Ex-o-skel´e-ton [Gr. exo, outside; skeleton, dried body.] External skeleton; bony or horny hardening of the integument.
Fla-gel´lum [Lat., dim. of flagrum, scourge.] A slender protoplasmic extension of a cell, for purposes of locomotion.
Fo-ram-i-nif´e-ra [Lat. foramen, opening; fero, bear.] A division of protozoans secreting a shell perforated by many minute apertures.
Fos´sil [Lat. fodio, dig.] Any organic body so situated in the earth, and so buried in solid rock or in earthy deposits, as to be capable of indefinite preservation.
Gan´gli-on [Gr. ganglion, tumor.] A swelling that consists of an aggregation of nerve-cells. It receives and discharges nervous impulses and serves to stimulate psychical and organic activities.
Ga-noi´de-i [Gr. ganos, brightness; eidos, appearance.]
Gas-ter-op´o-da [Gr. gaster, stomach; pous, foot.] Including all snails and slugs.
Gas´tru-la [Dim. of Lat. gaster, stomach.]
Gem´mæ [Lat. buds.]
Geph-y-re´a [Gr. gephyra, bridge.] A division of worms with an œsophageal nervous ring and ventral chord; no distinct segments or legs; a terminal or dorsal anus.