INDEX. 
A. 
Abdomen of Arachnida, 80 ; 
of Crustacea, 13 
Acanthephyridae, 51 
Acanthogammarus, 46 
Acari, 109 
Acid-glands, 89 
Acorn-shells, 33 
Actinopus, 95 
Adaptation to Environment 
in Crustacea, 24 
Aegina, 46 (fig.) 
Aeglea , 63 
Aegleidae, 63 
Agelenidae, 92, 100 
Adbunea, 64 (fig.) 
Albuneidae, 64 
Alcock, 59 
Alima, 48 
Alipes, 127 
Alpheidae, 52 
Amblypygi, 89 
Amphipoda, 45 
Anadiastothele, 93 
Anartiostigma, 128 
Anaspides, 13, 37 (fig.) 
Andrews, 62 
Anelasmocephalus, 108 
Anepignatbi, 108 
Anomura, 59 
Anostraca, 26 
Antenna of Crustacea, 15 
Antennule of Crustacea, .15 
Antbracomarti, 107 
Ant-like Spiders, 100, 102 
Appendages of Crustacea, 
15 ; of Aracbnida, 80 ; of 
Trilobita, 78 ; of Onycho- 
pbora, 119 
Apseudes, 40 (fig.) 
Apus, 26 (fig.) 
Aracbnida, 9, 80 
Aracbnomorpbae, 96 
Arachnomysis, 39 
Aranea, 97 
Araneae, 91 
Arcturidae, 43 
Arcturus, 43, 44 (fig.) 
Arctus, 56 
Argas, 111 
Argasinae, 111 
Argiopidae, 97 
Argulus, 30 
Argyroneta, 101 
Artbrobranchia, 17 
Artbropoda, 9 
Artiostigma, 125 
Asellota, 42 
Asellus, 42 
Astacidae, 55 
Astacidea, 53 
Astacoides, 56 
Astacopsis, 55 (fig.), 56 
Astacus, 55 
Astigmata, 113 
Asymmetry in Crustacea, 
23 
Atractosoma, 122 
Atypidae, 96 
Atypus, 96 (fig.) 
Auditory organ, of Crus- 
tacea, 19 
Avebury, Lord, 124 
Avicularia, 95 
Aviculariidae, 94 
B. 
Balanus, 32 (fig.), 34 
Barnacles, sessile, 33 ; 
stalked, 32 
Basis, 15 
Bathynomus, 41 (fig.), 42 
Bdella, 113 
Bdellidae, 113 
Beetle-mites, 110 
Belinurus, 82 
Belisarius, 85 
Bird-eating Spiders, 94 
Birgus, 60, 61 (fig.) 
Black-currant Mite, 115 
Bopyrus, 44 
Boreonymphon, 115 (fig.), 
116 
Bothriuridae, 86 
Bothriurus, 86 
Brachydesmus, 123 
[ Brachyura, 64 
Brain of Crustacea, 19 
| Branchiae of Crustacea, 17 
j Branchial cavity, 15 ; la- 
mellae, 81 
Brancbiopoda, 25 
Branchiostegite, 15 
Brancbiura, 30 
Bristly Millipede, 121 (fig.) 
Broteas, 87 
Browne, 27 
Butheolus, 85 
Butbidae, 87 
Buthus, 85 (fig.), 86, 87 
Caerostris, 98 ; 
Galappa, 67, 70 
Calappidae, 67 
Gallianassa, 59 
Calling Crab, 74 
Calocalanus, 30 (fig.) 
Galommata, 96 
Calymene, 78 (fig.) 
Camarostome, 109 
Gambarus, 56 
Cancer, 72 
Cancridae, 72 
Capitulum, 32 
Caprellidae, 24, 47 
Caprellidea, 47 
Carapace of Crustacea, 13 ; 
of Aracbnida, 80 
Carcinoscorpius, 82 
Garcinus, 35, 44, 71 
Gar disoma, 74 
Caridea, 51 
Car pi Lius, 70 
Catometopa, 73 
Catophragmus, 33 
Caudal fork, 29 
Centipedes, 125 
Centrums, 86, 87 
Cephalic shield, 77 
Cepbalotborax of Crus- 
tacea, 14; of Arachnida, 80 
Ceratiocaridae, 37 
Cercophonius, 86 
K 
