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. 



Aberk.ynt. 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. 



Ambulacrum (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. 



Ambtabolic (G-r. a, without ; 

 -metabole, change). Referring to 

 Insects and other animals which 

 do not undergo a metamorpho- 

 sis. 



Amorphous (Gr. a, privitive ; 

 morphe, form). Without a defi- 

 nite figure ; shapeless ; especially 

 applicable to sponges. 



Amphiccelous (Gr. amphi ; kfAlos, 

 hollow). Applied to vertebrie 

 which are doubly concave, or 

 hollow at both ends. 



ANASTOMOsma. 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. u, without ; pteroii, 

 wing). Destitute of wings. 



Aquiperous (Lat. (ujua, water ; 

 fero, I carry). Applied to the 

 water-carrying or water- vascular 

 system of the sponges, etc. 



Arbolate. Furnished with small 

 areas ; like a net-work. 



Aristate. Furnished with a hair. 



Arthropoda (Gr. a, without ; 

 arihros, a joint ; poiia, podos, 

 foot). Those Articulata with 

 jointed feet. 



Articulata (Lat. articuhis, di- 

 minutive of artus, a joint). 

 Cuvier's subkingdom of worms, 

 Crustacea and insects. 



Artiodacttla (Gr. arlios, even ; 

 claMuhs, finger or toe). Those 

 Ungulates with an even number 

 of toes, as the ox. 



Asexual. Applied to animals, 



