GLOSSARY. 



ABDOMEN. In mammals the part 

 of the trunk below or behind the 

 thorax ; in insects the third re- 

 gion of the body, or hind body. 



ABERRANT. Departing from the 

 regular or normal type. 



ABORAL. Opposite the oral or 

 mouth-region. 



ACUMINATE. Ending in a pro- 

 longed point. 



ALVEOLUS. A hollow cavity 

 forming the socket in the jaw 

 of vertebrates for the teeth. 



AMBULACRQM (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 ambulacral 

 feet are protruded. 



AMETABOLIC (Gr. a, without ; 

 metabole, change). Referring to 

 insects and other animals which 

 do not undergo a metamorpho- 

 sis. 



AMORPHOUS (Gr. a, privitive ; 

 morplie, form). Without a defi- 

 nite figure ; shapeless ; especially 

 applicable to sponges. 



AMPIIICCELOUS (Gr. arnphi; koilos, 

 hollow). Applied to vertebrae 

 which are doubly concave, or 

 hollow at both ends. 



ANASTOMOSING. Inosculating or 



running into each other like 

 veins. 



ANCHYLOSIS. The growing to- 

 gether of two bones so as to pre- 

 vent motion between them. 



ANNULATE. When a leg or antenna 

 is surrounded by narrow rings 

 of a different color. 



APLACENTAL. Referring to those 

 mammals in which the embryos 

 are destitute of a placenta. 



APODOUS. Footless. 



APTEROUS (Gr. a, without ; pteron, 

 wing). Destitute of wings. 



AQUIFEROUS (Lat. aqua, water ; 

 fero, I carry). Applied to the 

 water-carrying or water- vascular 

 system of the sponges, etc. 



AREOLATE. Furnished with small 

 areas ; like a net-work. 



ARISTATE. Furnished with a hair. 



ARTHROPODA (Gr. , without ; 

 arthros, a -joint ; pous, podos, 

 foot). Those Articulata with 

 jointed feet. 



ARTICULATA (Lat. artic-nli.nt, di- 

 minutive of artus, a joint). 

 Cuvier's subkingdom of worms, 

 Crustacea and insects. 



ARTIODACTYLA (Gr. artios, even ; 

 daklulos, finger or toe). Those 

 Ungulates with an even number 

 of toes, as the ox. 



ASEXUAL. Applied to animals, 



