E C H 



[149] 



E G Y 



a pentagonal form. The whole of 

 the surface is marked with very 

 small depressions, of a circular 

 form, with central tubercles. 

 Parkinson. 



ECHINABA'CHNIUS. (from e%u>os and 

 a pa^yr}, Gr.) A genus of echini 

 belonging to the class Pleurocysti. 

 To this genus Klein gave the name 

 Arachnoides. 



ECHINOCO'BYS. A genus of fossil 

 echini tes, thus named by Leske, 

 belonging to the class Catocysti. 

 This genus comprises all those 

 echinites which Klein divided into 

 Galeae and Galeolse. There are 

 several species. 



ECHINODI'SCUS. The name given by 

 Breynius to a section of echini 

 belonging to the class Catocysti. 

 The echinodiscus is of a depressed 

 discoidal figure, whence it has its 

 name, nearly flat on both sides. 

 Echinodisci are found both recent 

 and fossil. There are many species. 



ECHTNOPHO'BA. A genus of stony 

 polypifers, recent, and found in the 

 sea of New Holland. The Echino- 

 pJiora is fixed, flat, expanded in a 

 rounded membrane, free, and bear- 

 ing the form of a leaf, finely stri- 

 ated on both sides. 



ECPYBO'SIS. The sect of Stoics taught 

 that catastrophes were of two kinds; 

 the cataclysm, or destruction by 

 deluge, which sweeps away the 

 whole human race, and annihilates 

 all the animal and vegetable pro- 

 ductions of nature; and theecpyrosis, 

 or conflagration, which dissolves the 

 globe itself. LyelL 



E'CLOGITE. A greenstone rock, com- 

 posed of green smaragdite and red 

 garnet. 



EDENTA'TA. The twelfth order of 

 the class mammalia, divisible into 

 four families ; Tardigradse, Gravi- 

 grada3, Dasypida3, and Myrmeco- 

 phagida?. 



EDENTA'TED. (edentatus, Lat. edente, 

 edentato, It.) Without teeth. 



EDI'JNGTOIUTE. A mineral, resembling 



some varieties of felspar and preh- 

 nite. 



EDMO'NDIA. A genus of fossil bivalve 

 shells, established by M. Koninck ; 

 he describes it as convex, equivalve, 

 inequilateral, transverse, sub-oval, 

 or rotund, the lunuli gaping, with 

 no cardinal teeth, with an internal 

 transvere hinge, the ligament in- 

 ternal, and very small. One species, 

 the E. unioniformis, is recorded 

 from the carboniferous limestone of 

 Holland. Lycett. 



EDBYOPHTHA'LMIA. The second order 

 of Crustacea, comprising Laemodi- 

 poda, Amphiboda, and Isopoda. 



EFFLOBE'SCENCE. (effloresce, Lat. efflo- 

 rescence, Fr. efflorescent, It.) 



1 . Production of flowers. 



2. Excrescences in the form of 

 flowers. 



3. The pulverescence of crystals on 

 exposure to the atmosphere. 



It is applied, says Phillips, to 

 such minerals as are found in ex- 

 tremely minute fibres on old walls, 

 &c. 

 EFFLOBE'SCENT. 



1. Shooting out in the form of 

 flowers. 



2. Becoming pulverulent on expo- 

 sure to the atmosphere ; the reverse 

 of deliquescent. 



EFFO'SSION. (from effodio, Lat.) The 

 digging out of the earth, as of 

 fossils, &c. 



EFFU'SE. In conchology, a term 

 applied to shells where the aper- 

 ture is not whole behind, but the 

 lips are separated by a gap. 



E'GEBAN. A variety of idocrase or 

 vesuvian, occuring near Eger, in 

 Bohemia, whence its name. 



EGE'BIA. A genus of fossil bivalves 

 belonging to the tertiary formation. 



EGYPTIAN JASPER. Called also Egypt- 

 ian pebble. The Egyptischer jaspe 

 of Werner. Jaspe Egyptien of 

 Brongniart and Brochant. Quartz 

 agathe onyx of Haiiy. A sub- 

 species of jasper, characterized by 

 its globular or spheroidal form, 



