GLOSSARY 



Abdo'men, (i) the hinder portion of the body of an invertebrate; (2) of 

 higher animals, the region or cavity containing the stomach, intestine, 

 etc. 



Albu'men, (i) a proteid substance ; (2) " white of egg." 



A'nal, pertaining to the anus, or hinder opening of the intestine. 



Anal fin, a ventral median fin of fishes, just baclc of the anus. 



Animal Communities, associations of many animals of the same species. 



An ten'na, a segmented sensory appendage on the head of an arthropod. 



An ten'nule, a small antenna. 



An te'ri or, farther forward, in front of ; at the head or forward end. 



Aor'ta, a large artery arising at the heart and forming the trunk of the 

 arterial system. 



Ap'er ture, an opening. 



Ap pend'age, a projection from the body, usually one of a pair. 



Ar thiop'o da, a group of animals with a segmented trunk and paired, seg- 

 mented appendages. 



Ar ti dac'tyl, an ungulate with an even number of toes. 



A sex'u al, without sex. 



Au'di to ry, pertaining to hearing. 



Barb, one of the lateral outgrowths of the shaft of a feather, forming the 



vane. 

 Barb nle, a small outgrowth of the barb of a feather. 

 Bi lat'er al sym'me try, having the right and left sides mirror images one of 



the other. 

 Body cavity, the space between the body wall and the alimentary canal. 

 Body-wall, the outer wall in bodies of the many-celled animals.- 

 Budding, a form of fission in which a cell or portion of the body forms a 



small protuberance or bud, which is then cut off from the parent and 



forms a new individual. 



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