GLOSSARY 



Pronunciations are indicated in this glossary as far as possible without the aid of 

 diacritical marks, but the following symbols have been necessary : 

 H = the German ch ; 

 N = the French nasal n ; 



ii = the French u, pronounced by shaping the lips for sounding long oo and the 

 tongue for long ee. 



Abiogenesis {ab' i o jen' e sis) . The doctrine that living things originate from non- 

 living matter; same as spontaneous generation. In its crude early form the 

 doctrine has been abandoned. 



Aboral (ab o' ral). Opposite the mouth. 



Absorption {ab sorp' shun). The imbibing of a liquid by osmotic or capillary action. 



Acanthocephala {a kan' tho sef a la) . A group of parasitic worm-like animals 

 usually included with the Nemathelminthes. For definition see Chapter XII. 



Acetabulum {as' e tab' u lum). The socket on either side of the pelvic girdle for the 

 head of the femur. 



Achromatic figure {ak' ro mat' ik). That part of the division figure in mitosis which 

 does not stain deeply, namely, the spindle including centrospheres and asters, but 

 excluding the chromosomes. 



Acris {ak' ris). A genus of frogs. 



Actinian {ak tin' i an). A sea anemone. 



Actinomorphes (ak' tin o mor' Jeez). A group of animals in Blainville's early classifica- 

 tion; animals with radiating parts, such as the starfish. 



Actinophrys {ak' li nof ris). A genus of rhizopod Protozoa, of the order Heliozoa. 

 Actinosphaerium {ak' ti no sfe' ri um). A genus of rhizopod Protozoa, of the order 

 Heliozoa. 



Adaptation (ad' ap ia' shun). litness for the environment. In a concrete sense, an 

 adaptive structure, habit, or function. 



Adductor {ad duk' ter). One of the large muscles attached to the valves of a mussel 

 shell, or the corresponding muscle of a glochidium; also, one of numerous muscles 

 in other animals which draw a structure toward the median axis. 



Adipose (ad' i pose). Pertaining to fat. 



Adrenal {adre' nal). One of two or more ductless glands in close relation with the 



kidneys in most vertebrates. 

 Aeolosoma (e' o lo so' ma). A genus of worms, phylum Annelida, subclass Oligochseta. 

 Aganides {ag' a ni' deez). A genus of extinct cephalopods with bent sutures of the 



goniatite form. 



Agar {ah' gar). A nutrient material used in bacterial cultures, etc. 



Agassiz, Jean Louis Rodolphe {ah' gah see', Eng. ag' a see). Swiss- American natural- 

 ist, 1807-1873. 



Albinism {al' hi niz'rn). The absence of the usual pigments in skin, hair, and eyes; 

 said of individuals having white skin and hair and pink iris in species usually 

 colored. 



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