GLOSSARY. 479 



Apoda (Gr. a, without ; podes, feet). Applied to those fishes which have no 

 ventral fins. Also to the footless Ccecilice amongst the Amphibia. 



Apodal. Devoid of feet. 



Apteea (Gr. a, without ; fteron, a wing). A division of Insects, which is 

 characterised by the absence of wings in the adult condition. 



Apterous. Devoid of wings. 



Apteryx (Gr. a, without ; pterux, a wing). A wingless bird of New Zealand, 

 belonging to the order Cursores. 



Arachnida (Gr. arachne, a spider). A class of the Articulata, comprising 

 Spiders, Scorpions, and allied animals. 



Arborescent. Branched like a tree. 



Arch/EOPTertx (Gr. archaios, ancient ; pterux, wing). The singular fossil 

 bird which alone constitutes the order of the Saururce. 



Arenaceous. Sandj% or composed of grains of sand. 



Articulata (Lat. articulus, a joint). A division of the animal kingdom, 

 comprising Insects, Centipedes, Spiders, and Crustaceans, characterised by 

 the possession of jointed bodies or jointed limbs. The term Artliropoda is 

 now more usually employed. 



Artiodacttla (Gr. artios, even ; daktulos, a finger or toe). A division of 

 the hoofed quadrupeds [Ungulata) in which each foot has an even number 

 of toes (two or four). 



Asctdioida (Gr. askos, a bottle ; cidos, a form). A synonym of Tunicata, a 

 class of Molluscous animals, which have the shape, in many cases, of a. two- 

 necked bottle. 



Asexual. Applied to modes of reproduction in which the sexes are not 

 concerned. 



AsiPHONATE. Not possessing a respiratory tube or siphon. (Applied to a 

 division of the LamellibraneMate Molluscs. ) 



Asteroid (Gr. aster, a star ; and eidos, form). Star-shaped, or possessing 

 radiating lobes or rays like a star-fish. 



AsTEROiDEA. An Order of Echinodermata, comprising the Star-fishes, char- 

 acterised by their rayed form. 



AsTOMATOUS (Gr. a, without ; stoma, mouth). Not possessing a mouth. 



Atlas (Gr. the God who holds up the earth). The first vertebra of the neck, 

 which articulates with and supports the skull. 



Aves (Lat. avis, a bird). The class of the Birds. 



Avicularium (Lat. avicula, dim. of avis, a bird). A singular ap- 

 pendage, often shaped like the head of a bird, found in many of the 

 Polyzoa. 



Axis (Gr. axon, a pivot). The second vertebra of the neck, upon which the 

 skull and atlas usually rotate. 



AzYGOUS (Gr. a, without ; zugon, yoke). Single ; without a fellow. 



Balanid^ (Gr. balanos, an acorn). A family of sessile Cirri2)edcs, common]}^ 



called " Acorn-shells." 

 Baleen (Lat. balcena, a whale). The horny plates which occupy the palate 



of the true or " whalebone " Whales. 

 Batides (Gr. batos, a bramble). The family of i\iQ ElasviobrancMi comprising 



the Kays. 

 Batrachia (Gr. batracJws, a frog). Often loosely applied to any of the Am- 



