INDEX. 



787 



608 ; heart of, 636 ; arterial system of, 

 647; venous system of, 661 ; muscle- 

 plates of, 671 ; mesonephros of, 714; 

 lenticular network of, 724 ; urinogenital 

 sinus of, 727 ; spermatozoa of, 747 ; 

 lungs of, 765; intestines of, 768; liver 

 of, 769; postanal gut of, 774; stomo- 

 dix-um of, 775 



Mammary gland, development of, 398 



Man, placenta of, 244 ; general account of 

 development of, 265 ; characters of em- 

 bryo of, 270 



Mandibular arch of Elasmobranchii, 62, 

 576; Petromyzon, 91 ; Acipenser, 106, 

 116; Chick, 179; general account of, 

 572, 575 ; modification of to form jaws, 

 r7..' 57r'> of Teleostei, 580; of Am- 

 phibia, 582; Sauropsicla, 588; Mam- 

 malia, 589 



Mandibular bar, evolution of, 311, 321 



Mauis, placenta of, 256 



Marsupial bones, 608 



Marsupialia, fetal membranes of, 240; ce- 

 rebellum of, 426 ; corpus callosum of, 

 443 ; uterus of, 726 



Maxilla, 594 



Meatus auditorius externus, of Chick, 181; 

 development of, 527 



Meckelian cartilage, of Elasmobranchii, 

 576; of Teleostei, 581 ; of Amphibia, 

 584, 585 ; of Sauropsicla, 588 ; of Mam- 

 malia, 590 



Mediastinum anterior and posterior, 630 



Medulla oblongata, of Chick, 176 ; gene- 

 ral development of, 425 



Medullary plate of Amphioxus, 4, 5 ; of 

 Ascidia, n; Elasmobranchii, 44, 47. 

 55; Teleostei, 72; Petromyzon, 88; 

 Acipenser, 104; Lepidosteus, in; Am- 

 phibia, 126, 127, 131; Chick, 159; 

 Lacerta, 204; Rabbit, 223, 227, 228; 

 primitive bilobed character of, 303, 3 r 7 



Medusae, auditory organs of, 513 



Membrana capsulo-pupillaris, 494, 504, 



507 



Membrana elastica externa, 546 



Membrana limitans of retina, 491 



Membrana tectoria, 522, 525 



Membrane bones, of Amphibia, 582 ; of 

 Sauropsida, 588; of Mammalia, 590; 

 of mandibular arch, 593 ; of pectoral 

 girdle, 599, 602 ; origin of, 592 ; ho- 

 mologies of, 593 



Membranous labyrinth, development of 

 in Man, 519 



Menobranchus, branchial arches of, 142 



Mesenteron of Elnsmobranchii, 43 ; Tele- 

 ostei, 75 ; Petromyzon, 85 ; Acipenser, 

 104; Amphibia, 123, 124, 129; Chick, 

 167; general account of, 754 



Mesentery, 626, 756 



Mesoblast, of Amphioxus, 6; Ascidia, 

 17, 20; 1'yrosoma, 24; Salpa, 30; 

 Elasmobranchii, 44, 47; Teleostei. 7=: 

 Petromyzon, 86; Acipenser, 105; Lepi- 



dosteus, 113; Amphibia, 125, 128, 129; 

 of Chick, 154, 167 ; double origin ol in 

 Chick, 154, 158, 159; origin of from 

 lips of blastopore in Chick, 158; of 

 area vasculosa of Chick, lOo; Lacerta, 

 203; origin of in Rabbit, 218, 223 ; of 

 area vasculosa in Rabbit, 227; com- 

 parative account of formation of, 292 ; 

 discussion of development of in Verte- 

 brata, 297 ; meaning of development 

 of in Amniota, 298; phylogenetic origin 

 of, 346 ; summary of ontogeny of, 349 

 352 ; views on ontogeny of, 352 360 



Mesobla^tic somites, of Amphioxus, 6 ; 

 Elasmobranchii, 48, 55 ; Petromyzon, 

 88 ; Acipenser, 105 ; Lepidosteus, 

 114; Amphibia, 129, 131; Chick, 

 161, 1 80; Rabbit, 228; development 

 of in Chordata, 325; meaning of de- 

 velopment of, 331; of head, 676 



Mesogastrium, 758 



Mesonephros, of Teleostei, 78, 702; Pe- 

 tromyzon, 95, 98, 700; Acipenser, 1 10, 

 705; Amphibia, 134, 708; Chick, 184, 

 714; general account of, 690 ; develop- 

 ment of in Elasmobranchs, 691 ; of 

 Cyclostomata, 700 ; Ganoidei, 705 ; 

 sexual and non-sexual part of in Am- 

 phibia, 710; of Amniota, 713, 724; 

 summary and general conclusions as 

 to, 729; relation of to pronephros, 731 



Mesopterygium, 616 



Metagenesis of Ascidians, 34 



Metamorphosis of Amphibia, 137, 140 



Metanephros, 690; development of in 

 Elasmobranchii, 697; of Amphibia, 

 712; of Amniota, 713; of Chick, 722; 

 of Lacertilia, 723; phylogeny of, 736 



Metapterygium, 616 



Metapterygoid, of Elasmobranchii, 576; 

 of Teleostei, 581 



Metazoa, evolution of, 339, 342; ancestral 



form of, 333, 345 



, Mid-brain, of Elasmobranchii, 55, 58, 

 59; Petromyzon, 92; general account 

 of development of, 427 



Moina, generative organs of, 745 



Molgula, development of, 22 



Mollusca, nervous system of, 414; eyes of, 

 472; auditory organs of, 515; excre- 

 tory organs of, 68 1 



Monotremata, fetal membranes of, 240 ; 

 cerebellum of, 426; corpus callosum 

 of, 443 ; cerebrum of, 443 ; urinogeni- 

 tal sinus of, 726 



Mormyrus, generative ducts of, 704 



Mouth, of Amphioxus, 7; of Ascidia, 18; 

 Pyrosoma, 27; Salpa, 31; Elasmo- 

 branchii, 57, 60, 61, 62; Petromyzon, 

 92, 94, 95, 99; Acipenser, 107; Lepi- 

 dosteus, 118; Amphibia, 129, 132, 

 134; Rabbit, 231 ; origin of, 317 



M<>uth, suctorial, of Petromyzon, 99; 

 Acipenser, 107; Lepidosteus, 116, 317; 

 Amphibia, 133, 141, 317 



