372 INDEX-GLOSSARY. 



Edges Pre-axial, 225 ; Post-axial, 225. 



Edentata, 346, 349, 354. 



Eel, 153. 



Efferent (cfferens, carrying out) Of nerve fibres carrying impulses away 

 from a ganglion cell or the central nervous system, 102, 146, 217. 



Egg The fertilized ovum often with nutritive and protective layers, 36, 43, 

 52, 83, 100, 132, 167, 256, 305. 



Egg-capsule, 64, 67. 



Elasmobranchii, 153. 



Elephant, 5, 356. 



Emboly Formation of the gastrula by inpushing of endoderm cells, 68. 



Embryo (see Development), free e., 35, 36. 



Embryology The history of the early stages of development. See, Deve- 

 lopment. 



Embryonic appendages. See Amnion and Allantois. 



Embryonic circulation, 267. 



Emulsion, 58. 



Enamel The part of a tooth or scale developed from the epidermis, 155. 



Encystment The formation of a cyst, 14, 16, 18. 



End-body, 216. 



End-brush, 216. 



Endoderm (evSov, within ; <5e'pM, the skin) The inner cell-layer of the 

 body, 22, 27, 36, 71, 107, 148, 226. 



Endolymph ('iv^ov ; lymph) The fluid contained in the membranous 

 labyrinth, 219, 256, 304. 



Endoparasite (evbov parasite) An internal parasite, 17, 28, 39, 47. 



Endophragmal system, in the Crayfish A series of hard parts, which in- 

 completely roof over the sternal sinus in the thorax, 90. 



Endoplasm (evdov, TrXdvpa, anything formed), in Amoeba The internal 

 granular part of the body, 8. 



Endopodite (evSov; TTOUS, TTO^OS, a foot), in the Crayfish appendages The 

 internal part of the forked end, 84. 



Endosarc (ZvSov, o-ap, o-apxds, flesh), in Protozoa The granular, more 

 fluid, internal part of the protoplasm, 13, 16. 



Endoskeleton An internal skeleton. See Skeleton. 



Endothelium Simple squamous epithelium, lining the heart, vessel, and 

 lymphatic sinuses, 202. 



End-organs, 103, 174. 



End-plate, 92, 209, 216. 



Endostyle A medium ventral thickening in the wall of the pharynx of 

 lower chordates, 139. 



Ends Anterior and posterior, 28, 311 ; Oral and aboral, 19. 



