BIVALVES. xMYA. 29 



Some species of the Mya inhabit the East Indian seas; 

 others are found on the coast of Africa; several are 

 common in the European and Northern seas; and some 

 species are to be found in the South seas; they also oc- 

 cur in considerable abundance in the neighbourhood of 

 Sheerness and Sandgate Creek. 



UYX-^Gaper. 



* Truncata. — Trunca ted. Nicobarica. — Nico bar. 



*Declivis. — Sloping. Australis. — South Sea. 



♦Arenaria. — Sa7id. Gaditana. — Cadiz. 



♦Pictorum. — Painter^ s. Corrugata. — Wrinkled. 



♦Margaritifera. — Pearl. Rugosa. — Rough. 



Aurita. — Eared. Nodosa. — Knobbed. 



Perna. — Smooth. Norwegica. — Norwegian. 



Vulsella. — Tweezer. Spuria. — Spurious. 



Arctica. — Arctic. Glycimeris. — Great. 



Edentula. — Toothless., Syrmatophora. — Angular. 



Radiata. — Radiated. Nitida. — Glossy. 



Oblonga. — Oblong. Meinbranacea. — Membranceous. 



Anatina. — Duck. Byssifera. — Bearded. 

 *Dubia. — Dubious. 



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 into the opposite valve. 



Although the number of species in this genus is but few, 

 viz. twenty-four, yet their form and general appear- 

 ance are exceedingly varied. 



