GLOSSARY. 3^1 



His-tol'o-qy (Gr. Mdos, a web ; logos^ a discourse). The stuuy of the tissues ; 



more especially of the minuter elements of the body. 

 Hol-o-ceph'a-li (Gr. Iiolos, whole ; kephale^ headj. A sub-order of the 



Masmobranc/iii^ comprising the ClUmcercE. 

 Hol-o-met-a-eol'ic (Gr. holos^ whole; metabole^ change). Applied to hiseets 



which undergo a complete metamoi'phosis. 

 HoL-o-STo'atA-TA (Gr. holos, whole; stoma, mouth). A division of Gasteropo- 



dons Molluscs^ in which the aperture of the shell is rounded, or " entire." 

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



.EchiJiodermata comprising the Trepangs. 

 Hom-o-cer'cal (Gr. hoinoe^ same ; Icerlcos, tail). Applied to the tall of Fishes 



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

 Ho-mo-ge'ne-ous. 

 Ho-mo-gan'gli-ate (Gr. liomos, same; gagglion^ a knot). Ilaviisg a nervous 



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



losa, for example). 

 IIo-MOL'o-GOus (Gr. homos ; and lor/os^ a discourse). Applied to parts which 



are constructed upon the same fundamental plan. 

 IIo-mo-mor'phous (Gr. homos / and 'morj>he, form). Having a similar external 



appearance or form. 

 Hu'ME-Kus. The bone of the upper arm Chrachium) in the Vertebrates. 

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

 Hyd'-a-tids (Gr. hudatis, a vesicle). The vesicle containing the larval forms 



{Echinococci) of the tapeworm of the dog. 

 Hy'dra-forh. Kesemblmg the common fresh-water polype {Bydra) in form. 

 Hy'dea, 

 Hy-dro-caii'lus (Gr. hndra^ a water-serpent ; and htulos^ a stem). The main 



stem of the ccenosarc of a Hydrozoi-n. 

 Hy'-deo-cysts (Gr. liudra ; and kustis^ a cystl. Curious processes attached to 



the ccenosarc of the Fhysophorida;^ and termed "" feelers " {FiihUr and TasttT 



of the Germans). 

 Hy-dece'ci-um (Gr. hudra ; and oikos, a house). The chamber into which the 



ccenosarc in many of the Valycripltoridce can be retracted. 

 Hy-droi'da (Gr. hudra ; and eidos^ form). The sub-class of the Hydrozoa. 



which comprises the animals most nearly allied to the Hydra. 

 Hy-dro-phyl'li-a (Gr. hudra; and phidlon, a leaf). Overlapping append- 

 ages or plates which protect the polypites in some of the oceanic '/^r/rosoa 



(Oalycop/i^ridce and Physophoridm). They are often termed '' bracts," and 



are the Deckstucke of the Germans. 

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



extremity of any Hydrozo'Jn, 

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



Hydrozo'i')}! . 

 Hy-deo-the'ca (Gr. hudra; and ^7'f;?Y, a case). The little chltinous cups in 



which the polypites of the Sertularida and Campamdarida are pi'o- 



tected. 

 Hy-dko-zo'a (Gr. hudra ; and zoun., animal). The class of the CmUnUrata, 



which comprises animals constructed after the type of the Hydra. 

 Hy-mei^'-op'ter-a (Gr. humen^ a membrane ; /'i^e?'o«, a wing). An order of 



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

 membranous wings. 

 Uy'oid (Gr. Y/ eUibs., forml. The bone which supports the tongue in Ver- 

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

 letter y. 

 Hy'po-stome (Gr. hupo, under ; stoma^ mouth). The upper lip, or " labrum," 



of certain Crustacea {e. g.., Trilobites). 

 My-ra-coid'e-a (Gr. hurax., a shrew ; eidos^ form). An order of the Mam- 

 malia constituted for the reception of the single genus Hyrax. 



Ioh-thy-o-t>or'y-lite (Gr. ichthus^ fish; doru^ spear; lithos, stone). The 

 fossil fin-spines of Fishes. 



