GLOSSARY. 



A^b-do'men (Lat. ahdo^ I conceal). The posterior cavity of the body, contain- 

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

 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'bant {Lat. aberro^ I wander away). Departing from the regular type. 



Ab-nor'mal (Lat. 06, from; iiornia^ a nde). Irregidar ; deviating from tlie 

 ordinary standard. 



Ae-o-ma'sum. The fourth cavity of the complex stomach of the Euminants. 



A-braxch'i-ate (G-r. a, without ; hragchia^ giU^J- Destitute of gills or bran- 

 chiae. 



A-ca-le'ph^ (Gr. akaleplie^ a nettle). Applied formerly to the Jelly-fishes or 

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

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

 cells," m the integument. 



A-can-tho-ceph'a-la (Gr. akantlia^ a thorn ; Tcephale^ head). A class of para- 

 sitic worms in which the head is armed with spines. 



A-can-tho-jie-tri'na (Gr. akantha ; and matra^ the womb). A family of Pro- 

 tozoa^ characterized by having radiating siliceous spines. 



A-can-tho-pter-tg'-i-i (Gr. ahantha^ spine ; ptervx^ 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'tiox. 



A-ceph'a-lol's (Gr. a, without ; JcepJudc^ head> Not possessing a distinct 

 head. 



A-ce-tae'tj-la (Lat. acetahul.um^ a cup). The suckers with which the cephalic 

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



A-oe-tab'u-lum. 'jfhe cup-shaped socket of the hip-joint in Vertebrates. 



Ao'ri-ta (Gr. akritos^ confused). A term sometimes employed as S}'nony- 

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



Ao-Ti-NOii'EEES (Gr. aktin^ a ray; -mfros^ a part). The lobes which are 

 mapped out on the surface of the body of the Ctenophora^ by the cteno- 

 phores, or comb-like rows of cilia. 



Ac-TiN-o-so'iiA (Gr. ahtin ; and soma^ body). Employed to designate the 

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

 anemones), or composed of several 2ouids (as in most Corals). 



Ao-tin-o-zo'a (Or. aktin ; and zo^jn^ an animal). That division of the Ccden- 

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



Au-el-ab-thro-so'ma-ta (Gr. adelos, hidden; arthros^ joint; soma, body). 

 An order of the Aracknlda. 



Ad-duo'toe. 



A-e'ei-al. 



A-gam'io (Gr. a, without; rianios, marriage). Applied to all forms of repro- 

 duction in which the sexes are not directly concerned. 



