214 EXPLANATION OF TERMS. 



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. 



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 f0aX>? (cephale) a head; 

 and those without a head Mollusca ace- 

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



K<pa\ij. 



Muricated. Having little pointed knobs; from 

 murex, the sharp point of a rock. 



Marine. Belonging to the sea ; from mare, the 

 sea. 



Multilocular. Having several chambers, from 

 mult us, many, and locul urn, a little 

 chamber. 



Operculum or Lid. A plate or door, with which 

 some species close the aperture of their 

 shells, from oper ior, I cover. 



Orbicular. Quite round, or circular 



