280 GLOSSARY. 



Instinct. An inherent cause of doing not depending on memory 

 or observation. "Inherited memory." 



Intercalary (Huxley). When intermediate forms " do not repre- 

 sent the actual passage from one group to another." 



Intercentra. Spaces between the centra of the vertebrae. 



Ischiopodite. The third joint in the leg of a Crustacean. 



Kainoz&ic. See Cainozoic. 



Keratode. See Ceratode. 



Labium. Lower lip of an Arthropod attached to the mentum. 



Labrum. Upper lip of an Arthropod attached to the clypeus 

 (epistome of some writers), either with or without a membra- 

 nous connexion. 



Larva. A rather indefinite word, generally used for all animals 

 undergoing a metamorphosis, for the state in which they 

 emerge from the egg. 



Larynx. The upper part of the windpipe. 



Lemma. The primary or outer layer of the germinal vesicle. 



Life. " Organization in action " (Beclard). " The sum total of 

 the functions which resist death " (Bichai). " The movement 

 of the bioplasm ;" " the state of action peculiar to an organized 

 body or organism " ( W. B. Carpenter). " A series of definite 

 and successive changes, both of structure and composition, 

 which take place within an individual without destroying its 

 identity " ( &. H. Lewis). " The definite combination of hetero- 

 geneous changes, both simultaneous and successive, in cor- 

 respondence with external co-existences and sequences " (Herbert 

 Spencer). The last, speaking of the coordination of actions, 

 says, " an arrest of coordination is death, and imperfect coor- 

 dination is disease." Life is generally regarded as " a mode of 

 energy ; " in the Eotifers it may be dormant for years. 



Ligula. See Labium. 



Lingua. The tongue. The term is sometimes applied to a part 

 of the sucking-apparatus of insects, and to the " inner integu- 

 ment " of the labrum in some Orthoptera, &c. 



Lipostomy. Absence of a mouth. 



Lissotrichous or Liotrickous. Having straight smooth hair. The 

 hair is cylindrical, and a section of it circular. 



Lithocyst. A cavity containing mineral particles ; supposed to 

 be subservient to hearing. It occurs in the Coelenterata. 



