868 GLOSSARY OF TECHNICAL TERMS. 



Ectoplasm. Gr. ectos, outside ; plasma, that which is formed. A term apphed by the 

 author for the distinction of the denser external substance of Infusoria and other 

 unicellular organisms. 



Efferent. Lat. ex, out ; fero, I bear. Conveying from the centre towards the periphery. 



Emarginate. Lat. e, out of; 7nargo, the margin. Having a notched or excised margin. 



Encuirassed. Fr. en, in ; cidr, leather. Having an indurated dorsal shield or cuirass. 



Encystment. Gr. ^;;, in ; ,('«j/(?i', a bladder. The phenomenon of becoming motionless 

 and excreting a membranous investment or cyst, common to the majority of the 

 Infusoria. 



Endochrome. Gr. endon, within; chroma, colour. The colouring matter developed 

 within the interior of many Protozoa and Protophytes. 



Endoderm. Gr. endon, within ; derma, skin. The interior of the two germinal cellular 

 layers common to all multicellular or Metazoic animal organisms, out of which are 

 developed the digestive and secretory systems, including the epithelium which lines the 

 alimentary tract and its connected glands. 



Endoparasitic. Gr. endon, within ; parasitos, parasite. Pertaining to an internal 

 parasite. 



Endoplasm. Gr. etidon, within ; plasma, that which is formed. A term applied by the 

 author for the distinction of the inner more fluid substance of the body of Infusoria 

 and other unicellular organisms. 



EndoplaST. Gr. endon, within ; plastos, formed or moulded. Title conferred by Huxley 

 on the structure homologous with the cell-nucleus as developed in the Infusoria 

 and other Protozoa. For an account and illustration of the more important modifica- 

 tions of this structure see vol. i. p. 73 et seq. and PI. L. 



EndOPLASTULE. Gr. endon, within ; plastos, formed. Title applied by Huxley to the 

 more solid particles developed singly or in varying number within, or in many cases 

 external to, the endoplast of Protozoic organisms, the same being regarded as 

 homologous with the nucleoli of the component cells of ordinary tissue structures. 



Endoral. Gr. endon, within ; Lat. os, oris, mouth. The fringe of cilia developed 



between the adoral and pre-oral series of certain Oxytrichidee (see woodcut, vol. ii. 



p. 760). 

 Endoskeletal. Gr. endon, within ; skeleton. Relating to the internal skeleton ; such as 



the bony human framework. 

 Epiblast. Gr. epi, upon ; blastos, germ. The external or outer germinal layer of the 



Metazoic embryo, equivalent to the Ectoderm. 

 Epithelium. Gr. cpi, upon ; thallo, I grow. The layer of cells being a modification of 



the epidermis which forms the surface of all mucous membranes. 

 Exoskeletal. Gr. exo, outside; skeleton. Relating to an external skeleton, such as 



the shell of a lobster. 

 Everted. Lat. eversio, a turning out. The condition of being turned out or backwards. 

 Evertile. Lat. eversio, a turning out. Capable of eversion or protrusion. 

 Fenestrate. XjaX.. fenestra, a window. Having holes or perforations. 



F1BRILL.E. Lat. dim. oifibra, a fibre. The delicate thread-like structures developed in 

 the cortical layer of many Infusoria, as also in the footstalk of Vorticella, and possessing 

 a rudimentary muscular function. 



Fieri llate. Lat. dim. oifibra, a fibre. Containing or enclosing fibrillae. 



Fimbriated. l.-A'i.fimbricr, threads or fringe. Fringed at the margin. 



Flagelliferous. 'L^K.flagellum, a whip or lash ; fero, I bear. Bearing one or more 

 flagella or lash-like appendages. 



