INDEX. 



649 



Lobi inferiores, 355 



Lungs of Amphibia, 113 ; development of, 



628 ; homology of, 630 

 Lymphatic system, 547 



Malleus, 436, 485 ; views on, 486 



Malpighian bodies, development of acces- 

 sory in Elasmobranchs, 573 



Mammalia, development of, 177; com- 

 parison of gastrula of, 242 ; cerebellum 

 of, 350 ; infundibulum of, 355 ; pineal 

 gland of, 357 ; pituitary body of, 359 ; 

 cerebrum of, 361 ; spinal nerves of, 369 ; 

 sympathetic of, 384; vertebral column 

 of, 460 ; branchial arches of, 472, 473 ; 

 mandibular and hyoid arches of, 484; 

 pectoral girdle of, 496 ; pelvic girdle of, 

 499; heart of, 522; arterial system of, 

 532; venous system of, 545; miiscle- 

 plates of, 553 ; mesonephros of, 589 ; 

 testicular network of, 596 ; urinogenital 

 sinus of, 599 ; spermatozoa of, 615 ; 

 lungs of, 629; intestines of, 631; liver 

 of, 632; postanal gut of, 636 ; stomodteum 

 of, 639 



Mammary gland, development of, 329 



Man, placenta of, 202; general account of 

 development of, 221 ; characters of em- 

 bryo of, 225 



Mandibular arch of Elasmobranchii, 51, 

 474 ; Petromyzon, 75 ; Acipenser, 87, 

 {^;6; Chick, 148; general account of, 471, 

 474 ; modification of to form jaws, 472, 

 474; of Teleostei, 477; of Amphibia, 

 479 ; Sauropsida, 483 ; Mammalia, 484 



Mandibular bar, evolution of, 259, 266 



Manis, placenta of, 213 



Marsupial bones, 499 



Marsupialia, foetal membranes of, 198 ; ce- 

 rebellum of, 351 ; corpus callosum of, 

 365 ; iiterus of, 598 



Maxilla, 488 



Meatus auditorius externus, of Chick, 150; 

 development of, 435 



Meckelian cartilage, of Elasmobranchii, 

 474; of Teleostei, 478; of Amphibia, 

 480, 481; of Sauropsida, 484; of Mam- 

 malia, 485 



Mediastinum anterior and posterior, 518 



Medulla oblongata, of Chick, 146 ; general 

 development of, 349 



Medullary plate of Amphioxus, 3, 4; of 

 Ascidia, 9; Elasmobranchii, 36, 39, 45; 

 Teleostei, 58 ; Petromyzon, 72 ; Aci- 

 penser, 85 ; Lepidosteus, 92 ; Amphibia, 

 104, 105, 108; Chick, 131; Lacerta, 168; 

 Eabbit, 185, 188, 190; primitive bilobed 

 character of, 251, 263 



Medusffi, auditory organs of, 423 



Membrana capsulo-pupillaris, 407, 415, 

 418 



Membrana elastica externa, 450 



Membrana limitans of retina, 404 



Membrana tectoria, 430, 432 



Membrane bones, of Amphibia, 479; of 

 Sauropsida, 484; of Mammalia, 485; 

 of mandibular arch, 488; of pectoral 

 girdle, 492, 494 ; origin of, 486 ; homo- 

 logies of, 487 



Membranous labyrinth, development of in 

 Man, 427 



Menobranchus, branchial arches of, 117 



Mesenteron of Elasmobranchii, 35 ; Tele- 

 ostei, 60; Petromyzon, 70; Acipenser, 

 85; Amphibia, 101, 102, 107; Chick, 

 139 ; general account of, 620 



Mesentery, 514, 622 



Mesoblast, of Amphioxus, 5 ; Ascidia, 

 14, 17; Pyrosoma, 20; Salpa, 25; 

 Elasmobranchii, 36, 39; Teleostei, 60; 

 Petromyzon, 71; Acipenser, 86; Lepi- 

 dosteus, 93; Amphibia, 103, 105, 106; 

 of Chick, 127, 138; double origin of in 

 Chick, 128, 130, 131; origin of from 

 lips of blastopore in Chick, 131 ; of area 

 vasculosa of Chick, 133; Lacerta, 168; 

 origin of in Eabbit, 180, 185; of area 

 vasculosa in Rabbit, 188; comparative 

 account of formation of, 243 ; discussion 

 of development of in Vertebrata, 247; 

 meaning of development of in Amniota, 

 247; phylogenetic origin of, 286; sum- 

 mary of ontogeny of, 289 — 292; views 

 on ontogeny of, 292—297 



Mesoblastic somites, of Amphioxus, 5; 

 Elasmobranchii, 40, 45; Petromyzon, 

 72; Acipenser, 87; Lepidosteus, 94; 

 Amphibia, 106, 108; Chick, 134, 151; 

 Rabbit, 189; development of in Chordata, 

 269; meaning of development of, 274; 

 of head, 557 



Mesogastrium, 623 



Mesonephros, of Teleostei, 63, 579; Pe- 

 tromyzon, 78, 81, 577; Acipenser, 91, 581 ; 

 Amphibia, 111, 583; Chick, 152, 588; 

 general account of, 569; development 

 of in Elasmobranchs, 570; of Cyclosto- 

 mata, 577; Ganoidei, 581; sexual and 

 non-sexual part of in Amphibia, 585; 

 of Amniota, 588, 597 ; summary and 

 general conclusions as to, 601 ; relation 

 of to pronephros, 603 



Mesopterygium, 506 



Metagenesis of Ascidians, 23 



Metamorphosis of Amphibia, 113, 116 



Metanephros, 569; development of in 

 Elasmobranchii, 574; of Amphibia, 586; 

 of Amniota, 688; of Chick, 595; of La- 

 certilia, 596 ; phylogeny of, 606 



Metapterygium, 505 



Metapterygoid, of Elasmobranchii, 474, 

 475 ; of Teleostei, 478 



Metazoa, evolution of, 280, 283; ancestral 

 form of, 275, 285 



Mid-brain, of Elasmobranchii, 46, 48, 49; 

 Petromyzon, 76; general account of de- 

 velopment of, 352 



Moina, generative organs of, 613 



