132 GLOSSARY. 



in Insects, and two in Crustacea, the anterior in the latter case being dis- 

 tinguished as Antennules. 

 ANTHOZOA (&v6os, a flower ; &ov, an animal), a class of Coclenterata, otherwise 



called Actinozoa, and formerly Zoophyta, or animal plants, corresponding 



partly to Cuvier's Polypi. 

 APTERYX (a priv. ; irre'pul, a wing), the wingless bird of New Zealand, one of the 



Eatitx. 



ARACHXIDA (apax"7, a spider), a class of arthropodous Annulosa. 

 AKANEINA (aranea, a spider), an order of Arachnida. 

 ARCREOPTERYX (dpxaios, ancient ; irrepv, a wing), an extinct genus of birds, the 



only representative of the order Saururx. 

 AECTISCA (&PKTOS, a bear), an order of Arachnida, known as water-bears, otherwise 



called Tardigrada. 

 ARTHEOGASTRA (&p9pov, a joint; yourr-hp, belly), an order of Arachnida with 



distinctly jointed abdomens. 

 ARTHROPODA (&p6pov, a joint ; wous, a foot), those Annulose classes which have 



jointed limbs. 



AETICULATA (articulus, dim. of artus, a joint), animals with jointed bodies, other- 

 wise called Annulosa. 

 ARTIODACTYLA (&pnos, even ; SOKTUAOS, a finger or toe), an order of Mammalia, 



with the toes of the feet either two or four in number: it includes the 



Ruminantia and some of the Pachydermata of Cuvier. 



ASCARIS (affKapls, a maw- worm), the " round-worm," one of the human Entozoa. 

 ASCIDIOIDA (dffic6s, a bag), an order of Molluscoida, otherwise called Tunicata. 

 ASTERTDEA (do-T-fip, a star, a star-fish Arist. H. A. v., xv. 20), an order of 



Echinodermata. 

 ASTRAGALUS (a<rrpdya\os, a huckle-bone), the tarsal bone which articulates with 



the tibia. 

 ATLAS ("ATAOS, the god who holds up the earth), the vertebra which articulates 



with the skull. 



ATRIUM (a hall), applied to the cavities peculiar to the Molluscoida. 

 AURICLE (auricula, dim. of auris, an ear , applied to an appendage of the heart in 



Mammals, and thence extended to the cavity of a heart of whatever form 



which receives blood and propels it into the ventricle. (This cavity is 



generally called atrium in German works ) 



AXILLA (the long form of ala, a wing, as maxilla of mala), the arm-pit. 

 Axis (&a>v), a pivot : the second cervical vertebra on which the skull and atlas 



commonly rotate. 

 AZTGOS (a priv. ; (,vy6v, a yoke, a pair), an organ in the middle line of a bilaterally 



symmetrical animal, which has therefore no fellow. 

 BALEEN (balsena, </>a\AatVct, a whale Arist. H. A. i., v. 2), the horny plates which 



line the roof of the true whales' mouths, commonly called whalebone. 

 BASIOCCIPITAL (basis, ob, caput), the centre of the first cranial segment, corre- 

 sponding with the basilar process in human anatomy. 

 BASISPHENOID (j8a<m, o-^rjvoeiS^js, wedge-shaped), the centre of the second cranial 



segment of the skull, corresponding with the tody of the sphenoid behind the 



Bella Turcica in Man. 

 BATRACHIA (fidrpaxos, a frog), an order of Cuvier's system, which corresponds 



with the class Amphibia ; now used as an order of this class, corresponding 



with Anura, or tail-less Amphibia: v. UBODELA. 

 BELODON (j3e'\oy, a dart ; oSovs, a tooth), an extinct genus of Crocodilia. 



