G48 



INDEX. 



Hippocampus major, development of, 363 



Hirudo, development of blood-vessels of, 

 520 ; exci'etory organs of, 567 



Horse, placenta of, 210 



Hyaloid membrane, 405 



Hylodes, oviposition of, 100 ; metamor- 

 phosis of, 114 



Hyobranchial cleft, 471 



Hyoid arch, of Chick, 149; general account 

 of, 471, 474; modifications of, 472, 475; 

 of Elasmobranchii, 474; of Teleostei, 

 477 ; of Amphibia, 479 ; of Sauropsida, 

 483 ; of Mammalia, 484 



Hyomandibnlar bar of Elasmobranchii, 

 474, 475; of Teleostei, 477; of Am- 

 phibia, 479 



Hyomandibnlar cleft, of Petromyzon, 74 ; 

 Chick, 149 ; general account of, 471 



Hyostylic skulls, 475 



Hypoblast of Elasmobranchii, 42 ; Teleos- 

 tei, 57, 60; Petromyzon, 70; Acipenser, 

 86 ; Lepidosteus, 93 ; Amphibia, 101, 

 107; Chick, 125, 138; Lacerta, 168; 

 Rabbit, 178, 179, 181 ; origin of in Rab- 

 bit, 182 



Hyposkeletal muscles, 557 



Hyrax, placenta of, 207 



Incus, 436, 484 



Infraclavicle, 493 



Infundibulum of Petromyzon, 76; Chick, 

 145 ; general development of, 354 



Insectivora, placenta of, 202 



Insects, nervous system of, 338 ; eye of, 

 396; generative organs of, 613; genera- 

 tive ducts of, 618 



Intercalated pieces of vertebral column, 



■ 454 



Interclavicle, homologies of, 494 



Intermediate cell-mass of Chick, 152 



Intermuscular septa, 554 



Interorbital septum, 469 



Interrenal bodies, 548 



Iris, 402; comparative development of, 

 416 



Iris of Ammocoetes, 81 



Island of Reil, 366 



Jacobson's organ, 442 

 Jugal bone, 488 



Kidney, see ' Metanephros ' 



Labia majora, development of, 599 



Labial cartilages, 490 



Labium tympanicum, 432 ; vestibulare, 



432 

 Lacertilia, general development of, 167 ; 



nares of, 442; pectoral girdle of, 495; 



pelvic girdle of, 499 ; arterial system of, 



533 

 Lacrymal bone, 487 

 Lacrymal duct, 417 

 Lacrymal glands, 417 



Lasmargus, vertebral column of, 452 



Lagena, 432 



Lamina spiralis, 432 



Lamina terminalis, 361 



Larva of Amphioxus, 2; of Ascidia, 12 — 

 18; Teleostei, 65; Petromyzon, 73, 78; 

 Lepidosteus, 96, 263; Amphibia, 111, 

 116; types of, in the Invertebrata, 299 



Larvae, nature, origin, and affinities of, 

 297 — 318 ; secondary variations of less 

 likely to be retained, 299 ; ancestral 

 history more fully recorded in, 299 ; 

 secondary variations in development of, 

 300 ; ontogenetic record of secondary 

 variations in, 298; of freshwater and 

 land animals, 299 ; types of, 299 ; phos- 

 phorescence of, 301 ; of Coelenterata, 

 303 ; table of, 301 ; of Invertebrata, 303 

 et seq. 



Larynx, 630 



Lateral line sense organs, 443; com- 

 parison of, with invertebrate, 443; de- 

 velopment of, in Teleostei, 444; de- 

 velopment of, in Elasmobranchii, 444 



Lateral ventricle, 360; anterior cornu of, 

 362 ; descending cornu of, 362 ; choroid 

 plexus of, 364 



Layers, formation of, in Elasmobranchii, 

 34,46; Teleostei, 57; Petromyzon, 70; 

 Acipenser, 84; Lepidosteus, 92; Am- 

 phibia, 101; Chick, 124, 126; Lacerta, 

 167; Rabbit, 178—183; comparison of 

 Mammalia with lower forms, 187, 240; 

 comparison of formation of in Verte- 

 brata, 229 ; origin and homologies of, in 

 the Metazoa, 274 



Leech, see 'Hirudo' 



Lemuridas, placenta, 213 



Lens, of Ela-smobranchii, 47, 48 ; Petromy- 

 zon, 76, 81 ; Acipenser, 87 ; Lepidos- 

 teus, 95 ; Amphibia, 105 ; Chick, 146 ; 

 of Vertebrate eyes, 399 ; general account 

 of, 406; capsule of, 406; comparative 

 development of, 411 ; of Amphibia, 

 Teleostei, Lepidosteus, 411 



Lepidosteus, development of, 91 ; larva of, 

 96; relations of, 98; spinal nerves of, 

 374 ; ribs of, 463 ; generative ducts of, 

 580, 605 ; swimming-bladder of, 628 



Ligamentum pectinatum, 403 



Ligamentum suspensorium, 459, 460 



Ligamentum vesicae medium, 198 



Limbs, of Elasmobranchii, 48; Teleostei, 

 64; first appearance of in Chick, 152; 

 Rabbit, 192; muscles of, 555 ; of Fishes, 

 500; relation of, to unpaired fins of 

 Fishes, 501, 503 ; of Amphibia, 508 



Liver of Teleostei, 63 ; Petromyzon, 78, 

 79; Acipenser, 90, 91; Amphibia, 107; 

 general account of, 632 



Lizard, development of, 167 ; general 

 growth of embryo of, 172 : MUllerian 

 duct of, 595 



Lizzia, eye of, 388 



