EPI- 



96 



EQU- 



above the sternum and more an- 

 teriorly placed than the epimeron 

 (zool.). 



epistoma (ep'isto'ma) n. [Gk. epi, 

 upon ; stoma, mouth.] The region 

 between the antenna and the mouth 

 in Crustacea ; a small lobe over- 

 hanging the mouth in the Polyzoa 

 and containing a part of the body 

 cavity ; that portion of the insect's 

 head immediately behind the 

 labrum ; a portion of the rostrum 

 of certain Diptera (zool.). 



epistome, see epistoma. 



epistrophe (epis'trofe) n. [Gk. epis- 

 trophe, turning towards.] The 

 position assumed by the chloro- 

 plasts along the outer and inner 

 walls when exposed to diffuse light 

 (bot.). 



epistropheus (ep'istro'feus, ep'istro'- 

 fyus) n. [Gk. epistropheus, turning.] 

 The axis vertebra (anat}. 



epithalamus (ep'ithal'amus) n. [Gk. 

 epi, upon ; thalamos, chamber.] 

 The trigonum habenulae, the pineal 

 body and the posterior commissure 

 of the brain (anat.). 



epithalline (ep'ithal'ln) a. [Gk. epi, 

 upon ; thalla, stem.] Growing upon 

 the thallus (hot.}. 



epitheca (gp'ithe'ka) n. [Gk. epi, 

 upon ; theke, cup.] An external 

 layer surrounding the lower part 

 of the theca in many Corals (zool}. 



epithecium (e"p'ithe'kium, gp'ithe'- 

 shtum) n. [Gk. epi, upon ; theke, 

 cup.] The surface of the spore- 

 cases in Lichens and Fungi (dot.). 



epithelial (ep'ithe'lial) a. [Gk. epi, 

 upon ; t/tele, nipple.] Pert, epithe- 

 lium. 



epithelium (ep'lthe'lium) n. [Gk. 

 epi, upon ; thele, nipple.] Any 

 cellular tissue covering a free 

 surface or lining a tube or cavity 

 (biol.). 



epithem (ep'Tthgm) n. [Gk. eft, 

 upon ; tithenai, to put.] A group 

 of specialized colourless paren- 

 chyma cells surrounding a space 

 in the tissue of a plant and forming 

 a hydathode (bot.) ; an excrescence 

 on the beak of birds (zool.). 



epithema, see epithem. 



epitheme, see epithem. 



epitokous (epTt'b'kus) a. [Gk. epi, 



upon ; tokos, birth.] Designating 

 the heteronereid stage of certain 

 Polychaetes (zool.). 



epitrichial (ep'itrik'ial) a. [Gk. epi, 

 upon ; thrix, hair.] Pert, or re- 

 sembling the epitrichium (emb.). 



epitrichium (ep'itrlk'ium) n. [Gk. 

 epi, upon ; thrix, hair.] An outer 

 layer of the epidermis in the foetus 

 of many mammals, usually shed 

 before birth (emb.}. 



epitrochlea (gp'itrok'lea) n. [Gk. 

 epi, upon ; trochos, wheel.] The 

 inner condyle at the distal end of 

 the humerus (anat.). 



epitympanic (e'p'itimpan'ik) a. [Gk. 

 epi, upon ; L. tympanum, kettle- 

 drum.] Situated above the tympa- 

 num (zool.). 



epixylous (ep'iksi'lus, epik'siliis) a. 

 [Gk. epi, upon ; xylon, wood.] 

 Growing upon wood (bot.). 



epizoic (ep'izo'ik) a. [Gk. epi, upon ; 

 zoon, animal.] Pert, animals living 

 on or attached to the body of 

 another animal (zool.). 



epizoon (gp'izo'on) ;;. [Gk. epi, upon ; 

 zoon, animal.] An animal living 

 on another ; an external parasite 

 (zool.). 



epizootic (ep'izoot'ik) a. [Gk. epi, 

 upon ; zoon, animal.] Common 

 among animals (zool.). 



epizygal (ep'izl'gal) n. [Gk. epi, 

 upon ; zygon, yoke.] The upper 

 ossicle in a syzygial pair of 

 brachials or columnars in the 

 Crinoids (zool.}. 



eponychium (ep'onik'ium) . [Gk. 

 epi, upon ; onyx, nail.] The thin 

 cuticular fold which overlaps the 

 lunula of the nail (anat.) ; the 

 dorsal portion of a neonychium 

 (emb.). 



epoophoron (gp'ooftiron) n. [Gk. 

 epi, upon ; oon, egg ; p herein, to 

 bear.] A rudimentary organ, the 

 remains of the WolfHan body of 

 the embryo, lying in the meso- 

 salpinx between the ovary and the 

 uterine tube (anat.). 



equal (e'kwal) a. [L. aequalis, equal.] 

 Having the portions of the lamina 

 equally developed on the two sides 

 of the midrib ; appl. leaves (bot.). 



equation division, in mitosis, by 

 the longitudinal splitting of the 



