56 SYNOPTIC KEY 



Labium: The "lower lip" of an insect, which may be greatly 

 modified in different forms but is typically developed in the 

 grasshopper. 



Lamellate: Leaflike. 



Labrum: The "upper lip" of an insect which is typically developed 

 in the grasshopper. 



Lanceolate: Lance-shaped, i.e., long, narrow, and pointed. 



Larvae: A young stage in the life-history of an animal which does 

 not closely resemble the adult; here used in the case of insects 

 to designate the wormlike young of forms having a complete 

 metamorphosis. 



Lithocyst: A small globular structure containing one or more 

 solid particles, frequently supposed to be concerned with 

 equilibrium. 



Lophophore: The horseshoe-shaped set of tentacles of a brj'-ozoan. 



Lorica: The outer shell around some rotifers and protozoa. 



Lung books: A method of respiration in spiders by which the 

 air is introduced between the "pages" of a bookhke structure. 



Mandibles: Chewing organs, jaws, sometimes modified into pier- 

 cing organs. 



Manubrium: A projection from the underside of a medusa, which 

 bears the mouth. 



Marine: Living in the sea. 



Maxillae: Accessory jaws lying near the mandibles, typically 

 developed in the crayfish and grasshopper. 



Maxillipeds: Anterior thoracic appendages of crustaceans which 

 have been developed as accessory mouth parts. 



Medusae: Jellyfish. 



Membranellae: Membrane-like structures formed by the fusion 

 of cilia. 



Mesothorax: The median part of the thorax of insects, typically 

 bearing the median legs and the anterior pair of wings. 



