562 



COMPARATIVE ANATOMY 



Tracheal lungs, 530 



Tracheata, 287 



Trachelius, 9 



Trachomedusce, 69 



Travisia, 181 



Trebius caudatus, 2d antennse, 310 



Trematoda, 134 



Tricenophorus, 134 



Trichina spiralis, 179, 179 



Trichobranchise, 328 



Trichocephahis dispar, 179 



Trichocyst, 13, 17 



Trichodactylus anonymus, sexual organs, 



533 



Trichodectes, 440 

 Trichodina, 11 

 Trichoplax adherens, 58, 60 

 Trichoptera, 441 

 Trichotrachelidce, 179 

 Tricladidce, 133; intestinal and nervous 



systems, 142 ; sexual organs, 156 

 Trigonoporus, 133 

 Trilobita, 414, 415 ; restored trunk seg- 



ment, 414 

 Trinudeus, 415 

 Tristomum, 134 

 Trochosa singoriensis, 516 

 Troctes, 440 

 Trombidiidce, 510 

 Trombidium fuliginosum, sexual organs, 



533 



Tuberella, 61 

 TuUcinella, 292 

 Tubificidce, 181 

 Tubipora, 70 

 Tubitelaria, 510 

 Tubularia larynx, 68 

 Turbellaria, 133 ; pharyngeal apparatus, 



139 ; excretory cell, 152 

 Tylenchus scandens, 178 

 Tympanal organ, 473 

 Typhlosolis, 206 

 Tyroglyphidce, 510 



Urochceta, 181 



Uropoda, 510 ; sexual organs, 534 

 Uropoda, 389 

 Urospora, 9 



,, Scenuridis, 9 

 Urostyla, 9 

 Uterus bell, 257 



VACUOLES, contractile, 17 ; noncoutrac- 



tile, 14 

 Velarium, 92 

 Velella, 70, 114 

 Velum, 75, 90 

 Vermes, 177-286 

 Versuridce, 101 

 Vesiculata, 94 

 Vespidce, 442 

 Vibracularia, 267 

 Vitellaria, 26, 155 

 Volvox, 8 



,, globatur, 21 

 Vortex, 134 

 Vorticella, 11 



,, microstoma, 10 

 Vorticeros, 134 



WALDHEIMIA, 185 



,, flavescens, 196 



Water-vascular system, 136 



XANTHO, 300 



Xestoleberis aurantia, mandibles, 311 



Xiphosura, 417-421 



Xylophaga, 442 



Xysticus, 510 

 YUNQIA, 133 



ZlLLA, 510 



Zocea.\aj:va, 298, 391, 392, 396 



Zoanthus, 71 

 Zoophyta, 58-132 

 Zona radiata, 28 



Zygote, 20 



THE END 



Printed by R. & R. CLARK, Edinburgh. 



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