66S 



INDEX 



Tone, 519 



Tooth, of Ophiothrix fragilis, 482 ; of 

 Echinus esculentus, 505, 524, 525 ; of 

 Echinarachnius parma, 546 



Tooth-papilla, of Ophiothrix fragilis, 482 ; 

 of Ophiocoma, 493 ; of Ophiocomidae, 

 499 



Topsent, 196, 218 n. 



Tornaria, 616 



Torquatella typica ( = Strombidium), 155 n. 



Torus angularis, of Ophiothrix fragilis, 482 



Toxa ( = a bow -shaped spicule without 

 spiral twist), 222 



Toxaspire (a spiral rod iu which the twist 

 a little exceeds a single revolution. The 

 pitch of the spiral being great the spicule 

 appears bow-shaped), 222 



Trabeculae, traversing ampullae of tube- 

 feet of Echinus esculentus, 517 ; travers- 

 ing coelom of Echinarachnius panna, 

 545 ; traversing coelom of Antedon 

 rosacea, 585 



Tracheae of Chondrophoridae, 309 



Trachelius, 137, 152 n. ; T. ovum, 153 ; 

 endosarc of, 144 



Trachelomonas, 110, 112 ; galvanotaxy of, 

 22 



Trachomedusae, 288 f. 



Trachynema, 29 If. > T. funerarium, 294 



Trachynemidae, 29//. 



Tractellum, 18, 114 



Tragosia, 224 



Transverse fission, of Flagellata, 109 f. ; of 

 Dinoflagellata, 110, 131 ; of Polykrikos, 

 131 ; of Ciliata, 147 ; of Suctoria, 161 



Transverse flagellum and groove, in Dino- 

 flagellata, 110, 130 f. ; multiple, in 

 Polykrikos, 132 



Transverse ( = tentacular) plane, 414 



Transverse section, of the arm of an 

 Asteroid, 443 ; of the arm of an Ophiu- 

 roid, 480 ; of the radius of an Echinoid, 

 518 ; of the radius of a Holothuroid, 562 ; 

 of body of a Holothuroid, 563 ; of arm 

 of Antedon, 586 



Trembley, 254, 255 



Trepang, 571 



Treponema, 111, 121 ; T. obermeieri, 121 ; 

 T. pallidum, 121 ; T. zeemannii, 120 



Triaene, 183, 224, 233 



"Triaxon, 184 



Trichaster, 501 



Trichasteridae, 501 



Trichites (hair -like spicules often occur- 

 ring in sheaves or clusters), 234 



Trichocysts, 142 f. ; of Chloromonadaceae, 

 113 n. ; Mitrophanow on, 142 n. ; adoral, 

 of Gymnostomaceae, 145 



Trichodina, 138, 158 



Trichodragmata (a sheaf of straight spicules 

 of hair-like fineness), 222 



Trichogorgia, 355 



Trichomonas, 111,115 ; conjugation, 116 n.; 

 T. vaginalis, 119 



Trichonympha, 111 



Trichonymphidae, 111, 123 f. ; flagella, 

 114 



Trichosphaerium, 51, 53 f. ; test, 53 ; life- 

 cycle, 54, 56 



Trichostemma, 216 



Trichostomata, 137 



Tridactyle pedicellariae, of Echinus escu- 

 lentus, 506, 507 : of E. acutus, 509 ; 

 of E. elegans, 510 ; of Echinarachnius 

 parma, 544 



Trifoliate pedicellariae, of Echinus escu- 

 lentus, 507, 508 ; of E. acutus, 509 ; of 

 E. alexandri, 510 ; of Echinocardium 

 cordojtum, 550 ; absent in Cidaridae, 534 



Trigonocidaris arbacina, 539 



Triloculina, 59, 66 



Trimastigidae, 111, 112 



Tripedalia cystophora, 319 



Tripedaliidae, 319 



Triplechinoid type of ambulacral plate, 

 531, 539 



Tripod, 83 ; -shaped spicule of Eadiolaria, 

 76 



Tripolis, 87 



Tripylaea, 76 



Trivium, of Echinarachnius parma, 543 ; 

 of Holothuria nigra, 561 



Trochammina, 59 



Trochocyathus, 399 ; T. hastatus, 398 



Trochocystis, 597 ', T. bohemicus, 597 



Trochoderma, 577 



Trochodota, 577 



Trochosmilia, Jfil 



Trochostoma, 575 ; T. violaceum, 575 



Trophodisc, 284 



Trophozooid, 388 



Tropical Africa, Trypanosomic diseases of, 

 119 f. 



Trout, black-spotted, destroyed by Hydra, 

 256 n. 



Trypanosoma, 111, 115 f., 119 f., 120 ; 

 podoplast or blepharoplast of, 19 n., 

 109 n. ; undulating membrane of, 115 ; 

 Halteridium, a supposed state of, 103 n., 

 120; affinities to Acystosporidae, 106; 

 morphology of, 120, 121 ; T. brucei 

 infests hoofed quadrupeds, 119 ; T. 

 evansii causes Surra disease in Rumi- 

 nants, 119 ; T. gambiense, cause of 

 sleeping-sickness, 120 ; T. lewisii, infests 

 Rodents, 119 ; T. nocluae,' 120 ; conjuga- 

 tion in, 116 n. 



Trypanosomoid character of blasts of 

 Acystosporidae, 106 



Tsetse Flies, intermediate hosts of Trypano- 

 somes of Nagana and sleeping-sickness, 

 119 f. 



Tube, of Phalansterium, 113 ; of certain 

 Ciliates, 152 ; of Maryna socialis, 152 ; 



