SOLENACEA. MYARIA. MACTHACEA. 47 



" Solenacea includes 



Solen Solen. 



Panopcea Mya. 



Glycimeris Mya, 



'' The Solen is furmshed with a muscle, called 

 by some writers a tongue. By the aid of this in- 

 strument they descend two feet deep in the sand. 

 The tongue is first projected from the shell, and 

 cuts a hole. It then assumes the form of a hook, 

 and draws down the shell into the hole. This 

 operation is repeated until the shell disappears. 

 Panopcea is a large shell — it is in the Mu- 

 seum. 



" 4th Family, My aria. 



Mya Mya, or gaper. 



Anatina Mya. 



"The animal o^ Mya has also a foot : it buries 

 itself in the sand. You know the broad tooth 

 of the Mya genus. Anatina has a tooth on 

 each valve. 



" Second Section contains four families. 



" Mactracea has the following genera : 



Lutraria Mactra. 



Mactra Mactra. 



