INDEX 
Every reference is to the page: 
words in italics are names of genera or species ; figures 
in italics indicate that the reference relates to systematic position ; figures in thick 
type refer to an illustration ; f. = and in following page or pages ; n. = note. 
Abalius, 312 
Abdomen, of Malacostraca, 110 ; of Acan- 
tholithus, 178; of Birgus, 176; of 
Cenobita, 176 ; of Dermaturus, 178 ; of 
Hapalogaster, 178 ; of Lithodes, 178; 
of Pylopaqgurus, 178 ; of Trilobites, 235 ; 
of Scorpions, 297 ; of Pedipalpi, 309 ; 
of Spiders, 317 ; of Palpigradi, 422 ; of 
Solifugae, 426 ; of Pseudoscorpions, 431 ; 
of Podogona, 440 ; of Phalangidea, 440, 
443 ; of Acarina, 457 ; of Pentastoinida, 
489 ; of Pyenogonida, 502 
Abdominal glands, of Chernetidea, 432 
Abyssal region (marine), 204 ; (lacustrine), 
209 
Acantheis, 418 
Acanthephyra, 163 
Acanthephyridae, 763 
Acanthoctenus, 415 
Acanthodon, 3888 
Acanthogammarus, 138 
Acantholeberis, 53 
Acantholithus, 181; A. hystrix, 178 
Acanthophrynus, 313 
Acari, 454 (= Acarina, q.v.) 
Acaridea, 454 (= Acarina, q.v.) 
Acarina, 258, 454 f.; parasitic, 455; ex- 
ternal structure, 457 ; spinning organs, 
457 ; internal structure, 459; meta- 
morphosis, 462; classification, 464 
Acaste, 249 
Accola, 390 
Acerocare, 247 
Achelata, 529 
Achelia, 534; A. longipes, 506 
Achtheres, 75; A. percarum, 75 
Acidaspidae, 257 
Acidaspis, 226, 227, 230, 231, 235, 241, 
251; <A. dufrenoyi, 250; A. tubercu- 
lata, larva, 240; A. verneurli, 231; 
A. vesiculosa, 231 
Aciniform glands, 335, 349 
Acoloides saitidis, 367 
Acroperus, 53; A. leucocephalus, 52 
Acrosoma, 410 
Acrothoracica, 92 
Actaea, 191 ; habitat, 198 
Actinopodinae, 3S7 
Actinopus, 387 
Aculeus, of scorpion, 303 
Admetus, 313 
Aegidae, 126 
Aegisthus, 61 
Aeglea laevis, 169 ; distribution, 212 
Aegleidae, 169 
Aeglina, 227, 249; Ae. prisca, 248 
Agelena, 416 ; A. brunnea, 367 ; A. laby- 
rinthica, 352, 353, 378, 380, 381, 416; 
A. naevia, 339 
Agelenidae, 325, 352, 353, 415 
Ageleninae, 416 
Ageregate glands, 335, 349 
Aglaspis, 279 
Agnathaner, 66 
Agnathonia, 529 
Agnostidae, 244 
Agnostini, 245 
Agnostus, 222, 223, 225, 281, 2384, 245 ; 
A. integer, 245 
Agraulos, 247 
Agroeca, 3897 3 A. brunnea, cocoon, 358 
Albunea, 171 ; respiration, 170 ; distribu- 
tion, 201 
Albuneidae, 177 
Alcippe, 92; A. lampas, 92, 93 
Alcock, on Oxyrhyncha, 192; 
phorescence, 151 
Alepas, SO 
Alima, larva of Sqwilla, 143 
Alimentary canal, of Crustacea, 14; of 
Phylopoda, 28; of Cladocera, 42; of 
Squilla, 142; of Malacostraca, 110 ; of 
543 
