CONTENTS vii 



PAGE 



Typical Group (Suborder Opisthothelce} The Various Tribes and Families of the 

 Same The False Spiders (Order Solifugce} The False Scorpions (Order Pseu- 

 doscorpiones) The Harvest Spiders (Order Opiliones) Suborder Laniatores 

 Suborder Palpatores Group Ricinulei The Mites and Ticks (Order Acari) 

 Aberrant Types, .......... 3170 



CHAPTER VII. THE JOINTED ANIMALS, concluded. THE SEA SPIDERS, KING 

 CRABS, CRUSTACEANS, etc., Classes Pantopoda, Gigantostraca, Crustacea, etc. 



Characteristics of Sea Spiders The King Crabs (Class Gigantostraca) Existing Forms 

 (Order Xiphosura) Order Merostomata Order Trilobita Crabs, Lobsters, 

 Clawfish, etc. (Class Crustacea) Characteristics of the Class Typical Crusta- 

 ceans (Subclass Malacostraca) Order Decapoda Short-Tailed Group (Suborder 

 Brachjyura) Long-Tailed Group (Suborder Macrura) Cleft-Footed Group 

 (Order Schizopoda) The Mantis Shrimps (Order Stomatopoda) Sessile-Eyed 

 Series (Edriophthalmata) Order Isopoda Order Amphipoda Subclass Entomo- 

 straca The Barnacles (Order Cirripedia) Bivalved Group (Order Ostracoda) 

 Oar-Footed Group (Order Copepoda) Order Cladocera Leaf-Footed Group 

 (Order Phyllopoda) Class Prototracheata, ...... 3215 



CHAPTER VIII. STONE LILIES, STARFISHES, SEA URCHINS, AND SEA 

 CUCUMBERS, Subkingdom Echinodermata. 



CHARACTERISTICS OF THE GROUP Distinction of the Classes Mode of Life The Cystids 

 (Class Cystidea) The Stone Lilies or Crinoids (Class Crinoidea) The Blastoids 

 (Class Iasfoidea) The Starfishes (Class Asteroidea) The Brittle Stars (Class 

 Ophiuroidea) The Sea Urchins (Class Echinoidea) The Sea Cucumbers (Class 

 Holothuroidea) Development of Echinoderms, ..... 3256 



CHAPTER IX. THE MOLLUSKS OR SHELLFISH, Subkingdom Molluska. 



Definition of the Group Growth Coloration Age Reproductive System Food 

 Organs of Sense Locomotion Uses in Nature and to Man Noxious Mollusks 



Distribution Classification Squids, Cuttlefishes, and Nautili (Class Cephalo- 

 poda') Characteristics Two-Gilled Group (Order Dibranchiata) Octopus Tribe 

 ( Octopodidce} Other Families A rgonautidcz Suborder Decapoda Squids 

 (Loliginidcz) Sepiolidce Onychoteuthidce and Chiroteuthidce True Cuttlefishes 

 (Sepiedce) Spirulidce Four-Gilled Group (Order Tetrabranchtata) Nautil- 



idcz Allied Families, ....... . 3288 



CHAPTER X. THE MOLLUSKS, continued. Class Gastropoda. 



Distinctive Features of Gastropods Lung-Breathing Group (Order Pulmonata) Sub- 

 order Stylommatophora Shelled Slugs (Testacellidce) True Slugs (Limacidce) 

 The Snail Tribe (Helicidcz) Other Families Suborder Basommatophora Ear- 

 let Shells (A uriculidce) Pond Snails, etc. (Limntzidce, Phvsida, and Chilinidce) 



Hind-Gilled Group (Order Opisthobranchiata) Naked-Gilled Subgroup (Sub- 

 order Nudtbranchiata) Section Anthobranchiata Doris Tribe (Doridopsidce, 

 Doridtz, etc.) Section Inferobranchiata Section Polybranchiata Section Pelli- 

 branchiata Section Parasita Covered-Gilled Subgroup (Suborder Tecti- 

 branchiata) Suborder Pteropoda Sections Gymnosomata and Thecosomata 

 Front-Gilled Group(Order Prosobranchiata) Suborder Pectinibranchiata Section 

 Toxoglossa Cones (Conidce) Auger Shells (Terebridce) Pleurotomidce Can- 

 cellariidce Section Rhachiglossa Olives (Olividtz) Harps (Harpidce) Mar- 

 ginellida: Volutes ( Volutidce) Tulip Shells (Fasciolariidce) Chank Shells 



