INDEX. 



Morphology, 5 



Morula, 43 



Mosasaurus maximus, 500 



Mosquito, 357 



Moths, 358 



Mound bird, 546 



Mouse, 586 



Mucous canal of fishes, 442 



Mud dauber, 383 



Mud fish, 432 



puppy, 478 



sun fish, 443 

 Mullet, 443 

 Mus, 586 



Musca domestica, 355 

 Musical fishes, 443 

 Music of mammals, 569 

 Mussa, 80 

 Mussel, edible, 248 



development of, 254 

 Mustela foina, 617 

 Mustelus canis, 420 



lams, 420 



vulgaris, 420 

 Muzir, 604 

 Mya arenaria, 222 

 My gale avicularia, 363 



Hentzii, 363 

 Myliobatis, 416, 424 



fremenvillii, 422 

 Mylodon, 579 

 Myriopoda, 336, 365 

 Myriotrochus Rinkii, 216 

 Myriozoum subgracile, 138 

 Mysis, 293 

 Mysticete, 592 

 My til us edulis, 228 

 Myxine, 409 



NAJA, 499 



Nanemys guttatus, 510 

 Narwhale, 594 

 Nasua, 615 

 Ntitatores, 544 



Natica heros, anatomy of, 241 

 Natrix torquata, 495 

 Nauplius; 274 

 Nautilus pompilius, 260 

 Nebalia, 291 



bipes, 292 



Necturus lateralis, 478 

 Nematelminthes, development of, 

 122 



structure of, 121, 133 

 Nematodes, 125, 133 

 Nematogene, 99 

 Nemertian worms, 154 

 Nemertina, development of , 155 



structure of, 154, 157 

 Neochanna, 452 

 Nephila plumipes, 343 

 Nereis virens, anatomy of, 169 

 Nervous system, 638 

 Nervous system of ctenophores, 

 92 



insects. 317 



hydrozoa, 62, 65 

 Nests of birds, 536 

 Neuroptera, 349 

 Neurula stage of leeches, 166 



worms, 168 

 Nighthawk, 551 

 Noctiluca miliaris, 33 

 Noises produced by fishes, 442, 



443 



Notacanthus, 446 

 Notochord of ascidiaus, 396 

 Notommata, 135 

 Nototrema marsupiatum, 485 

 Nudibranch molluscs, 245 

 Numerius longirostris, 545 

 Nummulites, 25 

 Nurse of trematode worms, 107 

 Nyctea nivea, 549 



OCTJLINA, 80 

 Octacnemus bythius, 392 

 Octopod cephalopoda, 260 



