CONTENTS. 

 I. 



FROG. 



General characters Development Specific characters of Rana tem- 

 poraria and R. esculenta Splanchnic (pleuro-peritoneal) cavity and 

 the organs of the viscera Neural cavity and the cerebro-spinal axis 

 Comparison of transverse sections across the head and trunk General 

 comparison with Lobster and Crayfish Skeleton Digestive system 

 Lymph and blood vascular systems Heart Respiratory organs and 

 respiration Urinogenital system Ductless glands Nervous system 

 Sense organs and integument Laboratory work . . pp. i 172. 



II. 



FRESH-WATER CRAYFISH AND LOBSTER. 



Habitat General structure Exoskeleton and appendages Diges- 

 tive system Circulatory system and heart Respiratory system Excre- 

 tory organs Nervous system and sense organs Reproductive organs 

 Development Ecdysis Laboratory work. . . pp. 173 239. 



III. 



EARTHWORM. 



Habitat General external characters Exoskeleton and setae Di- 

 gestive system General structure of body wall and alimentary canal- 

 Body cavity and mesenteries Excretory system Circulatory system 

 Neurosensiferous system- Reproductive organs Development Clitel- 

 lum Laboratory work. ...... pp. 240 271. 



