156 THE ELEMENTS 



sometimes applied to lines of colour 

 only, at others to a grooved line. 

 Linear, composed of lines, being 



marked with lines. 

 Lineate, marked with lines. 

 Lip, the outer edge of the aperture 



of univalves. 

 Littoral, of or belonging to the shore. 

 Livid, discoloured, black and blue. 

 Lobated, rounded at the edges. 

 Loncritudinal, the leno^th of the shell 



from the apex to the base. 

 Lubricity, slipperiness, smoothness of 



surface. 

 Lunated, formed like a half moon. 

 Lunulated, crescent-shaped. 

 Lunule, a crescent-like mark or spot, 

 situated near the anterior and pos- 

 terior slopes in bivalve shells. 

 M. 

 Margin, the whole circumference or 



outline of the shell in bivalves. 

 Marginated, having a prominent mar<- 

 gin or border. 



