GLOSSARY. 335 



His-tol'o-ot (Gr. hisios, a web ; logos, a discourse). The study of the tissues ; 



more especially of the minuter elements of the body. 

 Hol-o-obph'a-li (Gr. Iwlos, whole; Icephale, head). A sub-order of the 



Masmobranehii, comprising the Chimara. 

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



which undergo a complete metamorphosis. 

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



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

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



Echinodennata comprising the Trepangs. 

 Hom-o-oee'oal (Gr. Tiomos, same ; leerJms, tail). Applied to the tail of Fishes 

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



Ho-MO -GE'NE-OUS. 



IIo-mo-gak'oli-ate (Gr. homos, same ; gagglion, a knot). Having a nervous 

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

 iosa, for example). 



Ho-MOL'o-GO0s (Gr. homos ; and logos, a discourse). Applied to parts which 

 are constructed upon the same fundamental plan. 



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

 appearance or form. 



Hd'me-ktis. The bone of the upper arm {Iradium) in the Vertebrates. 



Hr'A-LiNE (Gr. hualos, crystal). Crystalline or glassy. 



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

 {Mchinoeocd) of the tapeworm of the dog. 



Hy'dha-fobm. £esembhng the common fresh-water polype {Hydra) in form. 



Hy'dba. 



Hr-DKO-OAu'LTis (Gr. hudra, a water-serpent ; and hmlos, a stem). The main 

 stem of the coenosaro of a Sydrozoon. 



Ht'-deo-otsts (Gr. hudra ; and hustis, a cyst). Curious processes attached to 

 the coenosarc of the Fhysophoridw, and termed " feelers " {Fuhler and Taster 

 of the Germans). 



Ht-de(e'oi-um (Gr. hudra; and oileos, a house). The chamber into which the 

 coenosaro in many of the Cal/ycimhorid<ie, can be retracted. 



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

 which Qomprises the animals most nearly allied to the Hydra. 



Ht-deo-phtlu-a (Gr. A«dra/ odA. phullon, a leaf). Overlapping append- 

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

 (CalycophoridcB and Physophoridm), They are often termed " bracts," and 

 are the Deckstiiche of the Germans. 



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

 extremity of any Hydrozobn. 



Hr-nEO-so'MA (Gr. hudra ; and soma, body). The entire organism of any 

 Hydrozobn, 



Hy-deo-the'oa (Gr. JK<ira ; and <A«i«, a case). The little chitinous cups in 

 which the polypites of the Sertularida and Campanularida are pro- 

 tected. 



Hy-nEo-zo'A (Gr. hudra ; and isobn, animal). The class of the Ooelenterata, 

 which comprises animals constructed after the type of the Hydra. 



Hy-mek-op'teb-a (Gr. hv/men, a membrane ; pteron, a wing). An order of 

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

 membranous wings. 



IIy'oid (Gr. Y / eidos, form). The bone which supports the tongue in Ver- 

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

 letter Y. 



Ht'po-stome (Gr. hupo, under: stoma, mouth). The upper lip, or " labrum," 

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



Hy-ea-ooid'e-a (Gr. hurax, a shrew ; ddos, form). An order of the Mam- 

 malia constituted for the reception of the single genus Hyrax. 



Ioh-thy-o-doe't-lite (Gr. ichthus, fish ; doru, spear ; Uthoe, stone). The 

 fossil fin-spines of Fishes. 



