GLOSSARY. 673 



transmitted to a centre, and reflected so as to produce contraction of a muscle 



without sensation or volition. 

 ExosMosE. (Gr. ex, out of; otheo, I expel.) The act in which a denser fluid is 



expelled from a membranous sac by the entry of a lighter fluid from without. 

 ExcviUM. (From the Latin, signifying the skin of a serpent.) The skin which is 



shed in moulting. 

 ExuviAL. Any part which is moulted. 



Facet. (From the French.) A flat surface, with a definite boundary. 



Fascicle. (From the IjHi'm fasciculus.) A small bundle. 



Filiform, (hat. Jilum, a thread ; forma, a shape.) Thread-shaped. 



FissiPAROUS. (Lat. findo, I cleave ; pario, I produce.) The multiplication of a 

 species by the self-cleavage of the individual into two parts. 



Flabelliform. (LatJlabeUum, a fan.) Fan-shaped. 



Flagellum. (From the Latin.) An appendage to the legs of the Crustacea re- 

 sembling a whip. 



Flexors. (Lat. j^ecto, I bend.) The muscles employed in bending a limb. 



Flexuous. a bending course. 



Foliaceods. (Lat. folium, a leaf.) Shaped or arranged like leaves. 



Follicle. (Lat. folUculus, a small bag.) Minute secreting bags which conmionly 

 open upon mucous membranes. 



FossiLiFEROus. (Lat. fossHis, any thing dug out of the earth ; and f era, I bear.) 

 Applied to the strata which contain the remains of animals and plants, to which 

 remains Geologists now restrict the term Fossil. 



FucivoRODS. (Lat. /?/cM5, sea-weed; and roro, I devour.) Animals which subsist 

 on sea-weed. 



Fusiform. (Lat. /m5M5, a spindle; andybrnicr, a shape.) Spindle-shaped. 



Ganglion. (Gr. gagglion, a knot.) A mass of nervous matter, forming a centre 

 from which nervous fibres radiate. 



Gastropoda. (Gr. gaster, stomach ; pons, a foot.) That class of molluscous 

 animals which have the locomotive organ attached to the under part of the body. 



Gemmiparous. (Lat. gemma, a bud; par/o, I bring forth.)' Propagation by the 

 growth of the young, like a bud from the parent. 



Gemmule. (Dim. of gemma.) The embryos of the radiated animals at that stage 

 when they resemble ciliated monads. 



Germen. In plants, the part answering to the ovarium in animals. 



Germ-cell. The first nucleated cell that appears in the impregnated ovum, after 

 the reception of the spermatozoon and the disappearance of the germinal vesicle. 

 The germ-cell assimilates the surrounding yolk and propagates its kind by spon- 

 taneous fission, whence the first or parent-cell has been tci'med the " primary 

 germ-cell," and its progeny the " derivative germ-cells." 



Germ-mass. The material prepared for the formation of the embryo, consisting 

 of the derivative germ-cells and the yolk which they have assimilated. 



Germ-vesicle or Germinal vesicle. The nucleated cell which is the first formed 

 and most essential pai-t of the ovum ; it is surrounded by the yolk, and usually 

 passes to the periphery of that part prior to impregnation. 



Germ-yolk. That portion of the primary yolk of the egg which is assimilated by 

 the germ-cells in the formation of the germ-mass. In some animals the whole 

 yolk is so assimilated, in others (sepia, e. g.) only a small portion, the remainder 

 being the " food-yolk," and absorbed by the future embryo or young animal. 



Globose. (Lat. globus, a globe.) Globe-shaped. 



Glossology. (Gr. glosse, the tongue ; Gr. logos, discourse.) The science of 

 scientific language. 



Granules. (Dim. of granum, a grain.) Little grains. 



Gynglymoid. (Gr. gigglumos, a hinge.) A joint formed for motion on one plane. 



Haustellate. (Lat. haurio, I drink.) The structure of mouth adapted for 

 drinking or pumping up liquids ; also the insects which possess that kind of 

 mouth. 



Helminthoid. (Gr. helmins, an intestinal worm.) AYorm-shaped. 



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