GLOSSARY. 265 



Archebiosis = spontaneous generation. 



Archetype. The simple primary form. 



Archigony. The primitive generation of organic from inorganic 

 matter. 



Arrhenotocous. Applied to those cases in which males only 

 are developed from the eggs. The females are partheno- 

 genetic. 



Arthrium. The minute penultimate tarsal joint of many Cole- 

 optera. 



AsterisGus. One of the otoliths in fishes. 



Astomatous. Without a mouth. 



Astragalus. A tarsal bone articulating above with the tibia. 



Atavism. See Reversion. 



Atlas. The first vertebra of the neck. 



Atrium. The cloacal cavity of the Tunicata. 



Auricle. A cavity of the heart. 



Autogenous. When parts of a bone are developed from inde- 

 pendent centres of ossification. 



Autogeny. The origin of an organism from " an inorganic for- 

 mative fluid." 



Autophagous. When newly-born animals are at once capable of 

 feeding themselves. 



Avicularia. Organs of prehension in the Polyzoa, consisting of 

 a movable portion, or mandible, and a corresponding fixed 

 portion. 



Axis. The second vertebra of the neck. 



Azygous. Single ; without a fellow. 



Barbs. The small branches forming collectively the web or yane 

 of a feather. 



Barbule. The small processes on each side of the barb. 



Basipodite. The small conical joint (the second) attached to the 

 first joint of the leg of a Crustacean. 



Biogenesis. The production of living from pre-existing organ- 

 isms, 



Biology. The science of living beings, ineluding Zoology and 

 Botany. 



Bioplasm. Dr. Beale's name for Protoplasm. 



Bioplast. See Plastide. 



