478 GLOSSARY. 



Amceba (Gr. amoihos, changing). A species of Rhizopod, so called from the 



nnmerous changes of form which it undergoes. 

 Amcebiform. Resembling an Amceba in form. 



Amouphozoa (Gr. a, without ; morphc, shape ; zoon, animal). A name some- 

 times used to designate the Sponges. 

 Amphibia (Gr. amiyhi, both ; bios, life). The Frogs, Newts, and the like, 



which have gills when young, but can always breathe air directly when 



adult. 

 Amphiccelous (Gr. amphi, at both ends; Z;oj7os, hollow). Applied to verte- 



brjE which are concave at both ends. 

 Amphipoda (Gr. amphi, and pons, a foot). An order of Crustacea. 

 Anal (Lat. anus, the vent). Connected with the anus, or situated near the 



anus. 

 Anarthropoda (Gr. a, without ; arthros, a joint ; pous, foot). That division 



of Annulose animals in which there are no articulated appendages. 

 Anchylosis or Ankylosis (Gr. ankidos, crooked). The union of two bones 



by osseous matter, so that they become one bone, or are immovably joined 



together. 

 Angiosperms (Gr. aggeion, a vessel ; sperma, seed). Plants which have their 



seeds enclosed in a seed-vessel. 

 Annelida (a Gallicised form of Anmdata). The Ringed Worms, which form 



one of the divisions of the Anarthropoda. 

 Annulated. Composed of a succession of rings. 



Annulotda (Lat. annulus, a ring ; Gr. eidos, form). The sub-kingdom com- 

 prising the EcMnodermata and the Scolecida {=^Ediinozoa). 

 Annulosa (Lat. annuhis). The sub-kingdom comprising the Anarthropoda 



and the Arthropoda or Articulata, in all of which the body is more or less 



evidently composed of a succession of rings. 

 Anomodontia (Gr. anomos, irregular; odoiis, tooth). An extinct order of 



Reptiles, often called Dicynodontia.. 

 Anomura (Gr. anomos, irregular ; oiira, tail). A tribe of Decapod Crusta.cea, 



of which the Hermit-crab is the type. 

 Anoplotherid^ (Gr. anoplos, unarmed ; ther, beast). A family of Tertiary 



Ungulates. 

 Anoura (Gr, a, Avithont ; ovra, tail). The order oi Amphibia comprising the 



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



Bairachia^. 

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



by the majority of the Articulata. 

 Antennules (dim. of Antennce). Applied to the smaller pair of antennae, in 



the Crustacea. 

 Antibrachium (Gr. anti, in front of ; brachion, the arm). The fore-arm of 



the higher Vertebrates, composed of the radius and uhia. 

 Antlers. Properly the branches of the horns of the Deer tribe {Cervidcc), 



but generally applied to the entire horns. 

 AprocRiNiDiE (Gr. apion, a pear ; krinou, lily). A family of Crinoids — the 



" Pear-encrinites." 

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



of the Didclphia and Ornithodelphia, in which the young is not furnished 



with a placenta. 



