CHAP V. 



GENERIC CHARACTER OF BIVALVES, 



WITH A 



Description of their Component Parts. 



Q. I FIND the terms used in describing Bivalves 

 very difficult to understand ; will you have the 

 goodness to explain them to me ? 



A. Most willingly, if you will state them one 

 by one. 



Q. From what are the generic characters of 

 Bivalves derived ? 



A. Generally from the hinge. 



Q. From what the specific ? 



A. From the colour, form, or decorations of 

 the shells. 



Q. How are varieties formed? 



A. From accidental variations in the tints or 

 forms of shells. 



Q. Have the goodness to explain the term 

 B 



