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 lip 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 



m, 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 /ce^aX^, (cephale) a head : and 

 those without a head Mollusca acephala, 

 from the Greek a (a) without, and /ce^aX?j . 

 Muricated. Having little pointed knobs ; from 

 murex, the sharp point of a rock. 



