ICELAND 



179 



IGUANA 



forms, v. Water. 7. agrg=Glacial epoch. 

 Iceberg: pieces of ice, sometimes miles in 

 length, floating about in Polar seas; broken 

 off glaciers when these reach deep water; v. 

 Berg. /. blink=Glajcier. 1. plant=M.e$em- 

 bry anthem urn crystallinum. 



Iceland, (Island). /. spar : a crystalline 

 variety of calcite; causes double refraction 

 of light; named from having been found in 

 Iceland. /. moss=Cetraria islandica, from 

 which Lichenin is obtained. 



Ichneumon, (ik-nu'mon). [Gk. ichneumon, 

 tracker.] = Viverra 

 icb :z=Herpestes ich: 

 a small carnivorous 

 mammalian animal, ' 

 somewhat resem- ' 

 bling the civet ; Ichneumon, 



named from its habit of following the croco- 

 dile, &c. 7./ies=Ichneumonid8e: insects be- 

 longing to Hymenoptera, including several 

 genera; larvae parasitic on other insects. 



Ichnites, (ik-ni'tez). [Gk. ichnos, footstep.] 

 Fossil traces of footmarks, v. Lithichnozoa. 



Ichnocarpos, (ik-no-kar'pos). [Gk. ichnos, 

 trace; karpos, fruit.] A plant, belonging to 

 Apocynaceas. 



Ichnolithology,(ik-no-lith-oro-ji). [Gk. iclinos, 

 track; logos, discourse. ]= Ich nology: science 

 of fossil footmarks, v. Lithichnozoa. 



Ichth'in, (ik'thin). [Gk. ichthys, fish.] A 

 nitrogenous constituent of fish-eggs. 



Ichthyocolla, (ik-thi-o-kol'la). [Gk. ichthys, 

 fish ; kolla, glue.]=Fish glue = Isinglass, 



iSTthyodorulites, (ik-thi-5-dor'o-lIts). [Gk. 

 ichthys, fish; dory, spear; lithos, etone.J 

 L/arge bony fin-spines, found fossil in the 

 Lias. 



Ichthyolites, (ik'thi-o-lits). [Gk. ichthys, fish; 

 lithos, stone.]=Fossil fishes: fossil remains 

 of fishes. 



Ichthyology, (ik-thi-ol'o-ji). [Gk. ichthys, fish.] 

 Natural history of fishes, v. Zoology. 



Ichthyomorpha,(ik-thi-6-mor / fa). [Gk. ichthys, 

 fish; morphe, shape. ]=Urodela, q.v. Newts, 

 &c: amphibious animals; also called tailed- 

 amphibia. 



Ichthyophis, (ik'thi-o-fis). [Gk. ichthys, fish; 

 ophis, serpent.] A fish, belonging to Gym- 

 nophiona; named from its snake-like form. 



Ichthyophthalmite, (ik-thi-of-thal'mit). [Gk. 

 ichthys, fish; ophthalmos, eye.]=Aix)phyllite, 

 q.v. 



Ichthyophthira, (ik-thi-of-thi'ra). [Gk.ichthys, 

 fish ; phtheir, louse.]=Epizoa: small crus- 

 taceans, the adult forms of which are found 

 parasitic on fishes; probably belong to Cope- 

 poda; a sub-division of Crustacea. 



Ichthyopsida, (ik-thi-op'si-da). [Gk. ichthys, 

 fish; opsis, appearance.] A primary division 

 - ' ' ' and 



amnion nor allantois. v. Vertebrata. 

 Ichthyopterygia, (ik-thi-op-ter-ij'i-a). [Gk. 



ichthys, fish; pteryx, wing.]=Ichthyosauria, 



q.v. v. Enaliosauria. 

 Ichthyornidae, (ik-thi-or'ni-de). [Ichthyornis, 



q.v.} Fossil birds, of which Ichthyornis is 

 the type. 



Ichthyornis, (ik-thi-or'nis). [Gk. ichthys, 

 fish; ornis, bird.] A bird having teeth, 

 known by fossil remains; found in Upper 

 Cretaceous rocks of Kansas, in 1872, 



Ichthyornithes=IchthyorniiUe, q.v. 



Ichthyosauria, (ik-thi-6-saw'ri-a). [Ichthyo- 

 saurus, q.v.]=z 

 Fish-lizards : ex- 

 tinct aquatic and [ 

 carnivorous rep- 

 tiles, several 

 species of which Ichthyosauria. 



are known by fossil remains, found in Second- 

 ary strata, especiaily in Lias; with limbs 

 developed into paddles. 



Ichthyosaurus, ( ik-thi-o-saw'rus ). [ Gk. 

 ichthys, fish; sauros, lizard.] A large marine 

 reptile, known only by fossil vertebrae and 

 other bones, found in Oolite rocks. 



Ichthyotomy, (ik-thi-ot'o-mi). [Gk. ichthys, 

 fish ; tome, section.] Anatomy of fishes, v. 

 Zootomy. 



Icica, (i'si-ka). A resinous plant, belonging 

 to Amyridaceao. 



Icicane, (i'si-kan). [Icica, q.v.} A resin, ob- 

 tained from Icica. 



Icosahedron, (I-ko-sa-he'dron). [Gk. eikosi, 

 twenty; hedra, base.] A regular solid figure, 

 having twenty faces. 



Icosandria, ( I-kos-an'dri-a ). [ Gk. eikosi, 

 twenty; aner, man.] Plants having twenty 

 or more stamens, v. Linnean classification. 



Ideoelectrics, (id-e-5-el-ek'triks). Substances 

 such as sulphur, amber, &c. , which can be 

 electrified by friction. (Obsolete.) 



Ideographic, ( id-e-6-graf'ik ). [ Gk. idea, 

 figure ; grapho, I write.] Hieroglyphic 

 writing: writing by means of descriptive 

 symbols. 



Idocrase, (id'o-kras). [Gk. eidos, form; krasis, 

 rnixture.]=Vesuviamte : a mineral of the 

 garnet group; a silicate of alumina, lime, 

 and iron, crystallising in pyramids. 



Idothea, (i-doth'e-a)=Box-slater: a crustacean 

 animal belonging to Isopoda. 



Idrialite, (id'ri-a-lit). [Idria.] A combustible 

 mineral; an impure variety of cinnabar, 

 named from being found in the mines of 

 Idria. 



Igasurine, (ig-a-su'rin). An alkaloid principle 

 found in Nux-vomica; probably =Brucine. 



Iglite, (iglit)=Arragonite, q.v. 



Ignatia, (ig-na'shi-a). A plant belonging to 

 Loganiacese. /. amara: St. Ignatius's 

 beans. 



Igneous, (ig'ne-us). [L. ignis, fire.] Pro- 

 duced by fire: related to, or connected with, 

 the action of fire. 7. rocis=Fused rocks: 

 granite, syenite, trap, basalt, trachyte, lavas, 

 and volcanic rocks. 



Ignis fatuus, (ig'nis fat'G-us). [The Latin 

 name.] A meteor, seen in marshy districts: 

 possibly ignited phosphoretted hydrogen. 



Ignition, (ig-nish'un). [L. ignis, fire.] Ren- 

 dering a solid luminous by the application 

 of heat. 



Iguana, (ig-wa'na). [The Spanish name.]= 



