OP CONCHOLOGY. 155 



Lacunose, having the surface covered 



with small pits. 

 Lamillated, divided into distinct plaits 



or foliations. 

 Laminae, thin plaits, one coat laid 



over another. 

 Lanceolate, oblong, and gradually ta- 

 pering to each end like the head of 



a lance. 

 Lateral, extending to one side, from 



the centre. 

 Lapideous, stony, of the nature of 



stones. 

 Latticed, having longitudinal lines or 



furrows, decussate by transverse 



ones. 

 Lenticular, doubly convex, of the form 



of a lens. 

 Ligament, the membranaceous sub- 

 stance which connects the valves 



together. 

 Limb, the circumference of the valves, 



within or behind the margin. 

 Line, a longitudinal extension, it is 



