ZODIACAL 



350 



ZYMOTIC 



>n. Spring: Aries, Taurus, Gemini. 

 Summer: Cancer, Leo, Virgo. Autumn: 

 Libra, Scorpio, Sagittarius. Winter: Cap- 

 ricorn, Aquarius, Pisces. The signs and 

 the constellations of the Zodiac do not 

 now agree, owing to the precession of the 

 equinoxes. 



Zodiacal, (z5-di'a-kal). [Zodiac, q.v.] Z. 

 light: a ring of nebulous matter seen near 

 the ecliptic. Z. conttellationt: the twelve 

 constellations through which the Sun passes, 

 at one time identical with the signs of the 

 Zodiac; and having still the same names. 



Zoea. (zo'e-a). [Gk. toe, life.]=Zoe: the 

 earliest form of shore-crab, has two sessile 

 eyes. 



Zoisite, (zo'i-sit). A dark variety of epidote. 



Zonary placenta, (zo'na-ri). [Gk. tone, 

 belt] A deciduous placenta, in which the 

 villi of the chorion are arranged in a zone 

 or belt. 



Zones of the earth. Torrid Z.: the central 

 zone, extending 23)* 



N. and S. of the equa- 

 tor. Two frigid Z*.: 

 extending 234" round 

 the poles. Two tem- 

 perate Zt.: buiH 

 the torrid and frigid 

 zones. 



Zones of life, Littoral: 

 between high and low 

 watermarks. Lamin- 

 anan; between low 

 water and 15 fathoms. 

 15 and 50 fathoms. 

 50 fathoms. 



Coralline: 

 Dttp Sta Coral: below 



Zooid, (zo'oid). [Gk. soon, animal; eidot, 

 form.] A general term for any organisms, 

 such as polyps, 7. r.: the individual organism 

 produced by gemmation. 



Zoological anatomy. The science of the general 

 structure and adaptation of animals. 



Zoology, (zd-ol'6-ji). [Gk. toon, animal; logos, 

 discourse.] The science of animal life: the 

 branch of biology relating to the nature and 

 habit of animals. Z. of 6trd=Ornithology. 

 Z. of,fishet= Ichthyology. Z. ofinttctt En- 

 tomology. 



Zoon, (zoon). [Gk. roon, animal.] An indi- 

 vidual animal, whether mammal, bird, &c. , 

 or a niuuiK-r of zooids. 



Zoophagoida, (zo-of-a-goi'da). [Gk. zoon, ani- 

 mal; phago, I eat.] Beings subsisting on 

 animal and azotised vegetable food. 



Zoophyta, (zo-ofi-ta). [Gk. coon, animal; 

 phylon, plant.] A general term for radiate 

 animals, or for those having any resemblance 

 in form to planU. v. Zoophytes. 



Zoophytes, (zo'o-fits). [Gk. soon, animal; 



phyton, plan t.]= Protozoa and 

 Ccelenterata: first used to ex- 

 preM the plant-like form of 

 animal life: sometimes mis- 

 taken to mean something in- 

 termediate between plant* and 

 animals. GUutZt.=Ilya.lone- 

 mad, q.v. Ilydroid Zt.= 

 Hydroida, q.v. Zoophyta. 



Zoospores, (zoos-porz). [Gk. zoon, animal: 

 tporn, seed.] Bulb-like products of vegetative 

 growth, in algae, mould*, &c. 



Zoothome, (zo'o-thom). [Gk. toon, animal: 

 thoMot, heap.] The compound animal luaos 

 of coral polyps: a living sheet of animal 

 matter, fed and nourished by numerous 

 mouths and as many stomachs; formerly 

 called Zoophyte. 



Zootica, (zo-otl-ka). A lizard belonging to 

 I^certa, q.v. Z. riipar=Scaly lizard. 



Zootoka, (zo-ot o-ka). Used by Owen as equi- 

 valent to Mammalia. 



Zootomy, ( zo-ot '6-mi ). [Gk. zoon, animal: 

 tome, section.] Anatomy of animals as dis- 

 tinct from that of the human body. Z. of 

 birdt = Ornithotomy. Z. of inttctt=: Ento- 

 </". Phytotomy. 



A bright scarlet star-fish, first 

 discovered in 1869. 



Zostera, (zos'tcr-a). (Gk. totter, girdle.]=Grasi 

 wrack: a plant belonging to Zosteraoee. 



ZosKracess, (zos-te.r-a'se-<<). [Zostera, o.r.]a 

 Sea-wracks: marine plants, resembling sea- 

 weeds, with small naked flowers, found at 

 the bottom of the sea, 



IjfgasU, (zi-gu'na). Z. malleut = Uammer- 

 i.i i'ii .i .-<ii.ii K. 



Zygantruro, (zi-gan'trum). [Gk. sygon, yoke; 

 anfruni, cave.] A cavity in the vertebra; of 

 serpents. 



Zygapophysis, (zl-ga-pofi-sis). [Gk. tygon, 

 yoke; apophytii, outgrowth.] Processes of 

 vlisB% by means of which they are con- 

 nected. 



Zygoma, (zf-g<yma)i [Gk. tygonu, yoke.] The 

 arch at the side of the skull. 



Zygophyllacese, (zi-go-fil-la'se-C). [Zygoph.vl- 

 lum, typical genus.]=Bean capers: trees and 

 shrubs, with very hard wood, belonging to 

 Uutales. 



Zygopteris, (zl-gop'ter-is). A fossil leaf stalk. 



Zygosphcne, (zi'g6-sfCn). [Gk. zyyon, yoke: 

 sphen, Wedge.] A wedge-like projection of 

 the vertebra of snakes. 



Zygospore, ( zi'go-spor ). [Gk. sygon, yoke; 

 spora, seed.] Formed of small cells break- 

 ing into one larger, as in fungi. 



Zymotic diseases, (zi-mot'ik). (Gk. zymosis, 

 fermentation.] Those communicable by con- 

 tagion of a fermentable virus. 



