Xll CONTENTS. 



and distribution of the Araneida Characters and distribution 

 of the Myriapoda Characters and distribution in time of the 

 Insecta, 181-187 



CHAPTER XVIII. 



General characters of the Mollusca General characters of the shell of 

 the Molluscs General distribution of the Mollusca in time Divi- 

 sions of the Mollusca Characters of the Polyzoa Structure of 

 the polypides and colonies of the Polyzoa Divisions of the Poly- 

 zoa Distribution of the Polyzoa in time, .... 187-198 



CHAPTER XIX. 



General characters of the Brachiopoda Structure of the shell of the 

 Brachiopods Oral processes and their supports Divisions of the 

 Brachiopods General distribution of the Brachiopoda in time 

 Characters, distribution in time, and leading genera of the Tere- 

 bratulidse Thecididae Spiriferidae Kininckida; Rhynchonel- 

 lidae Strophomenidse Productidae Craniadae Discinidse 

 Lingulidae, 198-214 



CHAPTER XX. 



General characters of the Lamellibranchiata Shell of the Lamelli- 

 branchs General distribution of the Lamellibranchiata in time 

 Ostreidae Aviculidse Mytilidae Arcadae Trigoniadae Union- 

 idse Chamidae Hippuritidae Tridacnidae Cardiadae Lucin- 

 idae Cycladidse Cyprinidae Veneridas Mactridae Tellinidae 



Solenidae Myacidae Anatinidse Gastrochaenidae Pholad- 

 idae, 214-240 



CHAPTER XXL 



General characters of the Gasteropoda Shell of the Gasteropods 

 Siphonostomatous and Holostomatous Univalves Table of the 

 divisions of the Gasteropoda General distribution of the Gastero- 

 poda in time Strombidae Muricidse Buccinidae Conidae 

 Volutidae Cypraeidse Naticidae Pyramidellidse Cerithiadae 

 Melaniadse Turritellidae Littorinidae Paludinidae Neritidse 



Turbinidae Haliotidse Fissurellidae Calyptrseidae Patel- 

 lidae Dentalidse Chitonidse Opisthobranchiate Gasteropods 

 Tornatellidae Bullidae Aphysiadae Pleurobranchidae, . 240-262 



CHAPTER XXII. 



Heteropoda Firolidae Atlantidae Pulmonate Gasteropods Heli- 

 cidae Limacidae Limnasidas Auriculidae Cyclostomidae 

 Aciculidae, 262-268 



CHAPTER XXIII. 



General characters of the Pteropoda General distribution of the 

 Pteropoda in time Hyalea Theca Conularia Tenta- 

 culites, 269-272 



