GLOSSARY. 7 



Anco'neus (Gr. ankon, the elbow). A name given to muscles 



placed mainly below the elbow and fore-arm. 

 An'drophore (Gr. aner, andros, a man; phoreo, I bear). The 



branches of the gonoblastidium of some Siphonophora 



which bear the male gonophores. 

 An'eurism (Gr. aneuruno^ I enlarge). A tumour filled with 



blood arising from the rupture, wounding, or dilatation of 



an artery. 

 Anfractuo'sities (L. anfradus, a winding). The furrows or 



sulci which divide the convolutions of the brain. 

 Angeio'logy (Gr. angeion, a vessel; logos, discourse). The 



department of Anatomy which comprises a description 



of the blood-vessels and absorbents. 

 An'gular (L. angulus, a corner). A bone of the mandible in 



some Vertebrata. 

 Ang'ulo-sple'nial (L. angulus, a corner ; splenium, a splint). 



One of the bones of the mandible in some vertebrate skulls. 

 An'kylose (see Anchylose). 

 Annelida (L.annulits, a ring). A division of the Anarthropoda 



which embraces the earth-worm, leech, &c. 

 Annula'ris (L. annulus, a ring). The fourth digit of the manus, 



which in man is the "ring-finger." 

 Annuloi'da (L. annulus, a ring). A division of the Invertebrata, 



formerly including the Echinodermata and the Scolecida, 



but now used by Huxley for a series which embraces the 



Annelida and Trichoscolices/ 

 Annulo'sa (L. annulus > a ring). A division of the Invertebrata 



which includes the Arthropoda and Anarthropoda. 

 An'nulus (L. a ring). Applied to a thin ring of chitine which 



encircles the mantle of the Tetrabranchiata, and into which 



the shell muscles are inserted. Also to the cellular ring 



which lines the sporangium of a fern. 

 An'nulus ovalis (L. oval ring). The border which bounds the 



fossa ovalis of the septum between the auricles of the 



heart. 



Anodon'ta (Gr. an, not ; odous, odontos, a tooth). The fresh- 

 water mussels, which are bivalve molluscs, having valves 



which are destitute of teeth. 

 Anomu'ra (Gr. anomos, irregular; cura, a tail). A tribe of 



Decapod Crustacea, of which the hermit crab is a type. 

 Anoplothe'ridse (Gr. anoplos, unarmed; ther, a beast). A 



family of extinct mammals belonging to the eocene and 



miocene epochs. 



