164 THE ZOOLOGIST. 
which water flows. Specimens, however, have been procured 
from mud thrown out of a ditch in the level of the Arun between 
Burpham and Arundel.—B. It may sometimes be found on the 
submerged leaves of the yellow water lily, Nuphar lutea. This is 
the only freshwater species of the genus to be found in this 
country, although there are several marine forms which are also 
met with in braekish water. 
Fam. PALUDINIDZ. 
Paludina vivipara. Common Marsh-shell.— Occurs in the 
Arun.—B. 1 cannot help thinking that I have observed it in 
the ditches of the Pevensey level, and in the marsh-drains between 
Siddlesham and Selsea; but I have traversed so many marshes in 
different parts of the country that I may be mistaken as to these 
particular localities. I remember to have noticed this shell as 
common enough in some of the fen dykes of Cambridgeshire. 
Mr. W. Jeffery has recently informed me that Paludina vivipara 
occurs at Wisboro’ Green, and that during the summer of 1877 
he found it plentifully in a small stream which supplies a portion 
of the Wey and Arun Canal.—H. 
Bythinia tentaculata. The Tentacled Bythinia.— Mr. Gwyn 
Jeffreys has pointed out that, although the derivation of the word 
Bythinia would imply that these mollusks inhabit deeper water 
than others of the same family, such is not the case. They 
generally frequent small streams, canals, shallow ponds and 
ditches, where they lay their eggs in three long rows on stones, 
as well as on the stalks and leaves of water-plants. In appearance 
the shell is not unlike a miniature Paludina, but the animal is 
oviparous instead of ovo-viviparous, and sessile-eyed instead of 
stalk-eyed. It is abundant in still stagnant ditches in the levels 
of all the Sussex rivers. 
Bythinia Leachii. Leach’s Bythinia.— Of rarer occurrence. 
Has been met with in a few of the ditches of Henfield level, 
and at Kastbourne—B. Mr. Unwin includes it under the name 
ventricosa, Gray, as occurring at Lewes in ditches by the side of 
Kingston Road. 
Fam. VALVATID. 
Valwata piscinalis. Common Valve-shell.—In the ditches of 
Henfield level and at Eastbourne—B. Very common in ditches 
