BIVALVES MYTILUS. 71 



The M. discrepans, M. lingua, and M. aiborescens 

 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. 



MvTiXog (Mytilus) is the name given to this genus 

 by the antient naturalists. 



Division l.^Shell oblong, umbones or apices terminal and point- 

 ed, slighthj angulated at one side, and rounded at the lower 

 margin. 



Scientific Name. Locality. Common Name. 



Edulis Britain, Baltic, Indian seas Eatable Muscle 



Pellucidus Britain Pellucid • • do 



Vulgaris West Indies Small • • • • do 



Bilocularis Indian Ocean, Nicobar-' Two-celled do 



Uugulatus 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 



Confusus Wedge shap'ddo 



Bidens America, South Seas, Me- 

 diterranean, Magellan Double tooth'd do 



Puniceus Goree Ventricose do • • 



Demissus Carolina, North America Silvery do • • 



Ruber Southern Ocean Red do • • 



Division II. — Transversely ovate, with longitudinal ribs on each 

 side, and plain or striated in the middle. 



Discrepans Baltic, Britain Compartment do 



Discors Norway, Britain Discordant do • • 



Irapactus New Zealand Woolcoated do • • 



