CONTEXTS. V 



PAGE 



Class IV. Holothuroidea, ....... 79 



Order 1. Pedata, . .79 



Order 2. Elasipoda, ....... 79 



Order 3. Apoda, . . . . . . . .79 



Phylum III. Arthropoda, . . . . . .81 



Class I. Crustacea, . . . . . .85 



Group A. Entomostraca, . . . . . .85 



Order 1. Phyllopoda, ..... . .85 



Order 2. Ostracoda, . . . . . - . .85 



Order 3. Copepoda, . . . . . . .85 



Order 4. Cirripedia, . . . . . . .85 



Group B. Leptostraca, . . . . . .87 



Group C. Malacostraca, . . . ' . . . .88 



Order 1. Arthrostraca (Edriophthalmata), . . . .88 



Order 2. Thoracostraca, . . . . . .88 



Class II. Arachnida, . . . ," . . .90 



Group A. Arachnida Branchiata, . . . . . .90 



Order 1. Xiphosura, . . . . . . .90 



Order 2. Eurypterina, . . . . . . .90 



Order3. Trilobita, . . : . . . . .90 



Group B. Arachnida Tracheata, . . . . . .92 



Order 1. Acarina, ....... 92 



Order 2. Pycnogonida (Pantopoda), . . . . .92 



Order 3. Tardigrada, ....... 92 



Order 4. Liuguatulidse, . . . . . .92 



Order 5. Araneida, . . * . . . . .92 



Order 6. Phalangidae, ....... 92 



Order 7. Pedipalpi, . . . . . . .92 



Order 8. Scorpionidee, ....... 92 



Order 9. Pseudoscorpionida 1 , . . . . . .92 



Order 10. Solifugse, ....... 92 



Class III. Protracheata, ....... 94 



Class IV. Myriapoda, ....... 96 



Order 1. Chilopoda, ....... 96 



Order 2. Chilognatha, . ... 96 



Class V. Insecta (Hexapoda), . . . . . .99 



Order 1. Orthoptera, ....... 99 



Order 2. Thysanura (Aptera), . . 99 



