GLOSSARY. 



Ab-do'men. In mammals the part 

 of the truuk below or behind 

 the thorax; in insects the third 

 region of the body, or hind 

 body. 



Ab er'bant. Departing from the 

 regular or normal type. 



Abo'kal. Opposite the oral or 

 mouth region. 



A-bkan'chi-ate (Gr. a, without; 

 bragchia, gills). Without bran- 

 chijB or gills. 



A-cd'hi-natb. Ending in a pro- 

 longed point. 



Al-vb'o-lus. a cavity forming 

 the socket in the jaws of verte- 

 brates for the teeth. 



Am-bu-la'crum (Lat. from amhu- 

 lare, to walk, a garden-walk). 

 The perforated space or area 

 in the shell of the sea-urchin or 

 the arm of a star-tisb, through 

 which the foot-tubes or ambu- 

 lacral feet are protruded. 



A-me-ta'bo-lic (G-r, a, without ; 

 metabole, change). Refeixing 

 to insects and other animals 

 which do not undergo a meta- 

 morphosis. 



A-mok'phous (Gr. a, without; 

 morp?ie, form). Without a defi- 

 nite figure ; shapeless ; espe- 

 cially applicable to sponges. 



Am-phi-cce'lous (Gr. ampM; 

 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-oiiy-lo'sis. The growing to- 

 gether of two bones so as to 

 prevent motion between them. 



An'ku-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 R0i3S(Gr. a, without; pter- 

 on, wing). Destitute of wings. 



A-qtji'fe ROUS (Lat. aqria, 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, 



