IXDKX AXD GLOSSARY 



497 



a millimetre, or i-25,oooth of an inch, 

 S 4 



Micro-Orfijanism. See Hacteria. 



Micronvu.ieus ( /x'*po, sn-all : nucleus, a 

 kernel), in, 128 



Micropyle (/xiKpos, small : TruArj, an en- 

 trance), 457, 466 



Micro-sporan'gium (jut/epos, small : o-n-opa, 



a seed : ayyeiov, a vessel), the male 

 sporangium in plants with sexually di- 

 morphic sporangia, usually distinguished 

 by its smaller size from the female or 

 mega-sporangium : Salvinia, 440 : Se- 

 laginella, 441 : Gymnosperms, 455 : An 

 giosperms, 466 



Mic'rospore (^i/cpos, small : vnopd, a 

 seed), the male spore in plants with 

 sexually dimorphic spores, always dis- 

 tinguished by its small size from the 

 female or mega-spore : Salvinia, 440 : 

 Selaginella, 441 : Gymnosperms, 455 : 

 Angiosperms, 466 



Microzo Old (/ai/cpos. small : ^wor, an ani- 

 mal : etfios, form), the smaller zooid in 

 unicellular organisms with dimorphic 

 zooids, 35, 132 

 Midrib of leaf, Moss, 403 

 Minimum temperature for amoeboid mov-e- 



ments, 21 



Mollusca, the, 306 



MonOBC'lOUS (/aofos, single : OIKO;, a 

 house), applied to organisms in which 

 the male and female organs occur in the 

 same individual, 199 



Monopod ial (^wos, single : wovs a foot), 

 applied to branching in which the main 

 axis continues to grow in a straight line 

 and sends off secondary axe.-: to the 

 sides, 138 

 MONOSTROMA (/aocos, single : 0-rpw/ixa, 



anything spread out), 202 (Figure) 

 Morphol'Ogy OAop<J>r/, form : Aovos a dis- 

 cussion), the department of biology 

 which treats of form and structure, 9 

 Mor'ula (diminutive of ittdrntii, a mul- 

 berry) See Polyplast. 

 MOSSES : Figures. 401, 406 : general 

 characters, 402 : structure of stem, 402 : 

 leaf, 403 .' rhizoids, 403 : terminal bud, 

 403 : reproduction, 404 : development 

 of sporogonium, 405 : of leafy plant, 

 408 : alternation of generations, 340 : 

 nutrition, 408 



Mouth : Euglena, 47 : Paramcecium, 109 : 

 Hydra, 220 : Medusa, 239 : Polygordius, 

 968 



MUCOR (mncor, mould) : Figure, 159 : 

 occurrence and general characters, 158 : 

 mycelium and aerial hyphae, 160 : 

 sporangia and spores, 160 ; transition 

 from uni- to multi-cellular condition. 

 162 : development of spores, 16^ ; con- 

 jugation, 165 : death, 166 : nutrition. 167 : 

 parasitism. 167 : ferment-cells, 168 



Mucous membrane, 58 



Multicellular, formed of many cells, 61, 



162 

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



nature of. 130 



Muscle-fibres, Bougainvillea, 236 

 Muscle-plate, Polygordius, 273 : develop- 

 ment of, 301 



Muscle-process, Hydra, 224, 232 

 Muscular System, Crayfish, 32*7: Mussel, 



Mushroom. See Agaricus. 



MUSSEL (same root as muscle), Fresh- 

 water -. Figures, 351, 353, 356, 358, 

 361, 364 : general characters, 348 : 

 mantle, shell, and foot, 348 : food- 

 current, 359 : enteric canal, 355 : gills, 

 357 : blood-system, 360 : muscles, 354 : 

 nephridia, 359 : gonads, 363 : nervous 

 system, 362 



Mycelial hyphae, the hyphae interwoven 

 to form a mycelium. 



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

 less felt-like mass formed of interwoven 

 hyphae : Mucor, 160 : Penicillium, 185 



MYCET'OZOA (MU/CTJS, a fungus : &ov, 

 an animal) : Figure, 53 : occurrence 

 and general characters. 52 : nutrition, 

 54 : reproduction and life-history, 54 : 

 animals or plants ''. 181 



Myomere OAVS, mouse, muscle : /oiepos, a 

 part), a muscle-segment, 327 



My'ophan (MUS, mouse, muscle : <}>a.ii>ia. to 

 appear), 1 10 



Myxomyce tes (>tua, slime : /UVKTJS, a 

 fungus). See Myceto/oa. 



X 



NaUpliUS, embryo of Crayfish, 346 



Nem atOCyst (i>rftJ.a, a thread :" (cuoTis, a 

 bag), Figure, 226 



Nephrid'iopore (re</>po?, a kidney : Tropo?, 

 a passage), the external opening of a 

 nephridium, 282 



Nephrid ium (ce</>p6s, a kidney), structure 

 of, Polygordius, 281 (Figure) : develop- 

 ment of, 301 : Mussel, 359: Dogfish, 

 396 



NephTOStome (i>e<j>p6s, a kidney : o-rofxa, 

 a mouth), the internal or ccelomic aper- 

 ture of a nephridium, 282 



Nerve, afferent and efferent, functions of, 

 286 



Nerve-cell, 227, 242 



Nervous system, central and peripheral : 

 Medusa, 243 : Polygordius, 283 : func- 

 tions of, 287: Starfish, 315: Crayfish, 

 241 : Mussel. 362 : Dogfish,. 391 



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

 hollow), the central cavity of the verte- 

 brate nervous system. 391 



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



