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; ot/ieo, I expel.) The act in which a denser fluid is 



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

 ExiTiiM. (From the Latin, signifying the skin of a serpent) The skiu 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 Latiu/</.sciCK/Ms.) A small bundle. 



Filiform. (Lat. ./j7k;h, a thread ; /orwa, a shape.) Thread-shaped. 



FissiPAROus. (Lat. fimh, I cleave ; pario, I jiroduce.) The multiplication of a 

 species by the sclf-cleavagc of the individual into two parts. 



Flabei.mform. {lAM.^flabellum, a fi\n.) Fan-shaped. 



Flaoellum. (From tlic Latin.) An ajipendage to the legs of the Crustacea re- 

 sembling a whip. 



Flexors. (L&t.^flecto, I bend.) The muscles employed in bending a limb. 



Plexitous. a bonding course. 



FoLiACEors. (Lat../()//«Hi, a leaf.) Shaped or aiTanged like leaves. 



Follicle, {hax.f'olliculus, a small bag.) ^linute secreting bags which commonly 

 open upon mucous membranes. 



FossiLiFERors. (Ijat. fossilis, any thing dug out of the earth ; andyiro. I bear.) 

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

 remains Geologists now restrict the term Fossil. 



FccivoRous. (Lat. /mciw, sea-weed J and ( wo, T devour.) Animals which subsist 

 on sea-weed. 



Fi;siFORM. (Lat. /MA-M.S, a spindle; and /or/nn, a shape.) Spindle-shaped. 



Gaxgliok. (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. _</<'Hi/Ha, a bud; /x/r/o, I bring forth.) Propagation by the 

 growth of the young, like a bud tVom the jiarent. 



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

 when they resemble ciliated monads. 



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



Germ-cell. Tlie fii-st nucleated cell tiiat appears in the impregnated ovimi, after 

 the reception of the spermatozoon and the ilisap]H\u-ance 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 termed the " primary 

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



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

 of the derivative gorm-oells and the yolk which thoy have assimilated. 



Germ-vesicle or Germinal vesicle. The nucleated ooU whioh is the first formed 

 and most essential part of the ovum ; it is surrounded by the yolk, and usually 

 passes to the poriphory of that part prior to impregnation. 



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

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

 yolk is so assiniilatoil, in otliers (sepia, e. g.) only a small portion, the romaindcr 

 being the " food-ydk," and absorbod liy the fntin-c embryo or young animal. 



Gi.oDOSE. (Lat. (7/o/>i/.<, a globe.) Globe-shaped. 



Glossologt. (Gr. ylosse, the tongue ; Gr. logos, discourse.) The science of 

 scientific language. 



Granules. (Dim. of ^ranum, a grain.) Little grains. 



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



ILvrsTFLLATE. (I^at. haiirio, I drink.) The structure of mouth adapted for 

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

 mouth. 



Helmisthoio, (Gr. helmins, an intestinal worm.) Worm-shaped. 



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