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GLOSSARY. Abdomen (Lat. abdo, I conceal). The posterior cavity of the body, contain ing the intestines and others of the viscera. In many Invertebrates there is no separation of the body-cavity into thorax and abdomen, and it is only in the higher Annulosa that a distinct abdomen can be said to exist. Aberrant (Lat. aberro, I wander away). Departing from the regular type. Abnormal (Lat. ab, from; norma, a rule). Irregular; deviating from the ordinary standard. Abranchiate (Gr. a, without; bragchia, gill). Destitute of gills or bran chiae. Acanthopterygii (Gr. akantha, spine ; plerux, wing). A group of bony fishes with spinous rays in the front part of the dorsal fin. Acarina (Gr. akari, a mite). A division of the Araclinida, of which the Cheese-mite is the type. Acephalous (Gr. a, without; kephale, head). Not possessing a distinct head. Acetabula (Lat. acetabulum, a cup). The suckers with which the cephalic processes of many Cephalopoda (Cuttle-fishes) are provided. Acetabulum. The cup-shaped socket of the hip-joint in Vertebrates. Acrodont (Gr. akros, high ; odous, tooth). Applied to Lizards, in which the teeth are anchylosed with the summit of the jaw. Acrogens (Gr. akros, high; gennao, I produce.) Plants which increase in height by additions made to the summit of the stem, by the union of the bases of the leaves. Actinozoa (Gr. aktin, a ray; and zoon, an animal). That division of the Ccelenterata of which the Sea-anemones may be taken as the type. Alveoli (Lat. dim. of alvus, belly). Applied to the sockets of the teeth. Ambulacra (Lat. ambulacrum, a place for walking). The perforated spaces or “avenues” through which are protruded the tube-feet, by means of which locomotion is effected in the Echinodermata. Ambulatory (Lat. ambulo, I walk). Formed for walking. Applied to a single limb, or to an entire animal. Ammonitida*:. A family of Tetrabranchiate Cephalopods, so called from the resemblance of the shell of the type-genus, A mmonites, to the horns of the Egyptian God, Jupiter-Ammon. Amocba (Gr. amoibos, changing). A species of Rhizopod, so called from the numerous changes of form which it undergoes. Amcebiform. Resembling an Amoeba in form. Amorphozoa (Gr. a, without; moiphe, shape ; zoon, animal). A name some times used to designate the Sponges. Amphibia (Gr. amphi, both; bios, life). The Frogs, Newts, and the like, which have gills when young, but can always breathe air directly when adult. Amphicielous (Gr. amphi, at both ends ; koilos, hollow). Applied to verte brae which are concave at both ends.