574 GLOSSARY. 



ANOPLURA (Gr. anoplos, unarmed ; oura, tail). An order of Apterous Insects. 

 ANOURA (Gr. a, without ; oura, tail). The order of Amphibia comprising the 



Frogs and Toads, in which the adult is destitute of a tail. Often called 



Batrachia. 

 ANTENNA (Lat. antenna, a yard-arm). The jointed horns or feelers possessed 



by the majority of the Articulata. 

 ANTENNULES (dim. of Antenncs). Applied to the smaller pair of antennse 



in the Crustacea. 

 ANTIBRACHIUM (Gr. anti, in front of ; Irachion, the arm). The fore-arm of 



the higher Vertebrates, composed of the radius and ulna. 

 ANTLERS. Properly the branches of the horns of the Deer tribe (Cervidce), 



but generally applied to the entire horns. 

 ANTLIA (Lat. antlia, a pump). The spiral trunk or proboscis with which 



Butterflies and other Lepidopterous Insects suck up the juices of flowers. 

 APHANIPTERA (Gr. aphanos, inconspicuous ; pteron, a wing). An order of 



Insects, comprising the Fleas. 

 APLACENTALIA. The section of the Mammalia, comprising the two divisions 



of the Didelphia and Monodelphia, in which the young is not furnished with 



a placenta. 

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



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

 APODAL. Devoid of feet. 

 APODEMATA (Gr. apodaio, I portion off). Applied to certain chitinous septa 



which divide the tissues in Crustacea. 

 AFTER A (Gr. a, without; pteron, 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. 

 ARCHJEOPTERYX (Gr. archaios, ancient ; pterux, wing). The singular fossil 



bird which alone constitutes the order of the Saururce. 



ARCHENCEPHALA (Gr. archo, I overrule ; egkephalos, brain). The name ap- 

 plied by Owen to his fourth and highest group of Mammalia, comprising 



Man alone. 



ARENACEOUS. Sandy, 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 Arthropoda 



is now more usually employed. 

 ARTIODACTYLA (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). 

 ASCIDIOIDA (Gr. askos, a bottle ; eidos, 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 Lamellibranchiate 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, charac- 

 terised 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. 

 ATRIUM (Lat. a hall). Applied to the great chamber or " cloaca/' into which 



the intestine opens in the Timicata. 



