BIVALVES. MY A. 



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. 



♦Truncata. — Truncated, 

 *Declivis. — Sloping. 



* Arenaria. — Sand. 

 *Pictorum. — Painter's. 



* M ar garitifera . — Pearl. 

 Aiirita. — Eared. 

 Perna. — Smooth. 

 Vulsella. — Tweezer. 

 Arctica. — Arctic. 

 Edentula. — Toothless., 

 Radlata. — Radiated. 

 Oblonga. — Oblong. 

 Anatina. — Duck. 



MYA — Gaper. 



Nicobarica. — Nicohar. 

 Australis. — South Sea, 

 Gaditana. — Cadiz. 

 Corrugata. — Wrinkled. 

 Rugosa. — Rough. 

 Nodosa. — Knobbed. 

 Norwegica. — Norwegian. 

 Spuria. — Spurious. 

 Glycimeris. — Great. 

 Syrmatophora. — Angular. 

 Nitida. — Glossy. 

 Membranacea. — Membranceous. 

 Byssifeia. — Bearded. 

 *Dubia. — Dubious. 



SOLEN. — Razor-sheath or Knife-handle. 



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

 ends ; hinge with a subulate reflected tooth, 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. 



