=Greg-a-rin´i-dæ= [Vid. Gregarina.] More or less elongated amœba-like Protozoa, having a well-defined cell-wall, and a “subcuticular” system of muscular fibrillæ; nucleus, but no contractile vacuole; reproduction by encystment and subdivision of the central cell mass or protoplasm, by which shelly psorosperms are formed and from which escape the moner-like young, which undergo a metamorphosis. =Gro´mi-a o-vi-form´is= [Lat. _gromia_; _ovum_, egg; _forma_, form.] A characteristic imperforate foraminifer. =Gym-no-phi´o-na= [Gr. _gymnos_, naked; _ophis_, serpent] =Gym-no-sper´mæ= [Gr. _gymnos_, naked; _sperma_, seed.] Plants whose seeds are not contained in a closed seed-vessel, as Cycads and Conifers. =Hap´a-le= [Gr. _hapalos_, gentle.] =Ha-pal´i-dæ= [Gr. _hapalos_, gentle] A family of New World monkeys including the Marmosets. =Hel-i-co-nid´æ= [N., < _heliconius_, of Helicon; idæ.] A family of butterflies. =Hes-per-or´nis= [Gr. _hesperos_, western; _ornis_, bird.] Cretaceous carinate birds with rudimentary wings, short tail, and pointed teeth implanted in grooves. =Hip-po-pot´a-mus= [Gr. _hippos_, horse; _potamos_, river.] =Hol-o-ceph´a-li= [Gr. _holos_, whole; _kepale_, head.] A subdivision of Elasmobranchii in which the suspensorium of the lower jaw is continuous with the cranium, as chimæroids, etc. =Hol-o-thu-roi´de-a= [Gr. _holos_, whole; _thouros_, rushing.] Worm-like echinoderms, with skin-like integuments, and circum-oral tentacles; including sea-cucumbers, sea-slugs, etc. =Ho-min´i-dæ= [Lat. _homo_, man; idæ.] A family of primates restricted to mankind. =Hy´a-lo-plasm= [Gr. _hyalos_, glass; _plasma_, < _plasso_, form.] =Hy´dra= [Gr. _hydra_, Lernæan serpent, < _hudor_, water.] A fresh-water polyp, having the form of a cylindrical tube, surrounded at the mouth with a circle of thread-like tentacles, by which it captures its prey. =Hy´droid= [Gr. _hudor_, water; _eidos_, form.] Resembling the _hydra_; pertaining to the Hydroidea. =Hy-dro-zo´a= [Hydro-; _zoon_, animal.] Cœlenterates including Hydroids and jelly-fishes. =Hy-lob-a-ti´næ= [Gr. _hylobates_, one who walks the wood.] An Asiatic subfamily of apes; the long-armed apes or gibbons. =Hy-lob´a-tes= [Gr. _hylobates_.] A gibbon,—an Asiatic ape. =Hy-ra-coi´de-a= [Gr. _hyrax_, shrew-mouse; _eidos_, appearance.] =Ich-thy-or´nis= [Gr. _ichthys_, fish; _ornis_, bird.] Cretaceous toothed birds of tern-like form, with socketed acute teeth, and bi-concave vertebræ =Ich-thy-o-sau´ri-a= [Gr. _ichthys_, fish; _sauros_, lizard.] =Id´i-o-blast= [Gr. _idios_, individual; _blastema_, sprout.] =In-fu-so´ri-a= [Lat. _in_, into; _fundo_, pour.] So called because including many animalcules that occur in infusions of decaying substances. =In-sec´ta= [Lat. _in_, into; _seco_, cut.] =In-sec-tiv´o-ra= [Lat. _insectum_, insect; _voro_, devour.]