ECHINOTHTTRIA 



111 



EEL 



Acanthocephala, found in intestinal canal 

 of birds and fishes. 



Echinothuria, (e-ki-no-thu'ri-a). [Gk. echinos, 

 spiny ; thurios, covering. ] A fossil sea- 

 urchin, found in Upper Chalk rocks. 



Echinothuridae, (e-ki-no-thu'ri-de). [Echino- 

 thuria, q.v.; Gk. eidos, form.] A family of 

 sea-urchins, comprising the extant genera 

 Calveria and Phormosoma, and the fossil 

 Echinothuria. 



Echinozoa, (e-ki-no-zo'a). [Gk. echinos, spiny; 

 zoon, animal. ]=Annuloida, q.v. 



Echinus, (e-ki'nus). [The Latin name.] =Sea- 

 urchins : globular, with spiny body, covered 

 with calcareous plates; mouth a simple ori- 

 fice with five sharp teeth, each enclosed in a 

 large jaw. 



Echium, (ek'i-um). [Gk. eckis, viper. ]=Bug- 

 loss : an herb belonging to Boraginacese. 



Echo, (ek'6). [The Latin word.] The repe- 

 tition of a sound arising from its reflection 

 from some large surface usually not less than 

 100 feet distant. 



Ecitons:= Foraging ants=Army ants : having 

 no fixed home, but hunting in vast numbers 

 after grasshoppers, spiders, &c. ; the eyes are 

 often imperfect, and sometimes absent. 



Eclipse, (ek-lips'). [Ekleipsis, the Greek 

 word.] The disappear- 



ance of a planet or a 

 star, the sun or the 

 moon, by the removal 

 of the source of light, 

 or the interposition of Eclipse. 



an opaque body. Annular E.: when the 

 centre of the object only is obscured, and the 

 whole circumference is visible. Partial E.: 

 in which a portion only is eclipsed. 



Ecliptic, (ek-lip'tik). [Eclipse, q.v.] The 

 great circle of the heavens in which the sun 

 appears to move, and on or near which the 

 moon must be at the time of an eclipse. 



Ecteron, (ek'ter-on). [Gk. ek, out of ; dermos, 

 skin.] Used" for the outer layer of skin, 

 whether epithelium or epidermis. 



Ectocyst, (ek'to-sist). [Gk. ektos, outside; 

 kystis, bladder.] The outer cell of a polype, 

 a chitinous or calcareous membrane. 



Ectoderm,(ek'to-derm). [Gk.ektos, outside; der- 

 ma, skin.] Outer layer in Ccelenterata, from 

 which the organs of motion are developed, 

 sub-divided into ecderon and enderon. 



Ectopistes, (ek-to-pis'tes). [Gk. ektopizo, I 

 remove.] E. migratorius=Psisaengei- pigeon. 



Ectosarc, (ek'to-sark). [Gk. ektos, outer; 

 sarx, flesh.] The outer layer of the Amoeba. 



Ectozoa, (ek-to-zo'a). [Gk. ektos, outside; 

 zoon, animals.] Parasites living on the 

 outer surface of other animals, cf. Entozoa. 



Edaphodus, (e-daf'o-dus). [Gk. edaphos, foun- 

 dation; odous, tooth.] A fish, belonging to 

 Holocephali, known by fossil remains of jaws 

 and spines, found in Tertiary rocks. 



Eddy, (ed'di). [A.-S. ed, back; ea, stream; 

 or Ice. yda, whirlpool.]=Vortex= Whirl: a 

 stream which moves in either a spiral or 

 circular direction. 



Eielforsite, '. An impure variety of "Wollas- 

 tonite. 



Edelite=Prehnite, q.v. 



Edenite. A variety of Amphibole, q.v. 



Edentata, (e-den-ta'ta). [L. e, without ; dens, 

 tooth.] Sloths, Ar- 

 madillos, &c.: ani- 

 mals, belonging to'- 

 Mammalia, in? 

 which the teeth are 1 

 either wholly or = 

 partially absent : in- ^- 

 eludes also the me-*" 

 gatherium, &c. Edentata. 



Edentula, (e-den'tu-la). [L. e, without ; dens, 

 tooth.] Owen's term for Ant-eaters. 



Edentulous, (e-den'tu-lus). [Edentula, q.v.]= 

 Toothless. 



Edestes, (e-des'tes). [Gk. edestes, devourer.] 

 A fish, known only by fossil spines, found in 

 coal in Indiana, named from the supposition 

 of its being a shark. 



Edible, (ed'i-bl). [L. edo, I eat.] The follow- 

 ing is a list of the genera, some of the species 

 of which are edible. E. Fucacece : Laminaria, 

 Sargassum, Alaria, Durvillsea, Fucus, Scy- 

 tosiphon. E. fungi : chiefly Agaricus. E. 

 lichens : Cetraria, Gyrophora, Cenomyce, 

 Parmelia, Peltigera, Stictypulmonacea. E. 

 sea-weeds : Plocaria, Gelidium, Chondrus, 

 Rhodomenia, Iridaea, Laurentia, Fucus. 



Edingtonite. A mineral, chiefly hydrous sili- 

 cate of aluminum and barium. 



Edriasterida, ( ed-ri-as- tori-da ). [Gk. hed- 

 raios, sessile ; Asteridea, q.v.] Extinct ani- 

 mals, belonging to Echinodermata, found 

 only in Palaeozoic rocks. 



Edriopthalmia, (ed-ri-op-thal'mi-a). [Gk. 

 hedraios, sessile; ophthalmos, eye.]=Hedrseo- 

 phthalmia = Tetradecapoda : a division of 

 sessile-eyed Crustacea, including Amphi- 

 poda and Isopoda, aquatic representatives 

 of wood-lice. 



Educabilia, ( ed-u-ka-bil'i-a ). [L. educo, I 

 educate ; habilis, suitable for.] Term used 

 by Bonaparte, q.v., for a portion of Mam- 

 malia, including Primates, Ferae, Pinnipedia, 

 Cete, Belluae, Pecora. 



Educt, (e'dukt). [L. educo, I draw out.] A 

 chemical term used to express an already 

 existing compound, separated, in the course 

 of chemical operations, from others in which 

 it had been included, cf. Product. 



Edulcoration, (e-dul-kor-a'shun). [L. e, out : 

 dulcorare, to sweeten.] The separation of 

 insoluble matter from soluble by washing, 

 used where the insoluble only is preserved. 



Edward's (Milne) classification of animals. 

 Osteozoaria=Vertebrata. 

 Entomoza=Anellata : insects, &c. 

 Malacozoaria =Mollusca. 

 Zopphytes=Radiata. 



Edwardsite=Monazite. 



Eel, (el), [m, the A.-S. word.]=Mura3na= 

 Anguilla : a fresh-water fish, with cylindrical 

 body, belonging to the Teleostei. Conger E. 

 z=Conger vulgaris. Electrical E.=Gymno- 

 tus: an eel- like fish of S. America, which has 

 the power of giving electrical shocks to per- 

 sons touching it. Glass E. v. Glass-eels, 

 Sand .E'.rrArnmodytes tobianus. 



