;86 



INDEX. 



Hyomandibular cleft, of Petromyzon, 91 ; 

 Chick, 179 ; general account of, 572 



Hyostylic skulls, 582 



Hypoblast of Elasmobranchii, 51 ; Tele- 

 ostei, 71, 75; Petromyzon, 86; Acipen- 

 ser, 104; Lepidosteus, 113; Amphibia, 

 122, 129; Chick, 151, 167; Lacerta, 

 203; Rabbit, 215, 216, 219 ; origin of 

 in Rabbit, 220 



Hyposkeletal muscles, 675 



Hyrax, placenta of, 249 



Incus, 529, 590 



Infraclavicle, 600 



Infundibulum of Petromyzon, 92 ; Chick, 

 175 ; general development of, 430 



Insectivora, placenta of, 243 



Insects, nervous system of, 410; eye of, 

 481; generative organs of, 745; gene- 

 rative ducts of, 751 



Intercalated pieces of vertebral column, 



55 1 



Interclavicle, homologies of, 602 



Intermediate cell-mass of Chick, 183 



Intermuscular septa, 672 



Interorbital septum, 570 



Interrenal bodies, 665 



Iris, 489 ; comparative development of, 



506 



Iris of Ammoccetes, 98 

 Island of Reil, 444 



Jacobson's organ, 537 

 Jugal bone, 594 



Kidney, see ' Metanephros ' 



Labia majora, development of, 727 



Labial cartilages, 597 



Labium tympanicum, 525 ; vestibulare, 



5 2 5 



Lacertilia, general development of, 202 ; 

 nares of, 537 ; pectoral girdle of, 603 ; 

 pelvic girdle of, 607 ; arterial system 

 of, 649 



Lacrymal bone, 593 



Lacrymal duct, 506 



Lacrymal glands, 506 



Lasmargus, vertebral column of, 548 



Lagena, 524 



Lamina spiralis, 524 



Lamina terminalis, 438 



Larva of Amphioxus, 2 ; of Ascidia, 15 

 2r; Teleostei, 81 ; Petromyzon, 89, 95; 

 Lepidosteus, 117, 318; Amphibia, 134, 

 142; types of, in the Invertebrata, 363 



Larvce, nature, origin, and affinities of, 

 360 386 ; secondary variations of less 

 likely to be retained, 362 ; ancestral 

 history more fully recorded in, 362 ; 

 secondary variations in development of, 

 363 ; ontogenetic record of secondary 

 variations in, 361; of freshwater and 

 land animals, 362; types of, 362; phos- 

 phorescence of, 364; of Ceelenterata, 



367 ; table of, 36=; ; of Invertebrata, 

 367 et seq. 



Larynx, 766 



Lateral line sense organs, 538 ; compari- 

 son of, with invertebrate, 538 ; develop- 

 ment of, in Teleostei, 538 ; develop- 

 ment of, in Elasmobranchii, 539 



Lateral ventricle, 438 ; anterior cornu of, 

 440 ; descending cornu of, 440; choroid 

 plexus of, 443 



Layers, formation of, in Elasmobranchii, 

 41, 56 ; Teleostei, 71 ; Petromyzon, 

 85; Acipenser, 103 ; Lepidosteus, in ; 

 Amphibia, 121; Chick, 150, 152; 

 Lacerta, 202; Rabbit, 215 227; com- 

 parison of Mammalia with lower forms, 

 226, 289; comparison of formation of 

 in Vertebrata, 275; origin and homolo- 

 gies of, in the Metazoa, 331 



Leech, see ' Hirudo ' 



Lemuridae, placenta, 256 



Lens, of Elasmobranchii, 57, 58 ; Pe- 

 tromyzon, 94, 99 ; Acipenser, 106 ; 

 Lepidosteus, 115; Amphibia, 127; 

 Chick, 177 ; of Vertebrate eyes, 485 ; 

 general account of, 493 ; capsule of, 493 ; 

 comparative development of, 499 ; of 

 Amphibia, Teleostei, Lepidosteus, 499 



Lepidosteus, development of, in ; larva 

 of, 117; relations of, 119; spinal nerves 

 of, 455; ribs of, 561 ; generative ducts 

 of, 704, 735 ; swimming-bladder of, 

 .763 



Ligamentum pectinatum, 490 



Ligamentum suspensorium, 557, 558 



Ligamentum vesicte medium, 239 



Limbs, of Elasmobranchii, 59 ; Teleostei, 

 80 ; first appearance of in Chick, 

 184 ; Rabbit, 232 ; muscles of, 673 ; of 

 Fishes, 609; relation of, to unpaired fins 

 of Fishes, 6n, 612; of Amphibia, 618 



Liver of Teleostei, 78 ; Petromyzon, 95, 

 96; Acipenser, no; Amphibia 130; 

 general account of, 769 



Lizard, development of, 202; general 

 growth of embryo of, 208; Mullcrian 

 duct of, 721 



Lizzia, eye of, 471 



Lobi inferiores, 431 



Lungs of Amphibia, 137 ; development 

 of, 763 ; homology of, 766 



Lymphatic system, 664 



Malleus, 529, 591 ; views on, 591 

 Malpighian bodies, development of acces- 

 sory in Elasmobranchs, 695 

 Mammalia, development of, 214; com- 

 parison of gastrula of, 291 ; cerebellum 

 of, 427 ; infunclibulum of, 431 ; pineal 

 gland of, 434; pituitary body of, 436; 

 cerebrum of, 439 ; spinal nerves of, 449 ; 

 sympathetic of, 466 ; vertebral column 

 of, 558; branchial arches of, 573, 574; 

 mandibular and hyoid arches of, 589 ; 

 pectoral girdle of, 604 ; pelvic girdle of, 



