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- 
chie or gills. 
A-CU'ML-NATE. Ending in a pro- 
longed point. 
AuL-ve'o-Lus. A cavity forming 
the socket in the jaws of verte- 
brates for the teeth. 
AM-BU-LA'CRUM (Lat. from ambu- 
lave, to walk, a garden-walk). 
The perforated space or arca 
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'BG-LIC (Gr. a, without ; 
metabole, change). Referring 
to insects and other animals 
which do not undergo a meta- 
morphosis. 
A-mor'PHous (Gr. @, without; 
morphe, form). Without a defi- 
nite figure; shapeless; espe- 
cially applicable to sponges. 
AM-PHI-c@’Lous (Gr. amphi; 
koilos, hollow). Applied to 
vertebre 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-cuy-Lo’sis. The growing to- 
gether of two bones so as to 
prevent motion between them. 
AN’NU-LATE. When a leg 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 Dous. Footless. 
Ap’TE-ROUS (Gr. aw, without; pier- 
on, wing). Destitute of wings. 
A-QUI'FE ROUS (Lat. agua, water; 
Jfero, I carry). Applied to the: 
water-carrying or water-vascu-. 
lay system of the sponges, etc. 
A-RACH'NL-DA (Gr. arachne, a spi-- 
der). The class of Arthropods.. 
