BIVALVES. — SOLEN. 



13 



&c. &c. They have a propensity to burrow in the sand 

 and mud, and are wholly or partially concealed therein. 

 They also frequent Algae, &c. adhering to them by a 

 byssus or beard. 



Some species of the Mya inhabit the East Indian seas; 

 others are found on the coast of Africa; and several are 

 common in the European and Northern seas; some spe- 

 cies are also to be found in the South seas. 



MYA. 



*Truncata. 



*Declivis. 



*Arenaria. 



*Pictorum. 



*Margaritifera. 



Perna. 



Vulsella. 



Arctica. 



Edentula. 



Radiata. 



Oblongai 



Anatina. 



Nicobarica. 



Australis. 



Gaditana. 



Corrugata. 



Rugosa. 



Nodosa. 



Norwegica. 



Spuria. 



Glycemeris. 



Syrmatophora. 



Nitida. 



Membranacea. 



Byssifera. 



*Dubia. 



SOLEN. — Razor-sheath or Knife-handle. 



Animal— an Ascidia: Shell bivalve, oblong, open at both 

 ends: hinge with a subulate reflected toothy often double, 

 and not inserted in the opposite valve. 



Although the number of species in this genus are but 



