492 



INDEX AND GLOSSARY 



OrySt'allOidt (Kpv<rraAAof , crystal : elSot 



form), properties of, 6 

 Out'lole (cuticii/a, the outer skin), nature 



of in unicellular animals, 45, log: in 



multicellular animals, 238 

 Oytt (kuoth, a bag), used for cell-wall in 



many cases, 10, ji 



D 



Dalllnger, Pr. W. H , observations on an 

 apparent case of heterogenesLs, 103 



Daughter-oellS, cells formed by the fission 

 or ccmination of a molbcr-cell, 35, 67 



Death, pbenoiiicna attending, 30, ai, t66 



Deoomposltlon, nature of, 6, 91 



Dermal gills. See Respiratory Coeca. 



Dermis {iipfia. skin), the deep or connec- 

 tive tis<iue layer of the skin, 326 



Descent, doctrine of. See Evolution. 



Development, meaning of the term, 43. 

 For development of the various types 

 see under their names 



Dextrin, 113 



Diastase, 8t 



Diast Die (Jtao-TcAAw, to separate), the 

 phase of dilatation of a heart, contractile 

 vacuole, 8ic., 11 1 



DIATOlCA'OEiE (Siariiivu, to cut across, 

 because of the division of the shell into 

 two valves), 155 : Figure, 156 



Dlat'omln, the characteristic yellow colour- 

 ing matter of diatoms, 154, 155 



Dlohot'omous (Si\oToiitio, to cut in two), 

 applied to branching m which the stem 

 divides into two axes of equal value, 318 



DifTerentiatlOn (difffro, to carry different 

 ways), explained and illustrated, 34, no 



Dlges tion Xdigero, to arrange or digest), 

 the process by which food is rendered fit 

 for absorption, 12, : intra- and extra- 

 cellular, 279: contrasted with assimila- 

 tion, 230 



Digestive gland, 335, 35?. 382 



Dimorph'lsm, dimorph'ic ( jtf, twice : 

 /iop</>i), form), existing under two forms, 



35. '3^ 242. 438, 442 , 



Dioe'ciOUS (fit, twice : otxot, a dwelling), 

 applied to organisms in which the male 

 and female organs occur in different in- 

 dividuals, 199 



DEPHYES («t<J.i;r(?, double) : Figure, 250 : 

 occurrence and general characters, 248 : 

 polymorphism, 249 



DiplobliUt'iC (£t7rA6ot, double : /SAaardf, a 

 bud), two-layered : applied to animals in 

 which the body consists of ectoderm and 

 endoderm, 236 : derivation of diploblas- 

 tic from unicellular animals, 261 



Directive sphere, see also Astrosphere 



Disc, Vorticella, 128 



Dispersal, means of : in internal parasite, 

 124 : in fixed organisms, 132, 134 



Distal, the end furthest from the point of 



attachment or organic base, 126 

 Distribution of food-materials :— in a 

 complex animal, 278 : in a complex 

 plant, 409 

 Divergence of character, 145 

 Division of physiological labour, 34 

 DOGFISH : — Figure, 367 : general charac- 

 ters, 368 : exoskeleton, 369 : endo- 

 skeleton (P'igures), 372 : enteric canal 

 (Figures), 381 : gills, 383 : blood-system 

 (Figures), 384 : kidney, 396 : gonads, 

 396 : nervous system and sense organs 

 (Figure), 391 : development (Figure), 



397 

 Dry-rigorj stiffening of protoplasm due to 

 abstraction of water, 31 



Ecdysis (e(cJu<rts, a slipping out), 325 



Echinodermata, the, 305 



Ectoderm {iKTot, outside : £(pM<>, skin), 



the outer cell-layer of diploblastic and 



triplobl.istic animals, 222, 275 

 Eot'OSaro (ckto^, outside : <rdpi, flesh), the 



outer layer of protoplasm in the lower 



unicellular organisms, distinguished by 



freedom from granules, 4 

 Egest'ion (egero, to expel), the expulsion 



of waste matters, la 

 Egg-cell. See Ovum. 

 Elater, 436 

 Em'hryo (iuPpvov, an embryo or foetus), 



the young of an organism before the 



conimeiicement of free existence. 

 Em'hryo-sac. See Megaspore. 

 Encysta'tion, being enclosed in a cyst 



(</■■'■) 



End'oderm (ivSov, within : Septia, skin), 

 the inner cell-layer of diploblastic and 

 triploblastic animals, 222, 228, 275 



Endodermis, 418 



End'oderm-lamella, Medusa, 240 



Endog'enous (ivSov, within : yCyvofiai, to 

 come into being), arising from within, 

 e.^. the roots of vascular plants, 422 



Endophragmal System (evSov, within : 



<l>payixa, protection), 321 



Endopodite (ei/Soc, within , irovs, foot), 323 



End'OSarc (evSov, within : (rapf, flesh), 

 the inner, granular protoplasm of the 

 lower unicellular organisms, 4 



EndOSkel'eton (fcJoc, within, and skeleton, 

 from (7<ce'AA<o, to dry), the internal skele- 

 ton of animals, 372 



End'OSperm {evBov, within : anepiJia, seed), 

 nutrient tissue formed in the megaspore 

 of Phanerogams, 459, 476 



Energy, conversion of potential into 

 kinetic, 15 : source of, m chlorophyll- 

 containing organisms, 31 



