OF CONCHOLOGT. 151 



Fragil, brittle, easily broken. 



Front, in univalves, when the aperture 

 is turned towards the observer. 



Furcated, forked. 



Furrow, a small trench or hollow. 



Fuscated, darkened, obscured. 



Fusiform, spindle-shaped, intermedi- 

 ate between the conical and oval. 

 G. 



Gap, an opening, in multivalves and 

 bivalves when the valves are shut 

 as in the Pholades, Myw, &c. 



Geminated, marked with a double ele- 

 vated stfise connecting the wreaths. 



Genus, a distinct division or tribe of 

 any class, which may comprehend 

 many species, or individuals, agree- 

 ing in their generic character. 



Genera, the plural of genus. 



Generic description, consists of an 

 accurate description of the parts 

 composing a shell, and all the shells, 

 whose essential parts agree with this 



