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 Oyclas 
and Pisidium, in the Pleistocene fresh-water 
marls, at Stutton, Grays, Ilford, and Erith. 
