OF CONCHOLOGY. 4? 



ORDER SECOND. 



BIVALVE SHELLS. 



Genus 4th. — MYA. Animal an As- 

 cidia ; shell bivalve, generally gaping 

 at one end ; hinge with broad, thick, 

 strong, patulous tooth, seldom more 

 than one, and not inserted in the oppo- 

 site valve. Linn. Syst. 303. Plate 5th, 

 %. 4th. 



Habitation. The Mya3 are to be 

 found both in the sea and in rivers. 

 The marine kinds generally live under 

 sand or sludge, and the place where 

 they lie is betrayed by a small hole, 

 out of which they occasionally protude 

 their proboscis. Those which inhabit 

 rivers, are generally found in the mud 

 at its bottom. In some places the 

 animals are used for food ; but what 

 makes them of considerable import- 



