GLOSSARY. 



AB-DO'MEN (Lat. abdo, I conceal). The posterior cavity of the body, contain- 

 ing the intestines and others of the viscera. In many Invertebrates there ia 

 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. 



AB-ER'RANT (Lat. dberro, I wander away). Departing from the regular type. 



AB-NOR'MAL (Lat. aft, from ; norma, a rule). Irregular ; deviating from the 

 ordinary standard. 



AB-O-MA'SUM. The fourth cavity of the complex stomach of the Ruminants. 



A-BRANOH'I-ATE (Gr. a, without ; bragcMa, gills). Destitute of gills or bran- 

 chiae. 



A-CA-LE'PHJE (Gr. cikalephe, a nettle). Applied formerly to the Jelly-fishes or 

 Sea-nettles, and other Eadiate animals, in consequence of their power of 

 stinging, derived from the presence of microscopic cells, called " thread- 

 cells," in the integument. 



A-CAN-THO-CEPH'A-LA (Gr. akantfia, a thorn ; keptiale, head). A class of para- 

 sitic worms in which the head is armed with spines. 



A-OAN-THO-ME-TKI'NA (Gr. akantha / and metra, the womb). A family of Pro- 

 tozoa, characterized by having radiating siliceous spines. 



A-OAN-THO-PTER-YG'-I-I (Gr. akantha, spine ; pterux, wing). A group of bony 

 fishes with spinous rays in the front part of the dorsal fin. 



A-CAR'I-NA (Gr. akari, a mite). A division of the Arachnida, of which the 

 Cheese-mite is the type. 



AC-CRE'TION. 



A-CEPH'A-LOUS (Gr. a, without; kepTiale, head;. Not possessing a distinct 

 head. 



A-CE-TAB'U-LA (Lat. acetabulum, a cup). The suckers with which the cephalic 

 processes of many Cephalopoda (Cuttle-fishes) are provided. 



A-CE-TAB'U-LUM. The cup-shaped socket of the hip-joint in Vertebrates. 



AO'RI-TA (Gr. akritos, confused). A term sometimes employed as synony- 

 mous with Protozoa, or the lowest division of the animal kingdom. 



AO-TI-NOM'ERES (Gr. aktin, a ray ; meros, a part). The lobes which are 

 mapped out on the surface of the body of the Ctenopliora, by the cteno- 

 phores, or comb-like rows of cilia. 



AC-TIN-O-SO'MA (Gr. aktin ; and soma, body). Employed to designate the 

 entire body of any Actinozoon, whether this be simple (as in the Sea- 

 anemones), or composed of several zooids (as in most Corals). 



AC-TIIT-O-ZO'A (Gr. aktin; and zoon, an animal). That division of the Coden- 

 terata of which the Sea-anemones may be taken as the ty^pe. 



AD-EL- AR-THRO-SO'MA-TA (Gr. adelos, nidden; arikros, joint; soma, body). 

 An order of the Arachnida. 



AD-DUO'TOR. 



A-E'RI-AI,. 



A-GAM'IO (Gr. a, without; gamos, marriage). Applied to all forms of repro- 

 duction in which the sexes are not directly concerned. 



