Transformation of the Lamprey,18,35,59,61,125,168,193,199,200,220,227,228,287,291,304,307,309,331,336,347,349,389,445Tremataspis,32,75,275,326,351,352Trilobites,24,25,26,437Trilo"ites,appendages,351,437Trilo"ites,diagram of section through a trilobite-like animal,413Trilo"ites,dominance of,26Trilo"ites,excretory organs,396Trilo"ites,eyes,74,88Trilo"ites,glabellum,339Trilo"ites,relations of,249,283Trilo"ites,respiratory apparatus,170Trilo"ites,ventral surface,437Tube of central nervous system,37,38,42,102,211,433,455,457Tu"efrom IVth ventricle to surface of brain in Ammocœtes,209Tu"eFallopian,431Tu"ehypophysial,229,244,317,440Tu"emeeting of four tubes in vertebrate,318,440Tu"enotochord originally a,436,440Tu"eolfactory, of Ammocœtes,219,225,317,440Tu"eunsegmented, in segmented animal,439Tunicata,16Tuni"ata,budding of,441Tuni"ata,degeneration,12,17,19,60Tuni"ata,endostyle,198,212Tuni"ata,hypophysis,425Tuni"ata,notochord,438Tuni"ata,position of,494Unit, appendage, in non-branchial segments,185Ui"t,branchial,161,165,168,185Ureters, nerves of,448Uterus of Scorpion group,189,202,203,204,205,214Utr"usvertebrate, nerves of,448Valve, ileo-colic,449Val"e,of Vieussens,48Variation in dominant races,21,88Vari"tionmeristic, in spinal nerves,154,387Veins, forming vertebrate heart,180Velum,228,289,298,302Vertebrates, alimentary canal, innervation of,446Verte"rates,atrial cavity,410Verte"rates,auditory apparatus and lateral-line system,356Verte"rates,body-cavity,401,430Verte"rates,brains,40Verte"rates,branchial organs,151Verte"rates,cœlomic cavities in head region,251,266Verte"rates,cranium, evolution of,342Verte"rates,egg of,483Verte"rates,evolution of,11Verte"rates,excretory organs,389,391,408Verte"rates,glands, ductless,418Verte"rates, gla"ds,internal secretion of,215Verte"rates,heart,175,179,180Verte"rates,muscles, evidence of segmentation of eye,248Verte"rates, mus"les,oblique,278Verte"rates, mus"les,origin of somatic trunk,406Verte"rates,nervous system, central,13Verte"rates,nerves, segmental,152Verte"rates,notochord and gut,434Verte"rates,organs of,10Verte"rates,origin of,9,411,433,457Verte"rates,segments, prosomatic,257Verte"rates,skeleton, commencement of bony,120,458Verte"rates,spinal cord and medulla oblongata,44Verte"rates,spinal region,385Verte"rates,thyroid, connection between generative organs and,215Verte"rates,tubes, meeting of four,318,440Vesicles, cerebral, formation of,48,458Vitellophags,471,483Volvox,479Wolffian body,390Xiphosura,24,26,249Yolk,482
Transformation of the Lamprey,18,35,59,61,125,168,193,199,200,220,227,228,287,291,304,307,309,331,336,347,349,389,445
Tremataspis,32,75,275,326,351,352
Trilobites,24,25,26,437
Trilo"ites,appendages,351,437
Trilo"ites,diagram of section through a trilobite-like animal,413
Trilo"ites,dominance of,26
Trilo"ites,excretory organs,396
Trilo"ites,eyes,74,88
Trilo"ites,glabellum,339
Trilo"ites,relations of,249,283
Trilo"ites,respiratory apparatus,170
Trilo"ites,ventral surface,437
Tube of central nervous system,37,38,42,102,211,433,455,457
Tu"efrom IVth ventricle to surface of brain in Ammocœtes,209
Tu"eFallopian,431
Tu"ehypophysial,229,244,317,440
Tu"emeeting of four tubes in vertebrate,318,440
Tu"enotochord originally a,436,440
Tu"eolfactory, of Ammocœtes,219,225,317,440
Tu"eunsegmented, in segmented animal,439
Tunicata,16
Tuni"ata,budding of,441
Tuni"ata,degeneration,12,17,19,60
Tuni"ata,endostyle,198,212
Tuni"ata,hypophysis,425
Tuni"ata,notochord,438
Tuni"ata,position of,494
Unit, appendage, in non-branchial segments,185
Ui"t,branchial,161,165,168,185
Ureters, nerves of,448
Uterus of Scorpion group,189,202,203,204,205,214
Utr"usvertebrate, nerves of,448
Valve, ileo-colic,449
Val"e,of Vieussens,48
Variation in dominant races,21,88
Vari"tionmeristic, in spinal nerves,154,387
Veins, forming vertebrate heart,180
Velum,228,289,298,302
Vertebrates, alimentary canal, innervation of,446
Verte"rates,atrial cavity,410
Verte"rates,auditory apparatus and lateral-line system,356
Verte"rates,body-cavity,401,430
Verte"rates,brains,40
Verte"rates,branchial organs,151
Verte"rates,cœlomic cavities in head region,251,266
Verte"rates,cranium, evolution of,342
Verte"rates,egg of,483
Verte"rates,evolution of,11
Verte"rates,excretory organs,389,391,408
Verte"rates,glands, ductless,418
Verte"rates, gla"ds,internal secretion of,215
Verte"rates,heart,175,179,180
Verte"rates,muscles, evidence of segmentation of eye,248
Verte"rates, mus"les,oblique,278
Verte"rates, mus"les,origin of somatic trunk,406
Verte"rates,nervous system, central,13
Verte"rates,nerves, segmental,152
Verte"rates,notochord and gut,434
Verte"rates,organs of,10
Verte"rates,origin of,9,411,433,457
Verte"rates,segments, prosomatic,257
Verte"rates,skeleton, commencement of bony,120,458
Verte"rates,spinal cord and medulla oblongata,44
Verte"rates,spinal region,385
Verte"rates,thyroid, connection between generative organs and,215
Verte"rates,tubes, meeting of four,318,440
Vesicles, cerebral, formation of,48,458
Vitellophags,471,483
Volvox,479
Wolffian body,390
Xiphosura,24,26,249
Yolk,482