GLOSSARY. 



Acanthoceph'ala (pi.) (" thorny- 

 heads"), a small group, or phylum, 

 of worm-like organisms, living 

 within the bodies of other ani- 

 mals; they have hooks, or spines, 

 upon the head. 



Acar'ida (pi.) ("atoms," "indivis- 

 ibles"), mites; insects of low 

 type. 



Aceph'ala ("headless"), an order of 

 mollusks, to which the oyster and 

 clam belong. 



Actinozo'a (pi.) (" rayed animals"), a 

 class of marine animals, including 

 corals, etc. 



JEpyor'nis ("tall bird"), a huge ex- 

 tinct bird of Madagascar. 



JEstiva'tion (" summering"), the tor- 

 pid state of certain animals in the 

 hottest season. 



Albi'nism, abnormal whiteness in the 

 skin, hair, or feathers. 



Amblyp'oda (pi.) (" clumsy-footed"), a 

 group of huge extinct mammals 

 that probably had some of the 

 characters of the elephant. 



Amoe'ba (" changing"), a minute ani- 

 mal organism capable of changing 

 its form at will. 



Amphib'ia (pi.) (" double living"), an 

 order of vertebrate animals, living 

 at first in the water, and later capa- 

 ble of living in either air or water, 

 as frogs, newts, etc. 



Amphip'oda (pi.) (" having feet in 

 either direction"), an order of crus- 

 taceans which have feet partly 



directed forwards and partly back- 

 wards. 



Anat'omy (" cutting up"), the science 

 of organic structure. 



Anten'na ("a sail-yard"), a horn-like 

 process on the head of certain insects 

 and crustaceous animals ; a feeler. 



A'phid. See APHIS. 



A'phis (" unsparing" or "profuse"), a 

 genus of minute insects called 

 plant-lice ; they are exceedingly 

 destructive to vegetation. 



Appendicula'ta (pi.) (" appendaged"), 

 a great phylum, including the Ro- 

 tifera, Chaetopoda, and Arthropoda. 



Ap'tera (pi.) (" no wings"), a class of 

 wingless insects. 



Arach'nida (pi.) (" spiders"), a group 

 of articulate animals, including 

 spiders, scorpions, and mites. 



Arthrop'oda (pi.) ( "jointed feet"). See 

 ARTICULATA. A division of the 

 animal kingdom nearly equivalent 

 to Articulata. But the term Arthrop- 

 oda is the wider in its significa- 

 tion, and is now more often em- 

 ployed than Articulata. 



Articula'ta (pi.) ("jointed"), a di- 

 vision of the animal kingdom, in- 

 cluding animals whose bodies are 

 composed of joints or rings. See 

 ARTHROPODA. 



Artiodac'tyla (pi.) ("even-toed"), a 

 suborder of ungulate animals hav- 

 ing an even number of toes on each 

 foot, as swine, camels, and rumi- 

 nants. 



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