CONTENTS. xvii 



CHAPTER XXXVII. 



General characters of the Gastropoda — Shell of the Gastropods — 

 Odontophore and respiratory organs of Gastropods — Classifica- 

 tion of Gastropods — Distribution of Gastropods in space — Dis- 

 tribution of Gastropods in time, 753-759 



CHAPTER XXXVIII. 



Branchiogastropoda — Characters of the Prosobranchiata — Patel- 

 lidas — Fissurellidae — Capulidae — Velutinidas — Pleurotomariidse 

 — Bellerophontidae — Haliotidse — Euomphalidas — Solariidae — 

 Trochidae — Turbinidse — Xenophoridae — Neritidse — Neritop- 

 sidae — Helicinidae — Naticidae — Paludinidae — Rissoidas — Littori- 

 nidse — Scalariidae — Ianthinidas — Turritellidae — Vermetidae — 

 Cascidag — Pyramidellidae — Pseudomelaniidas — Melaniidae — 

 Cyclostomidae — Aciculidse — Subulitidse — Nerineidae — Cerithi- 

 idae — Aporrhaidas — Strombidae — Cypraeidas — Cassididae — 

 Doliidae — Ficulidas — Tritoniidas — Buccinidae — Columbellidae 

 — Purpuridae — Fusidaa — Muricidae — Volutidas — Harpidas — Oli- 

 vidas — Cancellariidas — Conidae — Pleurotomidae — Terebridae, 760-799 



CHAPTER XXXIX. 



Characters of the Opisthobranchiata — Actasonidae — Bullidae — Aply- 

 siadas — Pleurobranchidas — Characters and distribution in time 

 of the Heteropoda — Firolidae — Atlantidae — Characters of the 

 Pteropoda — Limacinidae — Cavoliniidas — Cymbuliidae — Hyolith- 

 idae — Conulariidae — Tentaculitidas — Characters of the Pulmo- 

 gastropoda— Characters of the Stylommatophora — Testacellidae 

 — Limacidae — Helicidae — Characters of the Basommatophora — 

 Auriculidae — Limnaeidae — Siphonariidae — Gadiniidae, . . 800-815 



CHAPTER XL. 



Characters of the Polyplacophora — Characters and distribution of 

 the Chitonidae — Structure of the shell of Chiton — The Palae- 

 ozoic Chitons — Characters and distribution of the Scaphopoda 

 — Dentalium — Entalis — Siphonodentalium — Cadulus, . 816-820 



CHAPTER XLI. 



Characters of the Cephalopoda — Classification of the Cephalopoda 



— Distribution in space — Distribution in time, . . . 821-825 



