INDEX. 



Tectibranchia, 482. 



Teeth of Aves, 375 ; of Cy- 

 clostomi, 434 ; of Gastro- 

 poda, 115, 116 and n; 

 Hirudo, 217; Mammalia, 

 5, 12, 13 ; Vertebrata, 348. 



Tegenaria, figure of digestive 

 organs, 304. 



Tegmen, 138, 142. 



Tegumen, 158. 



Teichonidae, 810. 



Teleosauria, 392. 



Teleostei, 431 ; v. Perca, 

 Gadus. 



Telolecithal ovum, xxvi. 



Telotrochae, 605. 



Telson, 162, 164, 171 ; of 

 Arachnida, 522. 



Tentacle sheath, 235. 



Tentacles, Helix, etc., 120; 

 labial, Anodonta, 129, 130, 

 xvi ; Tealia, 239, 241. 



Tentacular ganglion, Helix, 

 121. 



Tentaculifera = Acinetaria, 

 824. 



Tentaculitidae, 469. 



Tentaculocyst, 749, 751. .-/' 



Tenthredinidae, larvae, 149. 



Teredo, 484. 



Tergum, Arthropoda, 491. 



Tesselata, 576. 



Tesseroniae, 786, 788. 



Test, Ascidia, 102, 104 ; of 

 Echinoidea, 556; of Uro- 

 chorda, 441. 



Testamoebiformia, 894. 



Testicardines, 702. 



Tethys, 483. 



Tetrabranchiata, 464. 



Tetracoralla, 743. 



Tetractina, 810. 



Tetraphyllidae, 665. 



Tetrarhynchidae, 665. 



Tetronerythrin, 181. 



Textularidae, 895. 



Thalamophora, 884. 



Thaliacea, 447. 



Theca, 738. 



Thecidae, 469. 



Thecodont, 387. 



Thecosomata, 469. 



Thelyphonus, 529. 



Theriodontia, 392. 



Thread-cells of Myxine, 433 ; 

 of Fritillaria, 441 ; of 

 Non-palliata, 475 ; of Pro- 

 tozoa, 820; v. Nemato- 

 cysts. 



Thorax, Periplaneta, 141 ; 

 Sphinx, larva, 148 ; pupa, 

 153; imago, 157; of Ar- 

 thropoda, 491. 



Thymus, Aves, 56 ; Rana, 

 77 ; Teleostei, 88 ; Verte- 

 brata, 350. 



Thyroid, Aves, 56 ; Rana, 

 77-8 ; Teleostei, 88 ; Ver- 

 tebrata, 350. 



Thysanoptera, 510. 



Thysanura, xvi, 509. 



Tibia, Insectan, 141 ; v. 

 Hind-limb, Vertebrata. 



Tibio-tarsus, 62. 



Tiedemann's bodies or vesi- 

 cles, 193, 595. 



Tillodontia, 39. 



Toe, sixth, 81, 82, 400. 



Tornaria, 591, 592. 



Trabeculae cranii, 337. 



Tracheal gills of Insecta, 506. 



Tracheal sac of Myriapoda, 

 517; Arachnida, 527. 



Tracheal tubes of Arthro- 

 poda, 494 ; of Insecta, 144, 

 145, 505; Myriapoda, 517; 

 Protracheata, 521. 



Tracheata, 496. 



Trachomedusae, 750, 754, 

 776. 



Trachymedusae, 749-755, 

 776. 



Trapezium, v. Carpus. 



Trapezoid, v. Carpus. 



Trematoda, 642-655 ; repro- 

 ductive cells of Redia and 

 Sporocyst, xxiii. 



Trichina, 686. 



Trichobranchia, 183. 



Trichocysts, Protozoa, 255, 

 332, 820. 



Trichoplax, 817. 



Trichoptera, 510. 



Trigonellites, 456 n. 



Trigoniacea, 490. 



Trilobita, 529. 



Trimorphism, 238. 



Tripylea, v. Phaeodaria, 883. 



Tristomeae, 653. 



Triton, paedogenesis, 408. 



Trivium, Asterias, 191, 311 ; 

 of Holothurioidea, 550. 



Trochanter, 141. 



Trochosphere of Mollusca, 

 454 ; Vermes, 583 ; Chae- 

 topoda, 605, 606; Ar- 

 chi-annelida, 615 ; Echiu- 

 rus, 623. 



Trochozoon, 584. 



Trophosome, 245. 



Tropidonotus, dissection of, 

 67-72 ; circulatory and 

 other systems, 69, 70; 

 poison glands, Ophidia, 71. 



Truncus arteriosus, 351. 



Trygonorhina, 429 n. 



Tube feet of Echinodermata, 

 546,551,560,565,567,569; 

 homologues of in Crinoi- 

 dea, 575. 



Tubiporidae, 732 ; skeleton, 

 727, 729. 



Tubulariae, 246, 776. 



Tunica granulosa, 357. 



Tunicata= Urochorda. 



Turbellaria, 666-674 ; rela- 

 tions to Ctenophora, 578, 



673- 



Turret zooids, 237. 

 Typhlosole, Ascidia, 104 ; 



Anodonta, 132; Lumbri- 



cus,202; Cyclostomi, 435 ; 



Chaetopoda, 600. 



U. 



Udonellidae, 653. 



Ulna, v. Fore-limb, Verte- 

 brata. 



Umbilical vesicle, 358. 



Umbilicus of shell, 107. 



Umbo of shell, 124. 



Umbrella, Medusa, 248, 745. 



Uncinate processes, 60, 374. 



Uncus, 158. 



Ungulata, 368. 



Unionacea, 490. 



Urinary bladder, 355-356; of 

 Pisces, 427 ; Teleostei, 88. 



Urochorda, 441-448 ; v. As- 

 cidia. 



Urodela, 408. 



Urogenital canal, 36. 



Urogenital sinus, Teleostei, 

 89; Vertebrata, 355. 



Urohyal, 93. 



Uropygial gland, 50. 



Urostyle, Rana^o, 82 ; Te- 

 leostei, 94, 4r$t 



Uterus rnasculinus, 30, 33,, 



34, 356. 

 Uterus duplex, bicorms, sim- 



plex, etc., 35, 38, 367. 

 Utricle, 347. 



V. 



Vacuoles, contractile, 255, 



820 ; food do., 820. 

 Vagina, 35. 

 Vaginulus, tentacles, 120 ; 



pedal nervous system, I2U 

 Valencinia, 641. 

 Vampyrella, 918. 

 Vase-fibrous tissue. Hirudo> 



215. 

 Veliger of Mollusca, 454, 469, 



472, 474, 481, 489. 

 Velum of Cyclostomi, 349, 



435 ; of Amphioxus, 438 ; 



