142 THE ELEMENTS 



Bidented, having two teeth. 



Bifarious, parting in opposite direc- 

 tions. 



Bifid, opening with a cleft. 



Bilahiate, furnished both with an 

 outer and inner hp. 



Bilobate, divided into two lobes. 



Bimarginate, furnished with a double 

 margin as far as the lip. 



Biradiate, consisting of two rays. 



Bivalve, consisting of two valves or 

 divisions. 



Blotched, spotted in an irregular way. 



Blunt, obtuse, opposite to acute. 



Blush, of a red colour. 



Borer, a piercer. 



Brinded, streaked. 



Bulorinff, gibbous, swollen out. 



Bullate, of a blistered appearance. 



Bunt, an increasing cavity, a tunnel. 



Byssus, a beard, common in the 

 Mytilus and Pinna. 



