GLOSSARY. 635 



His-tol'o-gt (Gr. Idstos, a web ; logos, a diBOOurse). The study of the tissues ; 



more especially of the minuter elements of the body. 

 Hol-o-oeph'a-li (Gr. Iwloa, whole; iep/iale, head). A sub-order of the 



MasmoirancMi, comprising the GbmUBrm, 

 Hol-o-met-a-bol'io (Gr. Tiolos, whole ; metabole, change). Applied to insects 



which undergo a complete metamorphosis. 

 Hol-o-sto'ma-ta (Gr. holos, whole ; stoma, mouth). A division of Gasteropo- 



dotia Molluscs, in which the aperture of the shell is roundedj or "entire." 

 Hol-o-thtj-roi'de-a (Gr. holos; thura, door ; and eidos, form). An order of 



Schitiodermata comprising the Trepangs. 

 HoM-o-OEK'OAi. (Gr. homos, same ; ierfos, tail). Applied to the tail of Kshes 



when it is symmetrical, or composed of two equal lobes. 

 Ilo-Mo -GE'NE-ons. 

 Ho-mo-gan'gli-ate (Gr. homos, same ; gagglion, a knot). Having a nervous 



system in which the ganglia are symmetrically arranged (as in the Annu- 



tosa, for example). 

 Ho-Moi'o-GODS (Gr. homos ; and logos, a discourse). Applied to parts which 



are constructed upon the same fundamental plan. 

 Ho-mo-mor'phous (Gr. homos ; and Tnor^he, form). Having a similar external 



appearance or form. 

 Hn'MB-BTJS. The bone of the upper arm Cbrachium) in the Vertebrates. 

 Hy'a-line (Gr. hualos, crystal). Crystalline or glassy. 

 Htd'-a-tids (Gr. hvdatis, a vesicle). The vesicle containing the larval forms 



{Echinococ(^) of the tapeworm of the dog. 

 Hy'dea-fobm. Eesemblmg the common fiesh-water polype {Eydra) in form. 

 Ht'dea. 

 Hy-dro-oau'lcs (Gr. hudra, a water-serpent ; and haulos, a stem). The main 



stem of the eoenosarc of a Bydrozoin. 

 Hy'-dro-otsts (Gr. hudra ; and leustis, a cyst). Curious processes attached to 



thecceno8arcoftheP%sopAoWiias, and termed "feelers" {FiXlder smi Taster 



of the Germans). 

 Hy-de<e'ci-dm (Gr. Imdra; and oikos, a house). The chamber into which the 



eoenosarc in many of the Calyccmhorida, can be retracted. 

 Hy-dsoi'da (Gr. hudra ; and eidbs, form). The sub-class of the Hydrozoa, 



which comprises the animals most nearly allied to the Hydra. 

 Hy-deo-phyi'li-a (Gr. hudra; and phullon, a leaf). Overlapping append- 

 ages or plates which protect the polypites in some of the oceanic Hydrosoa 



(Ualycophorid^ and Physophoridm). They are often tei-med " bracts," and 



are the Deekstueke of the (Germans. 

 Hy-deo-ehi'za (Gr. hudra; and rhirn, root). The adherent base or proximal 



extremity of any Hydrozom. 

 Hy-deo-so'ma (Gr. hudra; and soma, body). The entire organism of any 



Hydrozoon. 

 Hy-deo-the'ca (Gr. hudra; and thele, a case). The little chitinous cups in 



which the polypites of the Sertularida and Campanularida are pro- 

 tected, 

 Hy-deo-zo'a (Gr. hudra ; and zoon, animal). The class of the GceUrderata; 



which comprises animals constructed after the type of the Hydra. 

 Hy-meit-op'tbe-a (Gr. humen, a membrane ; pteron, a wing). An order of 



Insects (comprising Bees, Ants, etc.) characterized by the possession of four 



membranous wings. . tr 



Hy'oid (Gr. Y/ eidos, form). The bone which supports the tongue inVer- 



tebrates, and derives its name- from its resemblance in man to the Greek 



1 pt'tiGr V 

 Hy'po-sto'me (Gr. hupo, under: stoma, mouth). The upper lip, or " labrum," 



of certain Crustacea (e. g., Trilobites). „ , . ,».,.,, 



Hy-ea-coid'e-a (Gr. hMrax, a shrew; mdos, form). An order of the Mam- 

 malia constituted for the reception of the single genus Hyrax. 



Ioh-tht-o-dok'y-lite (Gr. ioUhus, flsh; doru, spear; Uthos, stone). The 

 fossil fin-spines of Fishes. 



