BIVALVES——MYTILUS. 
Division I1.—Found burrowed in rocks, corals, §c. 
Scientific Name. 
Lithophagus -- -- 
Aristatus----.. + 
Ambiguus 
Rugosus 
ereeeree 
Coralliophagus - - 
Preecisus -+-+++-> 
Arborescens ---- 
eoeeseee 
Locality. Common Name. 
Indian, European, & Me- 
diterranean Seas .... ++ Burrowing M. - 
Senegal -++--+ sss eeee Crossbeak’d do -- 
Weymouth, Coast of De- 
vonshire +--+ eeeese Ambiguous do -+ 
Britain, Norway -------- Rugged -- do-- 
East & West Indies ---- Coral-piercer do 
Britains celeste ‘l'runcated+ do -- 
Kast Indies --++---+++-- Brown «+--+ do -+ 
Nicobar Isles -+------++ Plaited ---- do -- 
Ditto s+ -+-e re eee eee eee Snow white do -- 
China, St. Domingo ---- Dendritical do -- 
Division [V.—Shell oblong, gibbous, with the posterior side dilat- 
ed and elevated above the hinge, apex rounded. 
Modiolus 
eoawere 
Britain, W. Indies, Africa Great ---- do- 
Division V.—Only found in fresh water. 
Cygneus 
Fluviatilis --..-.- 
Stagnalis 
Anatinus:-...... 
Fucatus 
Dubius 
* Americanus -- -« 
eeeoreve 
eoeteee os 
Europe obigodeaoopoaads On Swan a ahs) 6 
North America -:- River +--+. do -- 
Lake of Schwansee:: ---- Stagnant -- do - 
Europe slafeletatetetovelsNelehoieriis Duck ier aorus 
Wiltshire, North America Avon ----> do - 
Senegal, China --->-+--- Doubtful -- do - 
North America ------+-- American:+ do 
