644 



INDEX. 



Thecidium— Metameres, 307; Generative 

 organs, 313. 



Thecomedusa? — Organisation, 98 ; Scy- 

 pliostoma form, 98 ; Strobila, 99 ; 

 Ephyra form, 99 ; Discophora of, 99. 



Thecosomata — Velum, 318, 321 ; Head, 

 321. 



Thelyphonus — Nervous system, 256. 



Thomisus — Trachea, 291. 



Thoracostraca — Optic nerves, 253 ; Ven- 

 tral chord, 251; Heart, 281; Female 

 organs, 291. 



Thylacinus — Marsupial bones, 407. 



Thysanopoda — Branchiae, 212. 



Thysanozoon — Tentacles, 133; Alimentary 

 canal, 158. 



Thysannra— Gnathites, 245; Feet, 246; 

 Ventral chord, 258 ; Eye, 265; Enteric 

 canal, 272 ; Trachea?, 288. 



Tinea — Goblet-shaped organs, 523. 



Tintinnns— Shells, 83. 



Tipulida?— 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 ; Antenna), 244 ; Ner- 

 vous system, 255 ; Salivary glands, 

 273 ; Liver, 275 ; Malpighiau vessels, 

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

 cretions, 278 ; Circulatory system, 

 282 ; Tracheae, 286. 



Trachelius — Contractile vesicles, 86. 



Trachynema— Tentacles, 102, 107 ; Mar. 

 ginal vesicles, 110. 



Tragulida — Stomach, 559. 



Trematoda — Sporocvst, 131 ; Cercaria?, 

 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 — Hcctocotyliscd arms, 327. 



Tricocephalus — Muscular system, 113. 



Trionyx— Plastron, 426. 



Tristoma — Excretory organs, 173. 



Triton— Lungs, 573 ; Heart, 581. 



Tubicola;— Tube, 134 ; Seta?, 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 ; Classification, 389 ; 



Form of body, 390 ; Integument, 

 393 ; Mantle, 393 ; Skeleton, 39 1 ; 

 Muscular system, 391 ; Nervous sys- 

 tem, 395 ; Sensory organs, 397 ; Ali- 

 mentary canal, 398 ; Ventral groove, 

 402 ; Sexual organs, 406. 



Turbellaria— Mouth, 129 ; Tentacles, 132 ; 

 Epidermis, 137 ; Rod-liko bodies, 

 140 ; Muscular system, 112 ; Nervous 

 system, 146 ; Visceral nerves, 151 ; 

 Tactile seta?, 152 ; Visual organs, 153 ; 

 Auditory organs, 156 ; Alimentary 

 canal, 157 ; Glandular organs of en. 

 teron, 161; Excretory organs, 173; 

 Generative organs, 179 ; Pore, 184. 



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

 Blood-corpuscles, 576. 



Ungulata — Nipples, 422 ; Vertebral 

 column, 435 ; Pai'amastoids, 463 ; 

 Clavicle, 477 ; Fibula, 494 ; Hallux, 

 491 ; Cerebellum, 510 ; Uterus, 616. 



Unio — Muscles, 342 ; Nervous system, 

 345 ; Efferent renal ducts, 376, Geni- 

 tal canal, 381. 



Urodela— Vertebra?, 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, 412. 



Ursina — Ca?cum, 562. 



Ursus — Kenal 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 branchiae 

 36 ; Excretory organs, 46 ; Alimen- 

 tary canal, 47, 48 ; Inspiratory or- 

 gans of the enteron, 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 organs, 153 ; 

 Auditory organs, 156 ; Alimentary 

 canal, 156 ; Ccelom, 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 ; 

 Respiratory organs of the enteron, 

 48 ; Homology in, 64J; General 



