72 BIVALVES MYTILUS. 



Division III. — Found burrowed in rocks, corals, §r. 



Scientific Name. Locality. Common Name. 

 Lithophagus Indian, European, & Me- 

 diterranean Seas . . . - • Burrowing M. • 



Aristatus Senegal Crossbeak'd do • 



Ambiguus W^eymouth, Coast of De- 

 vonshire Ambiguous do • 



Rugosus Britain, Norway Rugged • • do • 



Coralliophagu*. • • East & West Indies • • • • Coral-piercer do 



Praecisus Britain Truncated- do • 



Fuscus East Indies Brown • • • • do • 



Plicatus Nicobar Isles • < Plaited • • • • do • 



Niveus Ditto Snow white do • 



Arboi'escens China, St. Domingo •••• Dendritical do • 



Division IV. — Shell oblonrj, gibboiis, with the posterior side dilat- 

 ed and elevated above the hinge, apex rounded. 



Modiolus Britain, W. Indies, Africa Great do • • 



Division V. — Only found in fresh water. 



Cygneus Europe Swan • • • • do 



Fluviatilis North America River • • • • do 



Stagnalis Lake of Schwansee Stagnant • • do 



Anatinus Europe Duck • • • • do 



Fucatus W^iltshire, North America Avon do 



Dubius Senegal, China • • • ■ Doubtful • • do 



*Americanus • • • • North America American • • do 



