6U 



INDEX. 



Thecidium — 'Metameres, 307 ; Generative 

 organs, 313. 



Thecomedasse — Organisation, 98 ; Scy- 

 phostoma form, 98 ; Strobila, 99 ; 

 Ephyra form, 99; Discophora of, 99. 



Thecosomata — Velum, 318, 321 ; Head, 

 324. 



Thelyphonus — Nervous system, 256. 



Thomisus — Trachea, 291. 



Thoracostraca — Optic nerves, 253 ; Ven- 

 tral chord, 251.; Heart, 281 ; Female 

 organs, 294. 



Thylacinus — Marsupial bones, 407. 



Thysanopoda — Branchite, 242. 



Thysanozoon — ^Tentacles, 133; Alimentary 

 canal, 158. 



Thysanura — Gnathites, 245; Feet, 246; 

 Ventral chord, 258 ; Eye, 265; Enteric 

 canal, 272 ; Tracheee, 288. 



Tinea — Goblet-shaped organs, 523. 



Tintinnua— Shells, 83. 



Tipulidfe— Eye, 267. 



Toads — Sperm, 669. 



Tomopteris — Generative organs, 189. 



Torpedo — Electric organs, 500, 505. 



Tortrix— Hyoid, 472. 



Toucan — Tongue, 552. 



Tracheata — Development, 234 ; Appen- 

 dages, 238, 243 ; Antennas, 244; Ner. 

 vous system, 255 ; Salivary glands, 

 273 ; Liver, 275 ; Malpighian vessels, 

 276, 286 ; Fat body, 278 ; Eenal con- 

 cretions, 278 ; Circulatory system, 

 282 ; Tracheae, 286. 



Trachelius — Contractile vesicles, 86. 



Trachyuema — Tentacles, 102, 107 ; Mar. 

 ginal vesicles, 110. 



Tragulida — Stomach, 559. 



Trematoda — Sporocvst, 131 ; Cercarijr, 

 131; Cilia, 137; Aciculi, 139; Stylets, 

 141 ; Dermal glands, 141 ; Suckers, 

 143 ; Nervous system, 146 ; Visceral 

 nerves, 151 ; Visual organs, 153 ; 

 Alimentary canal, 157 ; Glandular 

 organ of enteron, 164 ; Liver, 165 ; 

 Excretory organs, 173 ; Generative 

 organs, 179 ; Pore, 183. 



Tremoctopus — Hectocotylised arms, 327. 



Tricocephalus — Muscular system, 143. 



Trionyx — Plastron, 426. 



Tristoma — Excretory organs, 173. 



Triton — Lungs, 573 ; Heart, 581. 



Tiibicolee— Tube, 134 ; Setje, 140 ; Visual 

 organs, 155 ; Hind-gut, 163 ; Vascular 

 system, 169. 



Tubifex — Generative organs, 189 ; Sper- 

 matophores, 191. 



Tubipora — Skeleton, 106. 



Tubularia — Buds, 95 ; Tentacles, 101 ; 

 Tests, 104; Supporting lamella, 107; 

 Pigmented investment of stomach, 

 108. 



Tunicata — General review, 388 ; Biblio- 

 graphy, 389 ; ClassificatioD, 389 ; 



Form of body, 390 ; Integument, 

 393; Mantle, 393; Skeleton, 391; 

 Muscular system, 391 ; Nervous sys- 

 tem, 395; Sensory ort^ans, 397; Ali- 

 mentary canal, 393 ; Ventral groovo, 

 402 ; Sexual organs, 406. 



Turbellaria— Mouth, 129 ; Tentacles, 132 ; 

 Epidermis, 137 ; Rod-like bodies, 

 140 ; Muscular system, 142 ; Nervous 

 system, 146 ; Visceral nerves, 151 ; 

 Tactile setas, 152 ; Visual organs, 153 ; 

 Auditory organs, 156 ; Alimentary 

 canal, 157 ; Glandular organs of en- 

 teron, 164; Excretory organs, 173; 

 Generative organs, 179 ; Pore, 184. 



Tylopoda — Fore-limb, 483 ; Stomach, 559 ; 

 Blood-corpuscles, 576. 



Ungulata — Nipples, 422 ; Vertebral 

 column, 435 ; Paramastoids, 463 ; 

 Clavicle, 477 ; Fibiila, 494 ; Hallux, 

 491 ; Cerebellum, 510 ; Uterus, 616. 



Uuio — Muscles, 342 ; Nervous system, 

 345 ; Eiferent renal ducts, 376, Geni- 

 tal canal, 381. 



TJrodela— Vertebree, 432, 433 ; Shoulder, 

 girdle, 475 ; Pelvic-girdle, 484 ; Hind- 

 limb, 488 ; Brain, 505 ; Ductus en- 

 dolymphaticus, 534; Auditory os- 

 sicles, 538 ; Stomach, 537 ; Iliac 

 vein, 593 ; Lymphatic hearts, 599 ; 

 Kidneys, 604 ; Ureter, 601 ; Cloaca, 

 613. 



Uromastix — Sternum, 442. 



Ursina — Caecum, 562. 



Ursus — Eenal organs, 605. 



Vaginicola — Shells, 83. 



Varanus — Columella,458 ; Brachial plexus, 

 514; Tongue, 552. 



Vegetable Kingdom— Cells, 15 ; Tissues, 

 21. 



Velella — Generative persons, 97 ; Air-sac, 

 98 ; Hepatic canals, 118 ; Generative 

 products, 121. 



Vermes — Gastrula, 35 ; Dermal branchije, 

 36 ; Excretory organs, 46 ; Alimen- 

 tary canal, 47, 48 ; Eespiratory or. 

 gans of the cntcron, 49 ; Vascular 

 system, 50 ; Gemmation in, 61 ; Ho- 

 mology in, 64 ; Classification, 125 ; 

 Bibliography, 127 ; Form of body 

 128 ; Segmentation, 129 ; Muscular 

 system, 142 ; Visceral oi-gans, 153 ; 

 Auditory organs, 156 ; Alimentary 

 canal, 156 ; Coelom, 165 ; Generative 

 products, 190. 



Vertebrata — Branchial clefts, 7; Lungs, 

 10; Connective tissue, 24; Osseous 

 tissue, 28 ; Blood-corpuscles, 29 ; 

 Cartilaginous skeleton, 38 ; Muscu- 

 lature, 40 ; Excretory organs, 47 ; 

 Eespiratory organs of the enteron, 

 48 ; Homology in, 64j; General 



