GLOSSARY. . 9 



Aorta (perhaps from Gr. aeiro, I take up, suspend, or carry). 

 The main artery which springs from and suspends the 

 heart. 



Apha'sia (Gr. a, not; phasis, speech). Loss of the mental 

 faculty of speech as distinguished from paralysis of the 

 organs concerned in speech. 



Apnoe'a (Gr. a, not ; pneo, I breathe). A condition in which, 

 owing to an abnormally large supply of oxygen to the 

 blood, the respiratory movements are temporarily sus- 

 pended. Sometimes used pathologically as the exact ' 

 opposite of this, viz, as almost synonymous with asphyxia. 



Apo'da (Gr. a, not ; pous, podos, a foot). A group of the 

 Cirripedia, the sole representative of which has neither 

 thoracic nor abdominal limbs. 



A'podemes (Gr. apodemeo, to go away, travel). Processes which 

 in the tenth, eleventh, twelfth, and thirteenth somites of 

 the cephalothorax of the crayfish, project inwards and 

 unite with one another in the thorax. 



Apolar (Gr. a, not ; polos, a pole). A term applied to those 

 nerve corpuscles which have no radiating processes. 



Aponeuro'sis (Gr. apo, from ; neuron, a sinew). White fibrous 

 tissue spread out in a sheet, which envelopes and binds 

 down the muscles of different regions. 



Apo'physis (Gr. apophuo, I grow from). A process or pro- 

 tuberance of bone. 



Appen' dices epiploi'cae (L. appendix, an appendage ; Gr. 

 epiploon, the omentum). Projections from the serous coat 

 of the large intestine containing fat. 



Appendfcular (L. appendix, an appendage). Applied to that 

 part of the skeleton (the limbs) which is attached to the 

 axial skeleton. 



Appen'dix vermifor'mis (L. worm-like appendage). A narrow 

 tapering process of the caecum. 



Appen'dix vesfcae (L. appendage of the bladder). An ab- 

 normal protrusion of a part of the mucous coat of the 

 bladder through the muscular coat. 



Aproc'ta (Gr. a, not; proktos, the anus or seat). A group of 

 the Turbellaria in which there is no anal aperture. 



Apte'ria (Gr. a, not ; pteron, a feather). The spaces between 

 the contour feathers in a bird. 



Aptery'gidae (Gr. a, not ; pteron, a wing). A subdivision of the 

 Ratitse in birds, -which comprises the extinct wingless 

 bird of New Zealand 



