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IKDEX. 



Molgula, development of, 18 



MoUusca, nervous system of, 341 ; eyes of, 

 388 ; auditory organs of, 424 ; excretory 

 organs of, 562 



Monotremata, foetal membranes of, 198; 

 cerebellum of, 351 ; corpus callosum of, 

 365 ; cerebrum of, 365 ; urinogenital sinus 

 of, 599 



Mormyrus, generative ducts of, 580 



Mouth, of Amphioxus, 6 ; of Ascidia, 15 ; 

 Pyrosoma, 22; Salpa, 26; Elasmo- 

 branchii, 47, 50, 51, 52 ; Petromyzon, 

 74, 77, 78, 81 ; Acipenser, 88; Lepido- 

 steus, 98; Amphibia, 107, 109, 111; 

 Babbit, 191; origin of, 263 



Mouth, suctorial, of Petromyzon, 81 ; Aci- 

 penser, 88; Lepidosteus, 95, 263; Am- 

 phibia, 109, 116, 263 



Miillerian duct, 569; of Elasmobranchs, 

 571; of Ganoids, 580; of Amphibia, 585; 

 of Aves, 591, 593; opening of into 

 cloaca, 598 ; origin of, 604 ; summary 

 of development of, 604; relation of to 

 pronephros, 604 



Muscle-plates, of Amphioxus, 5; Elasmo- 

 brancli.i, 40, 551 ; Teleostei, 552 ; Pe- 

 tromyzon, 77; Chick, 151, 552; general 

 development of, 551 ; of Amphibia, 552 ; 

 Aves, 552 ; of Mammalia, 553 ; origin of 

 muscles from, 554 



Muscles, of Ascidia, 10, 14; development 

 of from muscle-plates, 554; of limbs, 

 555 ; of head, 557 ; of branchial arches, 

 559 ; of eye, 559 



Muscular fibres, epithelial origin of, 550 



Muscular system, development of, 550; 

 of Chordata, 551 ' 



Mustelus, placenta of, 54 



Myoepithelial cells, 550 



Mysis, auditory organ of, 425 



Myxine, ovum of, 82 ; olfactory organ of, 

 439; portal sinus of, 535; excretory 

 system of, 578 



Nails, development of, 323 



Nares, of Acipenser, 89 ; of Ichthyopsida, 

 440 ; development of in Chick, 441 ; de- 

 velopment of in Lacertilia, 442 ; develop- 

 ment of in Amphibia, 443 



Nasal bones, 487 



Nasal pits, Acipenser, 89; Chick, 146; 

 general development of, 438 



Nematoda, excretory organs of, 5C8 ; gene- 

 rative organs of, 613 ; generative ducts 

 of, 618 



Nemertiues, nervous system of, 258; ex- 

 cretory organs of, 561 



Nerve cord, origin of ventral, 312 



Nerves, spinal, 369; cranial, 374 — 383 



Nervous system, central, general account 

 of development of in Vertebrata, 342 ; 

 conclusions as to, 366; sympathetic, 

 384 



Nervous system, of Amphioxus, 3 ; Ascidia, 

 13, 14; Molgula, 18; Pyrosoma, 20, 21; 

 Salpa, 25, 26 ; Elasmobranchii, 36 ; 

 Teleostei, 62 ; Petromyzon, 73, 76 ; Aci- 

 penser, 87 ; Amphibia, 104 ; comparative 

 account of formation of central, 250; 

 of Sagitta, 289 ; origin of in Ccelenterata, 

 289; of prasoral lobe, 311, 313; evo- 

 lution of, 330 — 335 ; development of in 

 Invertebrates, 335 ; of Arthropoda, 337 ; 

 of Gephyrea, 340 ; Mollusca, 341 



Neural canal, of Ascidia, 9 ; Teleostei, 58 ; 

 Petromyzon, 72 ; Acipenser, 86 ; Lepi- 

 dosteus, 94; Amphibia, 104, 108; Chick, 

 138, 141 ; Lacerta, 172 ; closure of in 

 Frog and Amphioxus, 233; closure of in 

 Elasmobranchii, 236; phylogenetic ori- 

 gin of, 262 



Neural crest, 369, 374, 375 



Neurenteric canal, of Amphioxus, 8, 4; 

 Ascidia, 9 ; Elasmobranchii, 44 ; Petro- 

 myzon, 72; Acipenser, 86; Lepidosteus, 

 93 ; Aves, 135; Lacerta, 168, 170; gene- 

 ral account of, 267 ; meaning of, 268 



Newt, ovum of, 99 ; development of, 103 ; 

 general gi-owth of, 116 



Notidanus, vertebral column of, 452 ; bran- 

 chial arches of, 472 



Notochord of Amphioxus, 5 ; Ascidia, 

 10, 14; Elasmobranchii, 42; Teleostei, 

 60; Petromyzon, 71, 77; Acipenser, 86; 

 Lepidosteus, 93; Amphibia, 105, 106; 

 Chick, 130 ; canal of, in Chick, 135 ; La- 

 certa, 168, 169 ; Guinea-pig, 187 ; com- 

 parative account of formation of, 243, 

 269 ; sheath of, 449 ; later histological 

 changes in, 449 ; cartilaginous sheath 

 of, 451 ; in head, 467 ; absence of in 

 region of trabeculaB, 468 



Notodelphys, brood-pouch of, 100; branchiae 

 of, 116 



Nototrema, brood-pouch of, 100 



Nucleus pulposus, 460 



Oceania, eye of, 388 



Occipital bone, 489 



Oesophagus, solid, of Elasmobranchii, 50, 

 624 ; of Teleostei, 63 



Olfactory capsules, 470 



Olfactory lobes, development of, 366 



Olfactory nerves, Ammoccetes, 81; gene- 

 ral development of, 382 



Olfactory organ, of aquatic forms, 438; 

 Insects and Crustacea, 438; of Tunicata, 

 438; of Amphioxus, 438; of Vertebrata, 

 438; Petromyzon, 439; of Myxine, 439 



Olfactory sacks, of Elasmobranchii, 49,50; 

 Teleostei, 59 ; Petromyzon, 76, 79 ; Aci- 

 penser, 87, 89; Lepidosteus, 95; Chick, 

 146 



Oligochffita, excretory organs of, 564 



Olivary bodies, 350 



Omentum, lesser and greater, 623 



