EXPLANATION OF TERMS. 223 



Laminated. Having thin layers or scales called 

 laminae. 



Linear. Having the character of a line ; ex- 

 tremely narrow in proportion to its 

 breadth, and of nearly equal diameter 

 throughout. 



Length. In Bivalves, the dimension extending 

 from the hinge to the opposite margin ; 

 in Univalves, that from the apex to the 

 base. 



Ligament. A cartilage which connects the 

 valves ; from lig are, to bind. 



Lanceolate. Shaped like the head of a lance. 



Lips. The margins of the mouth of a univalve 

 shell. The columellar lip is the margin 

 nearest the columella. The outer Up is 

 the outer margin of the aperture. 



Locomotion. The power of moving voluntarily 

 from place to place ; from loc us, place, 

 and motion. 



Lubricated. Slippery ; having a very smooth 

 surface ; from lubric us, slippery. 



Multivalve. Having several valves, from 

 mult us, many. 



Mollusca. The animals inhabiting shells ; the 

 name is derived from mollis, soft. They 

 are divided into two classes : those which 

 have a head called Mollusca Cephala, 

 from the Greek ice^aX^, (cephale) a head ; 

 and those without a head Mollusca ace- 

 phala, from the Greek a (a) without, and 



