TKDEX. 



423 



Animals and plants, differences be- 

 tween, 57 74 ; resume, 75. 



An'imate, possessed of animal life. 



Annel'ida, or Annel'ids, digestive 

 organs of the, 322 324 ; respira- 

 tion, 382. 



AnnulaHed (Lat. annulus^ a ring), 

 when an animal or part appears 

 to be composed of a succession of 

 rings. 



Anoplothe v rium (Gr. dvo-rrXog, un- 

 armed ; 9r]piov, beast), an ex- 

 tinct mammal, somewhat resem- 

 bling the pig, but unprovided 

 with tusks or offensive arms, 680. 



An'ourous (Gr. a, without ; ovpa, a 

 tail), tail-less. 



Anten'na (Lat. a yard-arm}, applied 

 to the jointed feelers, or horns, 

 upon the heads of insects and 

 Crustacea ; and sometimes to the 

 analogous parts which are not 

 jointed in worms and other ani- 

 mals. 



Anthozo'a (Gr. dvOog, a flower ; 

 wov, an animal), polyps (in- 

 cluding the actinia and allied 

 species), commonly called animal 

 flowers. 



Antiperistalt'ic (Gr. dvri, against ; 

 and peristaltic), when the vermi- 

 cular contractions of a muscular 

 tube follow each other in a direc- 

 tion the reverse of the ordinary 

 one; see PERISTALTIC. 



Ant'lia (Lat. a pump), restrictively 

 applied to the spiral instrument 

 of the mouth of butterflies and 

 allied insects, by which they pump 

 up the juices of plants. 



Aor'ta (Gr. doprri, the wind-pipe ; 

 and also the name of the great 

 vessel springing from the heart, 

 which is the trunk of the systemic 

 arteries) ; it is exclusively applied 

 in the latter sense in modern 

 anatomy. 



Aphid'ian, belonging to the aphis. 



A'phis (Greek), the aphis, or plant- 



louse, one of the articulata, alter- 

 nate generation of the, 526. 



Ap'ical (Lat. apex, the top of a 

 cone), belonging to the pointed 

 end of a cone-shaped body. 



Ap'odal (Gr. a, without ; Troda, 

 feet), footless, without feet or 

 locomotive organs ; fishes are so 

 called which have no ventral fins. 



Apoph'ysis (Greek), a projection 

 from the body of a bone. 



Apparatus of motion, 205 227. 



Ap'tera (a, without ; Trrtpov, awing), 

 wingless insects, xxii. 



Ap'terous (Gr. d, without ; Trrtpov, 

 a wing), wingless species of in- 

 sects or birds. 



Aquat'ic (Lat. aqua, water), living 

 in water. 



Aquat'ic animals, water tubes of,403. 



A'queous, like water. 



A v queous humour of the eye, 127- 



Arach'nida (Gr. dpaxvtj, a spider), 

 a class of articulates ; as spiders 

 and allied animals. 



Arach'nida?, or Arach'nids, digestive 

 organs of the, 326 ; jaws, 337 

 respiration, 385. 



Aracb/noid membrane, 85. 



Arbores'cent (Lat. arbor* a tree), 

 branched like a tree. 



Arc'tic (Gr. 'Ap/croc, the Bear, a 

 northern constellation, thus signi- 

 fying northern) fauna, the, 602 

 604. 



Are v olar (Lat. areola, a nipple 

 tissue, 41. 



Aristotle's lantern, jaws of the Echi- 

 nidag, so called, 335 



Arm of man, 281 ; corresponding 

 organ in other animals, 282 286. 



Arteries, 357. 



Arthro v dial (Gr. dpdpov, a joint) ; 

 it is restricted to that form of 

 joint in which a ball is received 

 into a shallow cup. 



Articula v ta (Lat. articulus, a joint), 

 a department of the animal king- 

 dom, consisting of animals with 



