xii 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- 

 bratulidae Thecididae Spiriferidae Kininckidoe Rhynchonel- 

 lidae Strophomenidae Productidse Craniadae Discinidae 

 Lingulidae 198-214 



CHAPTER XX. 



General characters of the Lamellibranchiata Shell of the Lamelli- 

 branchs General distribution of the Lamellibranchiata in time 

 Ostreidae Aviculidae Mytilidoe Arcadae Trigoniadae Union- 

 idae Chamidas Hippuritidae Tridacnidse Cardiadae Lucin- 

 idae Cycladidre Cyprinidae Veneridae Mactridae Tellinidae 



Solenidae Myacidae Anatinidae Gastrochaenidae Pholad- 

 idae, 214-240 



CHAPTER XXI. 



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 Muricidae Buccinidae Conidae 

 Volutidae Cypneidae Naticidae Pyramidellidae Cerithiadae 

 Melaniadac Turritellidae Littorinidae Paludinidse Neritidae 



Turbinidae Haliotida: Fissurellidae Calyptrseidae Patel- 

 lidat Dentalidse Chitonidae Opisthobranchiate Gasteropods 

 Tornatcllida; Bullidae Aphysiadae Pleurobranchida;, . 240-262 



CHAPTER XXII. 



Heteropoda Firolidas Atlantidae Pulmonate Gasteropods Heli- 

 cidz Limacidae Limmcidae Auriculidae Cyclostomidae 

 Aciculid*, 262-268 



CHAPTER XXIII. 



General characters of the Pteropoda General distribution of the 

 Pteropoda in time Hyalea Theca Conularia Tenta- 

 culites, i . 269-272 



