viii CONTENTS 



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(Turbinellidtz) Whelks (Buccinidce} Dog Whelks (Nassida:} Dove Shells 

 ( Columbellidce) Murices (Muricidtz) Section Toenioglossa Tritons ( Tritonidce') 



Tun Shells (Doliidce} Cowries (Cyprczidce) Wing-Shells (Strombidce) 

 Cerithiidce Worm-Shells ( Vermetidcz) Melaniidcz Strcpomatidte Peri- 

 winkles (Littorintdte) Rissoidce Hydrobiidce Viviparous Pond Snails ( Vivi- 

 paridce Valvatidce Ampullariidce Cyclophoridce Cyclostomatidce Trunca- 

 tellidce Hipponychidce Calyptr&idce Xenophoridce Naticidce Section 

 Ptenoglossa Violet Snails (lanthinidce) Wentletraps (Scalariidce) Section 

 Gymnoglossa Eulimidce Pyramidellidce Suborder Heteropoda Ptero- 

 tracheidce Atlantidce Suborder Scutibranchiata Section Rhipidoglossa 

 HelicenidcB Neritidce Turbinidce Trochidce Delphinulidce Ormers 

 {Haliotidce} Pleurotomariidce Keyhole Limpets {Fissurellidce} Section Doco- 

 glossa AcmceidcE Limpets (Patellidcz) Lepetidce, .... 3310 



CHAPTER XI. MOLLUSKS, concluded. Classes Amphineura, Scaphopoda, and 



Pelecypoda. 



The Chiton Group (Class Amphineura) Chitons (Order Polyplacophora) Order 

 Aplacophora The Toothshells (Class Scaphopoda) -. The Bivalves (Class Pelecy- 

 poda Order Protobranchiata Order Filibranchiata Order Pseudolamelli- 

 branchiata Order Eulamellibrancliiata Suborder Submytilacea Suborder 

 Tellinacea Suborder Veneracea Suborder Cardiacea Suborder Myacea 

 Suborder Pholadacea Suborder A natinacea Order Septibranchiata, . . 3368 



CHAPTER XII. Moss ANIMALS AND LAMP SHELLS, Subkingdom Molluskoidea. 



The Moss Animals (Class Bryozoa) Characteristics of the Group Subclass Ectoprocta 



Order Phylactolcemata Order Gymnolczmata Subclass Endoprocta The Lamp 

 Shells (Class Brachiopoda) and Their Characteristics Hinged Group (Order 

 Testicardines) Hingeless Group (Order Ecardines}, . . . . . 3390 



CHAPTER XIII. THE WORM-LIKE ANIMALS, Subkingdom Vermes. 



Characteristics of Worms Bristle Worms or Annelids (Class Annelida} Their Distinc- 

 tive Features Many-Bristled Group (Order Polychczta) Sparsely-Bristled Group 

 (Order Oligochceta) The Leeches (Class Hirudined) The Gephyrean Worms 

 (Class Gephyrea} The Wheel Animalcules (Class Rotifera) The Thread- 

 worms or Roundworms (Class Nematohelminthes) Spiny-Headed Thread- 

 worms (Order Acanthocephali) Typical Threadworms (Order Nematoidea} 

 Arrowworms (Order Chcetognatha} The Nemertine Worms (Class Nemertinea) 



The Flatworms (Class Platyhelmintftes} Tapeworms (Order Cestoda) 

 Trematode Worms (Order Trematoda) Many-Suckered Group (Suborder Poly- 

 sfome<z) Two-Suckered Group (Suborder Distomece) Turbellarian Worms 

 (Order Turbellaria} Suborder Rhabdoccela Suborder Dendroccela Group of 

 Uncertain Position (Orthonectida: and Dicyemidcz), ..... 3404 



CHAPTER XIV. JELLYFISH, CORALS, AND SEA ANEMONES, Subkingdom 



Ccelenterata. 



Distinctive Features of Coelenterates The Ctenophores (Group Ctenophora} Stinging 

 Series (Group Cnidaria) The Jellyfish and Their Allies (Class Polypomedusce) 

 Order Siphonophora Order Hydromedusce Fresh - Water Forms Order 

 Scyphomedusce The Sea Anemones and Corals (Class Anthozoa) Six-Rayed 

 Polyps (Order Hexactinia) Horny Corals (Antipatharia) Eight-Rayed Polyps 

 (Order Octactinia) Coral Reefs and Islands, ..... 3448 



