;88 



INDEX. 



Miillerian duct, 690; of Elasmobranchs, 

 693 ; of Ganoids, 704 ; of Amphibia, 

 710; of Aves, 717, 720; opening of in- 

 to cloaca, 727; origin of, 733; sum- 

 mary of development of, 733; relation 

 of to pronephros, 733 



Muscle-plates, of Amphioxus, 6; Elas- 

 mobranchii, 49, 668; Teleostei, 670; 

 Petromyzon, 94; Chick, 183, 670; gene- 

 ral development of, 669 ; of Amphibia, 

 670; Aves, 670; of Mammalia, 671; 

 origin of muscles from, 672 



Muscles, of Ascidia, 11, 17; development 

 of from muscle-plates, 672; of limbs, 

 673; of head, 676; of branchial arches, 

 678; of eye, 678 



Muscular fibres, epithelial origin of, 667 



Muscular system, development of, 667; 

 of Chordata, 668 



Mustelus, placenta of, 66 



Myoepithelial cells, 667 



Mysis, auditory organ of, 5 1 7 



Myxine, ovum of, 100; olfactory organ 

 of, 533 ; portal sinus of, 652 ; excretory 

 system of, 701 



Nails, development of, 397 



Nares, of Acipenser, 108; of Ichthyop- 

 sida, 534; development of in Chick, 

 535 ; development of in Lacertilia, 537 ; 

 development of in Amphibia, 537 



Nasal bones, 592 



Nasal pits, Acipenser, 108; Chick, 176; 

 general development of, 531 



Nematoda, excretory organs of, 689 ; 

 generative organs of, 745 ; generative 

 ducts of, 752 



Nemertines, nervous system of, 311 ; ex- 

 cretory organs of, 68 1 



Nerve cord, origin of ventral, 378 



Nerves, spinal, 449; cranial, 455 466 



Nervous system, central, general account 

 of development of in Vertebrata, 415 ; 

 conclusions as to, 445 ; sympathetic, 

 466 



Nervous system, of Amphioxus, 4; As- 

 cidia, 15, 16; Molgula, 22; Pyrosoma, 

 24, 25; Salpa, 30, 31; Elasmobranchii, 

 44; Teleostei, 77 ; Petromyzon, 89, 93; 

 Acipenser, 105; Amphibia, 126; com- 

 parative account of formation of central, 

 301; of Sagitta, 349; origin of in 

 Ccelenterata, 349; of prajoral lobe, 

 377, 380; evolution of, 400405; de- 

 velopment of in Invertebrates, 406; 

 of Arthropoda, 408; of Gephyrea, 412; 

 Mollusca, 414 



Neural canal, of Ascidia, 10; Teleostei, 

 72; Petromyzon, 88; Acipenser, 105; 

 Lepidosteus, 114; Amphibia, 126, 131 ; 

 Chick, 1 66, 171; Lacerta, 208; closure 

 of in Frog and Amphioxus, 279; closure 

 of in Elasmobranchii, 284; phylogene- 

 tic origin of, 316 



Neural crest, 449, 45^, 4 ; 7 



Neurenteric canal, of Amphioxus, 4, 5 ; 

 Ascidia, 10; Elasmobranchii, 54; Pe- 

 tromyzon, 88; Acipenser, 105; Lepi- 

 dosteus, 113; Aves, 162; Lacerta, 203, 

 206; general account of, 323; meaning 



of, 3 2 3 



Newt, ovum of, 120; development of, 

 125; general growth of, 14! 



Notidanus, vertebral column of, 548; 

 branchial arches of, 572 



Notochord of Amphioxus, 6; Ascidia, 

 II, 17; Elasmobranchii, 51 ; Teleostei, 

 74; Petromyzon, 86, 94; Acipenser, 

 104; Lepidosteus, 113; Amphibia, 128, 

 129; Chick, 157; canal of, in Chick, 

 163; Lacerta, 204, 205; Guinea-pig, 

 226; comparative account of formation 

 of, 292, 325; sheath of, 545; later 

 histological changes in, 546; cartilagin- 

 ous sheath of, 547; in head, 566; 

 absence of in region of trabeculK, 567 



Notodelphys, brood-pouch of, 12 1 ; bran- 

 chue of, 140 



Nototrema, brood-pouch of, 121 



Nucleus pulposus, 559 



Oceania, eye of, 471 



Occipital bone, 595 



CEsophagus, solid, of Elasmobranchii, 

 61, 759; of Teleostei, 78 



Olfactory capsules, 571 



Olfactory lobes, development of, 444 



Olfactory nerves, Ammocoetes, 99; gene- 

 ral development of, 464 



Olfactory organ, of aquatic forms, 531; 

 Insects and Crustacea, 531; of Tuni- 

 cata, 532; of Amphioxus, 532; of 

 Vertebrata, 533; Petromyzon, 533; 

 of Myxine, 533 



Olfactory sacks, of Elasmobranchii, 60; 

 Teleostei, 73; Petromyzon, 92, 97; 

 Acipenser, 106, 108; Lepidosteus, 116; 

 Chick, 176 



Oligochceta, excretory organs of, 683 



Olivary bodies, 426 



Omentum, lesser and greater, 757 



Onchidium, eye of, 473 



Opercular bones, 593 



Operculum, of Teleostei, 77; Acipenser, 

 107; Lepidosteus, 117, 118; Amphibia, 



!35 



Ophidia, development of, 210; arterial 

 system of, 649; venous system of, 656 



Optic chiasma, 430, 493 



Optic cup, retinal part of, 488 ; ciliary 

 portion of, 489 



Optic lobes, 428 



Optic nerve, development of, 492 ; compa- 

 rative development of, 500 



Optic thalami, development of, 431 



Optic vesicle, of Elasmobranchii, 57 59; 

 Teleostei, 74, 499 ; Petromyzon, 89, 92 ; 

 Acipenser, 106; Lepidosteus, 115; 

 Chick, 170; Rabbit, 229; general de- 

 velopment of, 429 ; formation of secon- 



