INDEX AND GLOSSARY 



403 



occurrence and general characters, 158 : 

 mycelium and aerial hyphae, 160-163 : 

 sporangia and spores, 160-162-165 ; transi- 

 tion from uni- to multi-cellular condi- 

 tion, 162: development of spores, 163; 

 conjugation, 165: death, 166 : nutrition, 

 167 ; parasitism, 167 : ferment-cells, 168 

 Mucous membrane, 58 



Multicellular, formed of many cells, 61, 



162 

 Muscle (inusculus, a little mouse,a muscle), 



nature of, 130, 131 

 Muscle-fibres, Bougainvillea, 244 

 Muscle-plate, Polygordius, development 



of, 305 



Muscle-process, Hydra, 227, 232 



Mushroom. See Agaricus. 



MUSSEL (same root as muscle), Fresh- 

 water : Figure, 321 : general characters, 

 320 : mantle, shell, and foot, 320 : food- 

 current, 320 : enteric canal, 322 : gills 

 and blood-system, 323 : nephridia, gon- 

 ads, and nervous system, 323 



Mycelial hyphae, the hyphae interwoven 

 to form a mycelium. 



My eel ium (JU.VKTJS, a fungus), a more or 

 less felt-like mass formed of interwoven 

 hyphae : Mucor, 160 : Penicillium, 185 



MYCET'OZOA (MV'*T?S, a fungus : &ov, 

 an animal) : Figure, 53 : occurrence 

 and general characters, 52 : nutrition, 



54 : reproduction and life-history, 54, 



55 : animals or plants? 181 

 My'ophan (/u.s, mouse, muscle : (au-w, to 



appear), no 



Myxomyce'tes (^v^a, mucus : /UV'KTJS, a 

 fungus). See Mycetozoa. 



N 



Nem'atocyst (crj/aa, a thread : Kuerris, a 



bag), 229 

 Nephrid'iopore (re^pos, a kidney : Ti-opos, 



a passage), the external opening of a 



nephridium, 285 

 Nephrid ium (ve<}>p6<;, a kidney), structure 



of, Polygordius, 285 (Figure) : develop- 



ment of, 304 : Mussel, 323 : Dogfish, 



Neph'rostome (^e</>p6s, a kidney : a"r6ju.<x, 

 a mouth), the internal or ccelomic aper- 

 ture of a nephridium, 285 



Nerve, afferent and efferent, functions of, 

 288 



Nerve-cell, 230, 245 



Nervous system, central and peripheral : 

 Medusa, 245 : Polygordius, 286 : func- 

 tions of, 288 : Starfish, 313 : Crayfish, 

 319 : Mussel, 323 : Dogfish, 330 



Neur'OC03le (vevpor, a nerve : KOI'ATJ, a 

 hollow), the central cavity of the verte- 

 brate nervous system, 330 



NITELL'A (niteo, to shine) '.Figures, 



207, 212, 215, 217, 219: occurrence and 

 general characters, 206 : microscopic 

 structure, 209 : terminal bud, 211 : struc- 

 ture and development of gonads, 209, 

 214 : development, 219 : alternation of 

 generations, 220 



Node (nodus, a knot), the portion of a 

 stem which gives rise to leaves, 208 



Not'OChord (VGOTOS, the back : \opSri, a 

 string), 328 



Nucel lus (diminutive of nucleus, the 

 name formerly applied), 375, 382 



Nuclear division, indirect : 64 (Figure) : 

 65, 67 : direct, 67 



Nuclear membrane, 62, 



Nuclear protoplasm. See Achromatin. 



Nuclear spindle, 65, 66 



Nucle'olus (diminutive of nucleus), 8 



Nu'cleus (nucleus, a kernel), minute struc- 

 ture of, 63 ; Amoeba, 7, 8 : Paramoecium, 

 in, 114 : Opalina, 121 : Vorticella, 

 128: Nitella, 210, 213: fragmentation 

 of, 1 20 



Nucleus, secondary, of megaspore, An- 



giosperms, 382 



Nutrient solution, artificial, principles of 

 construction of, 78, 



Nutrition: Amoeba (holozoic), n: Hx- 

 matococcus (holophytic), 28 : Hetero- 

 mita (saprophytic), 37 : Opalina (type of 

 internal parasite), 123 : Mucor 167 : 

 Penicillium, 190 : Polygordius (type of 

 higher animals), 273, 281 : Moss (type 

 of higher plants), 340 



O 



Ocellus (ocellus, a little eye), structure 

 and functions of, Medusa, 241, 246 



(Esoph'agUS (oi<ro(/>ayo?, the gullet). See 

 Gullet. 



Ontog eny (O^TOS, being : ye^ecrt?, origin), 

 the development of the individual : 

 a recapitulation of phylogeny (q.v.), 

 146 



Oogen'esis (o>dv, an egg : ye^eVis, origin), 

 the development of an ovum from a 

 primitive sex-cell, 255, 258 



Oogon ium (u>6v, egg : yovos, produc- 

 tion), the name usually given to the 

 ovary of many of the lower plants. 



Oosperm (tooV, egg : o-Tre'p/xa, seed), a 

 zygote (q.zi), formed by the ovum and 

 sperm: a unicellular embryo, 173: 

 origin of nucleus of, 263 



Oosphere (toov, an egg : <r</>aipa, a sphere), 

 a name frequently given to the ovum of 

 plants. 



Oospore (d>6t/, an egg : cnropd, a seed), a 

 name frequently applied to the oosperm 

 of plants. 



OPALIN'A (from its opalescent appear- 

 ance) : Figure, 122 : occurrence and 

 general characters, 121-123: structure 



