BIVALVES——MYTILUS. 71 
The M. discrepans, M. lingua, and M. arborescens 
may be particularised as rare species. 
The Indian, Atlantic, American, and Northern oceans 
produce many species; some are also found in New 
Zealand, and in the Red, Mediterranean, and Russian seas. 
MoziAoc (Mytilus) is the name given to this genus 
by the antient naturalists. 
Diviston I.—Shell oblong, wumbones or apices terminal and pornt- 
ed, slightly angulated at one side, and rounded at the lower 
margin. 
Scientific Name. Locality. Common Name. 
Edulis ---.+-+.-- Britain, Baltic, Indianseas Eatable Muscle 
Pellucidus ----- - Britain ----+-+- +--+ eee Pellucid -- do -- 
Vulgaris ----+--- West Indies ----+---+--- Small ---- do- 
Bilocularis ----:- Indian Ocean, Nicobar-- Two-celled do -- 
Ungulatus ------ West Indies--+.----++--- Ox-hoof -- do -- 
Exustus -++++--- Jamaica, Tranquebar---- Rose color'd do - - 
Striatulus ------. Northern Ocean ----+++- Striated .-- do -- 
Niger ..--+++-+- West Coast of Africa-+-- Black ---- do -- 
Latus ---.....-- New Holland, China---- Broad ---- do -- 
Perna --+-++ +--+ Straits of Magellan------ Lengthen’d do -- 
Smaragdinus ---- Tranquebar, Guinea: -- -- Green ---- do -- 
Wonfususeersc c= ae | olske esi! wlescvele) -feleielesaiele\uie Wedge shap'd do 
Bidens-------++- America, South Seas, Me- 
diterranean, Magellan Double tooth’d do 
Puniceus -- -+- - Gorees ++ settee recess Ventricose do -- 
Demissus --++ -- Carolina, North America Silvery---- do -- 
Ruber -----+-++- Southern Ocean ----+--- Red -..---- do -- 
Division Ii.—T'ransversely ovate, with longitudinal ribs on each 
side, and plain or striated in the middle. 
Discrepans «+--+ - Baltic, Britain---------- Compartment do 
Discors ---+-+++- Norway, Britain -----+--- Discordant do -- 
Impactus-:++-+-- New Zealand --.------- Woolcoated do - 
