. Very common. 



„ rivicola. Medway, near Maidstone ; found by H. Field, 

 Esq., jun. 



Pisidium nitidum. Not uncommon in one small pond near Wil- 

 dernesse Park. 



„ pusillum. Locally abundant. 

 „ pulchellum. Frequent in a stream near Kemsing. 

 „ amnicum. In the Darent. 

 Anodon Cygneus. Abundant, in a pond at Fairlawn, and found in 

 the Darent. 



