GENERAL INDEX 527 
Heterostraci, 29, 275, 326, 343 
Hirudinea, 478 
Histolysis in transformation of the lamprey, 59 
Homology of branchial region of vertebrate and invertebrate, 149 
vi ductless glands and nephridial organs, 418 
external genital ducts of arthropods and nephridia of annelids, 429 
rn germinal layers in all Metozoa, 459 
5 pituitary body of Ammoccetes and coxal glands of Limulus, 319 
tubular muscles of Ammoccetes and veno-pericardial muscles of 
Limulus, 309 
ventral aorta of vertebrate and longitudinal venous sinuses of Limulus, 
178 
Hydra, 441, 465, 472, 476 
Hydrophilus larva, eye, 84 
Hyoid segment in Ammoccetes, 186, 267 
Hypoblast, 484, 488, 444, 445, 459 
Hypoctonus, cartilage cells in entosternite, 133 
ae operculum, 189, 207 
Hypogastric plexus, 3 
Hypogeophis, 393 
Hypophysis, 229, 244, 317, 318, 340 
INFUNDIBULUM, position, 122, 132 
tube, the ancestral cesophagus, 4, 37, 244, 318 
relation to neural canal, 14, 36, 318, 440, 457 
4 es 5j notochord, 318, 435, 440 
oF % 5 olfactory tube, 220, 228, 318, 340 
Insects, chordotonal organs, 364, 370 
Invertebrate, heart, 175, 179 
excretory organs, 418 
nervous system, 18, 54 
segmental nerves, 152: 
”» 
” ” 
” 
” 
oF 
Keraspris, 75, 328, 338 
Kidney, 420, 459, 476 
» nerves, 477 
King-crab, v. Limulus 
LaByRINTHODONT, 21, 28 
Lamina terminalis, 49 
Lamprey, v. Ammoccetes and Petromyzon 
Larva, v. Transformation of the Lamprey 
Lateral line system, 261, 355, 411, 470 
Law of Progress, 19 
»  Recapitulation, 434, 456, 498 
Layer, germinal, 459 
,, laminated, 347, 348 
Leech, 421 
Lens, formation, 83, 115 
Lepidosiren, 148, 461, 466 
Limulus or king-crab, 25, 140, 236, 240 
appendages, branchial, 138, 164, 175 
