566 



INDEX 



Tylaspis, 179 

 T}/2^hlocarcinus, 195 

 TypopeUis^ 312 

 Tyroglypliidae, 4^6 n. 

 Tyroglyphinae, ^6^6' 



Tyroglyphus, 464, 466, 481 ; T. lonc/ior, 

 466 ; T. siro, 466 



Uliodon, Jfl8 



Uloboridae, 350, 410 



Uloborinae, 41' J 



Uloborus, 362, 410 ; snare of, 352 ; U. 



republicanus, 411 ; U. walckenaerius, 



411 

 Unguis, 319, 320 

 Uroctea, 3'JJ ; U. durandi, 392 

 Urocteidae, 386, Sm 

 Urodacinae, 306, 307 

 Urodacus, 307 

 Uroplectes, 306 

 Uropoda, 4^1 

 Uropodiuae, ^7/ 

 Vrojiroctus, 312 

 Uropygi, S12 

 Vsofila, 393 



Valvifera, 127 



Vancoho, 362 



Veetius, 415 



Vejdovsky, 435 ii. 



Vejovidae, 300, 308 



Vejovis, SOS 



Vermiform i a, 404 



Verruca, 89, 91 



Verrucidae, 91 



Vesicle, of Scorpion, 303 



Vinson, 349, 360, 362 



Virbius, 164 ', T'. acuminatus, 164 ; 



habitat, 202 

 Vircliow, on liuman Pentastomids, 494 

 Viscid globules, on Spider web, 347 



Waite, 13 



Walckenaer, 365, 386 n., 408 n. 

 Wah-kencwra, 405 ; W. acicminata, 405 

 Walcott, on appendages of Trilobites, 236 ; 



on their development, 238 ; on early 



forms of Enrypterids, 283 n. 

 Wallace, 381 

 Wall-spider, 369 

 Warburton, C, on Arachnida, 295 f. , 344 



n., 349 n., 378 ii. 

 Ward, on Reighardia, 495 



Wasps and Spiilers, 368 



Water-mites, 460, 471, 472 



Water-spider, 357, 415 



Weismann, on Cladocera, 44, 49 



Weldon, W. F. R., on excretory glands, 

 13 ; on Branchiopoda, 18 f. ; on respira- 

 tion in Oo.rcinus, 189 



Westring, 327, 384 



Whale-louse, 502 



Wliip-scorpions, 309 



White, Gilbert, 342 



Wilder, 366 



WilletTwesia, 157 ; ir. inornata, 158 



Winkler, 463 



With, 473 n. 



Wolf-spiders, 341, 356, 359, 369, 375, 

 377, 381, 417 



Wood-Mason, 328 



Woods, H., on Trilobita, 219 f. ; on 

 fossil Xiphosura, 277 f. ; on Euryp- 

 terida, 281 f. 



Xanthidae, 191 

 Xantho, 191 ; habitat, 198 

 Xenobalanus globicipiiis, 92 

 Xiphocaris, 163 ; distribution, 210 

 Xiphosura, 25S, 259 f. ; classification, 



260, 276 ; fossil, 277 f. ; affinities with 



Eurypterida, 292 

 Xiphosura, S76 ; X. polyphemus, 276 

 Xiphosuridae, 276 

 XiphosUrinae, 276 

 Xysiims, 412 ; X. cristaUis, 412 ; X.piini, 



413 



Zacanihoides, 247 



Zaeslin, on the frequency of human Penta- 

 stomids, 494 



Zeriaiia, 429 



Zaia, 409 ; Z. x-notata, 359, 409 



Zimris, 396 



Zoaea, compared with Cumacea, 120 ; with 

 Erichthus, 143 ; Calyptopis of Eupih- 

 atisia, 144 ; of Feneus, 160 ; of Serges- 

 tidae, 161 ; of Porcdlana, 169, of 

 Birgus, 174 ; of Eupagurus, 179 ; of 

 Corystes cassivelaunus, 182 



Zodariidae, 317, 399 



Zodarion, 399 



Ziira, 397 ; Z. spinimana, 396 



Zoropsis, 415 



Zoropsidae, 413 



END OF VOL. IV 



Printed liy R. & R. Clark, Luiited, Edinburgh. 



