﻿CONTENTS. 



I. 



FROG. 



General characters Development Specific characters of Rana tem- 

 poraria and R. escuknta 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 setse 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. 



