INDEX. 



713 



Morphology, 5 



Morula, 43 



Mosasaurus maximus, 500 



Mosquito, 357 



Moths, 3o8 



Mound bird, 546 



Mouse, 586 



Mucous canal of fishes, 442 



Mud dauber, 383 



Mud fish, 433 



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 



Isevis, 430 



vulgaris, 420 

 Muzir, 604 

 Mya arenaria, 222 

 Mygale avicularia, 863 



Hentzii, 363 

 Myliobatis, 416, 424 



fremenvillii, 422 

 Mylodon, 579 

 Myriopoda, 336, 365 

 Myriotrochus Rinkii, 134 

 Myriozoum subgracile, 180 

 Mysis, 293 

 Mysticete, 593 

 Mytilus edulis, 338 

 Myxine, 409 i 



Naja, 499 



Nanemys guttatus, 510 

 Narwhale, 594 

 Nasua, 615 

 Natatores, 544 



Natica heros, anatomy of, 341 

 Natrix torquata, 495 

 Nauplius, 274 

 Nautilus pompilius, 260 

 Nebalia, 291 



bipes, 293 

 Necturus lateralis, 478 

 Nematelminthes, development of, 

 164 



structure of, 163, 175 

 Nematodes, 167, 175 

 Nematogene, 141 

 Nemertian worms, 196 

 Nemertina, development of, 197 



structure of, 196, 199 

 Neochanna, 452 

 Nephila plumipes,' 348 

 Nereis virens, anatomy of, 211 

 Nervous system, 638 

 Nervous system of ctenophores, 

 93 



insects, 317 



hydrozoa, 62, 65 

 Nests of birds, 536 

 Neuroptera, 349 

 Neurula stage of leeches, 228 



worms, 330 

 Nighthawk, 551 

 Noctiluca mlliaris. 33 ^ 

 Noises produced by fishes, 443, 



443 

 Notacanthus, 446 

 Notochord of ascidians, 396 

 Notommata, 177 

 Nototrema marsupiatum, 485 

 Nudibranch molluscs, 345 

 Numerius longirostris, 545 

 Nummulites, 25 

 Nurse of trematode worms, 149 

 I Nyctea nivea, 549 



OCULINA, 80 



Octacnemus bythius, 393 

 Octopod cephalopoda, 260 



