CONTENTS. XV 



CHAPTER XLI. 



Molluscoida Polyzoa Distinctions between the Polyzoa and Hy- 

 drozoa Polypide of the Polyzoa Anatomy of the Polyzoa 

 Reproduction and development Divisions of the Polyzoa 

 Affinities of the Polyzoa Distribution of the Polyzoa in 

 space, . - . . ^ J 37i-38o 



CHAPTER XLII. 



Tunicata General characters Development Types of Homolo- 



gies Divisions Distribution of Tunicata in space and time, 380-388 



CHAPTER XLIII. 



Brachiopoda General characters Shell Arms Atrial system De- 

 velopment of Affinities of Divisions of Distribution of, in , 

 space and time, . . . .^'.; t .-^ . . . 388-395 



CHAPTER XLIV. 



(.General characters and divisions of the Mollusca Proper Lamelli- ' 

 / branchiata General characters and anatomy Divisions Distri- 

 bution of the Lamellibranchiata in time, . . . 396-404 



CHAPTER XLV. 



Encephala Gasteropoda General characters Development Shell 



of Gasteropoda, .,' ; :':.! ;;;; V|i /. :; j. . 405-411 



CHAPTER X'LVI. 



Divisions of the Gasteropoda Prosobranchiata Opisthobranchiata 

 Heteropoda Pulmonate Gasteropoda Distribution of Gastero- 

 poda in space and time, ....... 411-416 



CHAPTER XLVII. 



Pteropoda General characters Divisions Families Distribution 



in time, . ... -r ...... ,_.,,.i . . . . . 416-418 



CHAPTER XLVIII. 



/Cephalopoda General characters Arms Respiratory organs Re- 

 productive process Shell, ....... 418-426 



CHAPTER XLIX. 



Dibranchiate Cephalopods General characters Octopoda Argon- 

 autidse Octopodidse Decapoda Teuthidse Sepiadae Spiru- 

 lid^e Belemnitidae Tetrabranchiate Cephalopods Structure of 

 the Pearly Nautilus Shell of the Tetrabranchiata Nautilidae 

 Ammonitidge Distribution of the Cephalopoda in space and time 

 Literature of Mollusca, ....... 426-44 1 



CHAPTER L. 



^General characters of the Vertebrata Osseous system Digestive sys- 

 tem Blood Circulation Respiration -Nervous system 

 Organs of sense Reproduction Divisions General litera- 

 ture, 443-46o 



