INDEX. 



Hippocampus major, development of, 363 



Hirudo, development of blood-vessels of, 

 520 ; excretory organs of, 567 



Horse, placenta of, 210 



Hyaloid membrane, 405 



Hylodes, ovipositiou of, 100 ; metamor- 

 phosis of, 114 



Hyobranchial cleft, 471 



Hyoid arch, of Chick, 140; general account 

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

 of Elasmobrauchii, 474; of Teleostei, 

 477 ; of Amphibia, 479 ; of Sauropsida, 

 483 ; of Mammalia, 484 



Hyomandibular bar of Ela<miobranchii, 

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

 phibia, 479 



Hyomandibular 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 



Infuuclibulum 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 



Interrnuscular septa, 554 



Interorbital septum, 469 



Interrenal bodies, 548 



Iris, 402 ; comparative development of, 

 416 



Iris of Ammocretes, 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 ppiralis, 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 Ccelenterata, 

 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 Elasmobranchii, 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 vesicffi 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 fius of 

 Fishes, 501, 503 ; of Amphibia, 508 



Liver of Teleostei, 63 ; Petromyzon, 78, 

 79; Acipeuser, 90, 91; Amphibia, 107; 

 general account of, 632 



Lizard, development of, 167 ; general 

 growth of embryo of, 172 : Miilleriau 

 duct of, 595 



Lizzia, eye of, 388 



