LIST OF ILLUSTRATIONS 



Xlll 



Mouth- Organs of Sheep-Tick, . .244 



English Sheep-Tick, . . .244 



Dog- or Sheep-Tick, . . .245 



Pigeon-Tick, . . . .245 



Cheese-Mite . . . .245 



Itch-Mite, . . . . .246 



Demodex folliculorum, . . . 246 



A Spider's Spinnerets, . . . 247 



Slender Sea-Spider, . . .248 



Shore-Spider, .... 249 

 Chinese King-Crab, . . . 250 



A Trilobite, . . . .252 



Nauplius Larva of Barnacle, . . 253 



Zosea Stage of Crab, . . . 254 



Jaws of Crayfish, . . . . 254 



Young Edible Crab, . . .256 



Swimming Crab, .... 256 

 Indian Land-Crab, . . . 257 



Swift Land-Crab, . . . .258 



Calling-Crab, . . . .258 



Thornback Crab, . . . .259 



Long-Beaked Spider-Crab, . . 261 



Dromia Crab, . . . .261 



Broad-Clawed Porcelain- Crab, . . 262 



One-Clawed Lobster, . . . 265 



Larva of Crayfish, . . . .266 



Slender- Clawed Crayfish, . . .266 



Common Crayfish, . . . 267 



Common Prawn, .... 268 

 West Indian Prawn, . . . 269 



Mussel-Prawn and Sponge-Prawn, . 270 



Hooded Shrimp, .... 270 

 Long-Necked Shrimp, . . .271 



Mantis-Shrimp, .... 272 

 Scrolls bromleyana, .... 274 

 Sphceroma, ..... 275 

 Male and Female Gnathia, . . 275 



Common and Pill Wood- Lice, . .276 



Fresh- Water Shrimp, . . .277 



Sand-Hopper, . . . .277 



Spiny Shrimp, . . . .277 



Gigantic Andania, . . . 278 



Skeleton-Shrimp, .... 278 

 Whale-Louse, . . . .279 



Transparent Ocean-Shrimp, . . 279 



Phronima, ..... 280 

 Barnacles attached to Pumice, . .281 



Acorn-Barnacle, .... 282 

 Stalkless Barnacle, . . . 282 



Parasitic Cirripedes, . . . 282 



Parasitic Barnacles, . . . 282 



Copepods, ..... 283 

 Fish-Lice, ..... 284 

 Spiny-Tailed Water-Flea, . . 285 



Egg-Capsule of Water-Flea, 



Glassy Leptodora, . 



Scale-Tailed Apus, 



Branchipus, and Brine Shrimp, 



Peripatus, ..... 



Anchor Sea-Cucumber, 



Sea-Cucumbers and Brittle-Star, . 



Ambulacral System of Starfish, . 



Group of Stone-Lilies, 



Lofoden Eoot-Crinoid, 



Medusa- Head Pentacrinid, 



Kosy Feather-Star and Sabella, . 



Parasitic Swellings on Crinoids, . 



Blue China Star-Fish, 



PedicellaricBj . . 



Starfish Turning Over, 



Common Brittle-Star, 



Edible Sea-Urchin, 



Jaws of Stone-Urchin, 



Shield-Urchin, .... 



Fiddle Heart- Urchin, 



Phial- Shaped Pourtalesia, 



Leather-Urchin, .... 



U-Shaped Sea- Cucumber, . 



A Deep-Sea Holothurian (Scotoplana), 



(Psychropotes), . 



Club-Like Sea-Cucumber, 

 A Plated Holothurian, 

 Green Snake-Star, .... 

 Development of a Sea-Urchin (Stages 1-8), 



(Stage 9), . 



(Stage 10), . 

 Young Sea-Urchin, 

 Brood-Pouch of Sea-Urchin, 

 Beak of Cuttle-Fish, 

 Common Octopus, . 

 Shell of Female Argonaut, 

 Male Argonaut, 

 Common Squid, 

 Sepiola, 



Shell of Spirula, . 

 Section of Shell of Pearly Nautilus, 

 A Ceratite, . 

 An Ammonite, 



Shell-Bearing Slug (Testacella\ . 

 Glass-Snail and Amber-Snail, 

 Black Slug, 

 Clausilia, . 



Agate-Snail (Achatina\ 

 Pythia scarabceus, . 

 Earlet Shell (Auricula), . 

 Embryo of River- Limpet, . 

 Teeth of Snails, . 

 Common Pond-Snail (Limncea), . 



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