xiv CONTENTS; 



CHAPTER XLVIIL 



Divisions of the Gasteropoda— Prosobranchiata—Opisthobranchiata— 

 Heteropoda — Pulmonale Gasteropoda — Families of the Gastero- 

 poda, 3i3-3'9 



CHAPTER XLIX. 

 Pteropoda — General characters— Divisions— Families, . . 320-321 



CHAPTER L. 



Cephalopoda — General characters^Arm? — Respiratory organs — Re- 

 productive process — Shell — Divisions, 322-327 



CHAPTER LI. 



Dibranchiate Cephalopods— General characters — Octopoda — Argon- 

 autidsE — Octopodid^ — Decapoda — Teuthidje — Sepiadse— Spiru- 

 lidoe — Belemnitidse — Tetrabranchiate Cephalopods— Structure- of 

 the Pearly Nautilus— Shell of the Tetrabranchiata- Nautilidje — 

 Aramonitidae — Families of the Cephalopoda, . . . 327-33S 



CHAPTER LII. 

 Distribution of the MoUusca Proper in time, .... 336-338 



Tabular view of the chief subdivisions of the Invertebrata, . . 339-342 



PART II. —VERTEBRATE ANIMALS. 



CHAPTER LIII. 



General characters of the Vertebrata — Osseous system— Digestive sys- 

 tem — Blood — r- Circulation — Respiratioii — Nervous system — 

 Organs of sense — Reproduction — Divisions, . . . 345-361 



CHAPTER LIV. 



General characters of Fishes — ^Integumentary ^stem — Osseous, system 

 — Fins — Respiration — Circulation — Digestive system — Swim- 

 bladder — Nervous system — Olfactory organs — Reproduction, 362.375 



CHAPTER LV. 

 Pharyngobranchii — ^Marsipobranchii, ...•■. 376-381 



CHAPTER LVI. 



Teleostei — Sub-orders — Malacopteri — Anacanthini — Acanlhopteri — 

 Plectognathi — Lophobranchii, 381-38S 



