GLOSSARY. 
Abdomen. (Latin, 24d, I conceal.) In mammals, that portion of 
the body-cavity which is separated from the thorax or chest by the 
diaphragm. 
Acalephx. (Greek, akalephe, «a nettle.) Jelly-fishes or sea-nettles 
that sting. 
Acephalous. (Greek, 2, without ; 4ephale, the head.) Without a dis- 
tinct head, as the Lamellibranchiata, 
Actinozoa. (Greek, aétis, a ray; 20d, animal.) A class of Calen- 
terata. 
Albumen. (Latin, a/éus, white.) Resembling the white of an egg. 
Alveolus. A hollow cavity forming a’socket for the teeth. 
Anchylosis. The growing together of two bones to prevent motion. 
Ameeba. (Greek, amoibe, a change.) One of the Rhizopods that is 
continually changing its shape. 
Amphibia. (Greek, amphi, both ; dios, life.) A class of vertebrates, 
breathing in water while young and in air when mature. The 
term amphibious is applied to fishes, mollusks, etc., that are capable 
of changing the nature of their respiration at will. 
Antennz. (Latin, axtenna, the yard of aship.) The jointed append- 
ages on the heads of insects, crabs, etc. 
Auricle. (Diminutive of auris, an ear.) The cavity of the heart that 
receives the blood and transmits it to the ventricle. 
Asexual. A term applied to animals, as Aphis, page 123, in which 
the reproductive organs are imperfect, and the young are produced 
by budding. 
Artiodactyla. (Greek, artios, even; daktulos, finger or toe.) Even- 
toed ungulates. 
Bivalve. (Latin, ds, twice; valve, folding-doors.) Shells with two 
valves. 
Branchiz. (Greek, dranchia, gills.) Breathing-organs of fishes, etc. 
