ORDER BIMU.-CULOSA. 



85 



The Wedge-Shaped Donah, (J^onax ciineata.) 



There are nearly thirty species of Donax, all extremely 

 beautiful ; that represented in the engraving is of a 

 whitish colour with red streaks : it is often met with in 

 collections of Indian shells. One of these species is 

 found on the English coasts, of a delicate white colour, 

 and streaked with pink. 



Bonax cinicafa. 



In following the system of Lamarck, we are gradually 

 led through various genera to two species figured on the 

 next page, namely, the Tellina, or earth-shell, and the 

 Pandora, and, ultimatelv, to the Solen, or razor-shell. 



The Sheath Solen, (Solen vagina.) 



The Solens are singular from the power they possess of 

 burying themselves in the sands on the coast, sometimes 

 even to the depth of a couple of feet. The foot of the 

 Solen, by means of which it is able to penetrate the 

 sand, is equal to one-half of the length of the shell. 

 Their movements are confined to rising to the surface 

 of the sand in which they have formed their hole, and 



