INDEX 



6oi 



Microzooid, 251, 279 



Mid-brain, 2O2 



Mid-gut, 357 



Milk^glands, see Glands 



Milk-teeth, 493 



Milt, see Spermatic' fluid 



Mitosis; 545, jSj 



Molars, 492, 494 ' 



Mollusca, 220, 396 



Monads : occurrence and general 



characters, 256 ; movements, 256 ; 



nutrition, 256 ; animals or plants ? 



257 ; rapid multiplication, 282 ; 



practical directions, 260 ■ 

 Monoecious, 302 

 "Morphology, 217 

 Morula, see Polyplast 

 Mother of pearl, see Nacre 

 Mounting sections, directions for, 



m ^ ■ 



Mouth, 4, 16, 253, 265, 275, 290, 



307, 319. 356, 386, 408, 415. 

 • 428 



Mouth-cavity, see Buccal cavity 

 Movement, spontaneous, volun- 

 tary, and involuntary, 7, II, 112, 

 172, 232, 312, 335, 346, 417; 

 ^ and see under various types 

 MucGus membrane, 17 

 Mule, see Hybrid 

 MUllerian duct, 450, 574 

 Multinucleate, 269, 369 

 Muscle-fibres: striped, 112, 355; 

 unstriped. Ill, 131, 133; and 

 see under various types 

 Muscle-processes, 293, 299, 304 

 Muscles : Frog, 18, 57, 59, 63, 205 ; 

 Crayfish, 321, 355 ; Mussel, 385 ; 

 Rabbit, 489 ; and see Myo- 

 mere 

 •Muscles: of eye, 186, 449, 517; 



of middle ear, 519 ' 

 Muscles, papillary, 504 

 ■ Muscular contraction, 160, 276 

 Muscular impressions o'nshell, 384 

 Muscular layers of enteric canal, 

 -; 70,75 ■ 



Muscular system, see under various 

 types ; development of, in Verte- 

 brates, 203, 565, 576 h 



Musgularis mucosae, 133 



MiJssEi. : general characters, 381, 

 ^97 ; mantle, shell, and foot 381,. 

 j'5>7.j9<?; food-current, 382, J97 ; 

 gills, 382^ 386, jp<f, S99' 4°° ; 

 muscles, 385, ^gS ; enteric canal, 

 386, 3gg, 401 ; nephridia, 390, 

 400 ; blood-system, 392, jpp ; 

 nervous system, 392, 400 ; sense- 

 organs, 394, 401 ; gonads,. 394, 

 402 ; development arid meta- 

 morphosis, 395, 400, 562 



Mustelus, 415, 454 



Myocomma, 418 



Myomere, 203, 355, 404, 418, 565 



Myophan layer, 264 



,N. 



N 



acre : nacreous layer, 384 



Nasal organ, see Olfactory organ 



Naso-lachrymal duct, 186, 477, 518 



Naso-palatine canals, see Canals 



Naso-pharynx, 495 



Natural History, 2 



Natural selection,- 226 



Nauplius, 370 



Neck, 468 



Nemathelminthes, 397, 457 



Nematocyst, 295 

 .Nephridiopore, 332 



Nephridium, 146, 331, 361, 368, 

 390, 404, 406, 408, 450, 574 



Nephrostome, 145, 146, 331, 574 



Nerve-cells, 167, 298 



Nerve-collar, 333 



Nerve-cord : ventral, 333, 365 

 .Nerve-fibre, 167 ^ 



Nerve-foramina, 478 ; and see Skull 



and Vertebral column 

 , Nerve-ganglia, 162, 163, 164, 167, 



333, 365. 366, 392 . 



Nerve-plexus : brachial, 161, 515; 

 coeliac, 516; sciatic or lumbo- 

 sacral, 162, 515 



Nerve-roots, 163, 409 



Nerves : afferent and efferent, 166, 

 175 ; cerebral, 163, 445, 515,, 

 568 ; of lateral line, 447 ; motor - 



