INDEX AND GLOSSARY 



403 



mycelium and aerial hyphae, 157, 159 '. 

 sporangia and spores, 157-159 : transition 

 from uni- to multi-cellular condition, 

 160 : development of spores, 161 : con- 

 jugation, 163 : death, 165 : nutrition, 

 165 : parasitism, 165 : ferment-cells, 166 



Mucous membrane, 58 



Multicellular, formed of many cells, 61, 

 1 60 



Muscle (miescielns,a. little mouse,a muscle), 

 nature of, 128, 129 



Muscle-fibre, Bougainvillea, 241 



Muscle-plate, Polygordius, development 

 of, 301 



Muscle-process. Hydra, 225, 228 



Mushroom. See Agaricus. 



MUSSEL (same root as muscle), Fresh- 

 water : Figure, 317 : general characters, 

 316 : mantle, shell, and foot, 316 : food- 

 current, 316, 318 : enteric canal, 318 : 

 gills and blood-system, 319 : nephridia, 

 gonads, and nervous system, 319 



Mycelial Iiypha3, the hyphee interwoven 

 to form a mycelium. 



Mycelium (JUVKT/?, a fungus), a more or 

 less felt-like mass formed of interwoven 

 hyphae : Mucor, 157 : Penicillium, 185 



MYCET'OZOA OXV'/CTJ?, a fungus : &ov, 

 an animal) : Figure, 53 : occurrence 

 and general characters, 52 : nutrition, 

 54 : reproduction and life-history, 54, 

 55 : animals or plants? 179 



My'ophan (M^S, mouse, muscle : 4>aii/ci>. to 

 appear), 108 



Myxomyce'tes (MV<X, mucus : 

 fungus). See Mycetozoa. 



NITELL'A (nit io, to shine) : Figures, 

 205, 210, 213, 215, 217 : occurrence and 

 general characters, 204 : microscopic 

 structure, 207 : terminal bud, 208 : struc- 

 ture and development of gonads, 207, 

 212 : development, 214 : alternation of 

 generations, 218 



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

 stem which gives rise to leaves, 206 



Not'ochord (I/WTO?, the back : \opri, a 

 string), 324 _ 



Nucel'lus (diminutive of nucleus, the 

 name formerly applied), 371, 379 



Nuclear division, indirect : in animal 

 cell, 64 (Figure) : in plant cell, 65, 66 

 (Figure) : direct, 65 



Nuclear membrane, 62, 63 



Nuclear protoplasm. See Achromatin. 



Nuclear spindle, 64, 65 



Nucle'olus (diminutive of nucleus), 8 



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

 ture of, 63 : Amoeba, 7, 8 : Paramcecium, 

 109, 113 : Opalina, 121 : Vorticella, 

 126 : Nitella, 208, 214 : fragmentation 

 of, 118 



Nucleus, secondary, of megaspore, An- 

 giosperms, 379 



Nutrient solution, artificial, principles of 

 construction of, 78 



Nutrition : Amoeba (holozoic), IT : Hx- 

 matococcus (holophytic), 28 : Hetero- 

 mita (saprophytic), 37 : Opalina (type of 

 internal parasite), 122 : Mucor 165 : 

 Penicillium, 188 : Polygordius (type of 

 higher animals), 269, 277 ; Moss (type 

 of higher plants), 336 



N 



O 



Nem'atOCyst (fTJ/ua, a thread : KVO-TIS, a 

 bag), 226 



Nephrid'iopore (ve^pos, a kidney : Tropo?, 

 a passage), the external opening of a 

 nephridium, 281 



Nepnrid'ium (ve^po?, a kidney), structure 

 of, Polygordius, 281 (Figure) : develop- 

 ment of, 300 ; Mussel, 319 : Dogfish, 

 326 



Neph'rOStome (ve<}>p6s, a kidney : crroiJ-a, 

 a mouth), the internal or ccelomic aper- 

 ture of a nephridium, 281 



Nerve, afferent and efferent, functions of, 

 284 



Nerve-cell, 227, 242 



Nervous system, central and peripheral : 

 Medusa, 242 : Polygordius, 282 : func- 

 tions of, 285 : Starfish, 309 : Crayfish, 

 315 : Mussel, 319 : Dogfish, 326 



Neur'OCCele (vevpov, a nerve : KOI'ATJ, a 

 hollow), the central cavity of the verte- 

 brate nervous system, 326 



Ocellus (ocellus, a little eye), structure 

 and functions of, Medusa, 239, 243 



CEsoph'agUS (ot<ro(f)dvo?, the gullet). See 

 Gullet. 



OntOg'eny (OVTO?, being : yere'p-is, origin), 

 the development of the individual : 

 a recapitulation of phylogeny (<7.7-.), 



145 



Oogen'esiS (<i>6v, an egg : yefe'cris, origin), 

 the development of an ovum from a 

 primitive sex-cell, 252, 254 



Oogon ium (u>ov, egg : yovo?, produc- 

 tion), the name usually given to the 

 ovary of many of the lower plants. 



Oosperm (tioV, egg : o-n-ep/aa, seed), a 

 zygote (q.v.) formed by the ovum and 

 sperm : a unicellular embryo, 171 : 

 origin of nucleus of, 257 



Oosphere (uov, an egg : o-<oupa, a sphere), 

 a name frequently given to the ovum of 

 plants. 



Oospore (u>6v, an egg : a-rropd, a seed), a 



