BIVALVES. 43 
Cyclads, inhabits the river Nile, and ranges from 
thence to Cashmere. It tenanted the estuaries 
and creeks of Central Europe during the Pleis- 
tocene period. It is associated, at Brammerton 
and Balcham, with extinct species of Rhinoceros, 
Hippopotamus, Mastodon, and Elephants. It is 
also found fossilized with living species of Cyclas 
and Pisidiwm, in the Pleistocene fresh-water 
marls, at Stutton, Grays, Ilford, and Erith. 
