XIV CONTENTS. 



CHAPTER XLVIII. 



Divisions of the Gasteropoda Prosobranchiata Opisthobranchiata 

 Heteropoda Pulmonate Gasteropoda Families of the Gastero- 

 poda, 335-341 



CHAPTER XLIX. 

 Pteropoda General characters Divisions Families, . 342-343 



CHAPTER L. 



Cephalopoda General characters Arms Respiratory organs Re- 

 productive process Shell Divisions, 344-35 



CHAPTER LI. 



Dibranchiate Cephalopods General characters Octopoda Argon- 

 autidse Octopodidse Decapoda Teuthidse Sepiadae Spiru- 

 lidse Belemnitidse Tetrabranchiate Cephalopods Structure of 

 the Pearly Nautilus Shell of the Tetrabranchiata Nautilidse 

 Ammonitidse Families of the Cephalopoda, . . . 350-358 



CHAPTER LII. 

 Distribution of the Mollusca Proper in time, . 358-361 



Tabular view of the chief subdivisions of the Invertebrata, . . 361-365 



PART II.- VERTEBRATE ANIMALS. 



CHAPTER LIII. 



General characters of the Vertebrata Osseous system Digestive sys- 

 tem Blood Circulation Respiration Nervous system 

 Organs of sense Reproduction Divisions, . . . 369-385 



CHAPTER LIV. 



General characters of Fishes Integumentary system Osseous system 

 Fins Respiration Circulation Digestive system Swim- 

 bladder Nervous system Olfactory organs Reproduction, 386-399 



CHAPTER LV. 

 Pharyngobranchii Marsipobranchii, 400-405 



CHAPTER LVI. 



Teleostei Sub-orders Malacopteri Anacanthini Acanthopteri 



Plectognathi Lophobranchii, 405-412 



