INDEX 



60 1 



Microzooid, 251, 279 



Mid-biain, 202 



Mid-gut, 357 



Milk-glands, see Glands 



Milk-teeth, 493 



Milt, see Spermatic fluid 



Mitosis, 545, sSs 



Molars, 492, 494 



MoUusca, 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, 



, ^^9 ' 



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



■■ 307>,3i9, 356, 386, 408, 415. 

 "428 



Mouth-cavity, see Buccal cavity 



Movement, spontaneous, volun- 

 tary, and involuntary, 7, 11, 112, 

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



''■and see under various types 



Mucous membrane, 17 



Mule, see Hybrid 



MuUerian duct, 450, 574 



Multinucleate, 269, 369 



Muscle-fibres: striped, 112, 355; 

 unstriped, III, 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 on shell, 384 

 , Muscular layers of enteric canal, 



' 70, 75 



Muscular system, see under various 



. types ; development of, in Verte- 

 brates, 203, 565, 576 



Muscularis mucosas, 133 



Mussel: general characters, 381, 

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

 JP7, J9<?; food-current, 382, J97 ; 

 gills, 382, 386, sgS, S99' 40o ; 

 muscles, 385, jc>S ; enteric canal, 

 386, jgg, 401 ; nephridia, 390, 

 400 ; tilood-system, 392, ^gg ; 

 nervous system, 392, 400 ; sense- 

 organs, 394, 401 ; gonads, 394, 

 402 ; development and 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, 5'5 ! 

 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 



