GLOSSARY. 



AB-DO'MEN. In mammals the part 

 of the trunk below or behind 

 the thorax; in insects the third 

 region of the body, or hind 

 body. 



AB ER'RANT. Departing from the 

 regular or normal type. 



AB-O'RAL. Opposite the oral or 

 mouth region. 



A-BRAN'CHI-ATE (Gr. a, without; 

 bragchia, gills). Without bran- 

 chiae or gills. 



A-cu 'MI-NATE. Ending in a pro- 

 longed point. 



AL-VE'O-LUS. A cavity forming 

 the socket in the jaws of verte- 

 brates for the teeth. 



AM-BU-LA'CRUM (Lat. from ambu- 

 lare, to walk, a garden-walk). 

 The perforated space or area 

 in the shell of the sea-urchin or 

 the arm of a star-fish, through 

 which the foot-tubes or ambu- 

 lacral feet are protruded. 



A-ME-TA'BO-LIC (Gr. a, without ; 

 metabole, change). Referring 

 to insects and other animals 

 which do not undergo a meta- 

 morphosis. 



A-MOR'PHOUS (Gr. a, without; 

 morphe, form). Without a defi- 

 nite figure ; shapeless ; espe- 

 cially applicable to sponges. 



AM-PHI-CCE'LOUS (Gr. amphi; 

 koilos, hollow). Applied to 

 vertebrae which are doubly 

 concave, or hollow at both 

 ends. 



A-NAL'O-GY (Gr. analogia, propor- 

 tion). The relation between 

 organs which differ in struc- 

 ture, but have a similar func- 

 tion; as the wings of insects 

 and birds. 



A-NAS-TO-MO'SING. Inosculating 

 or running into each other like 

 veins. 



AN-CHY-LO'SIS. The growing to- 

 gether of two bones so as to 

 prevent motion between them. 



AN'NU-LATE. When a k'g or an- 

 tenna is surrounded by narrow 

 rings of a different color. 



A'PLA-CEN-TAL. Referring to 

 those mammals in which the 

 embryos are destitute of a pla- 

 centa. 



A'po-Dorjs. Footless. 



AP'TE-ROUS (Gr. a, without \pter- 

 on, wing). Destitute of wings. 



A-QUI'FE Rorjs(Lat. aqua, water; 

 fero, I carry). Applied to the 

 water-carrying or water-vascu- 

 lar system of the sponges, etc. 



A-RACH'NI-DA (Gr. arachne, a spi- 

 der). The class of Arthropods, 



