CONTENTS. 



XI. 



The Fbesh-watee Mussel. 



General structure — Respiratory organs — Alimentary organs — Circulatory 

 system — Excretory organs — Keproductive organs — Development — Laboratory 

 work. . . .... . . p. 104 — III. 



XII. 



The Feesh-watbb Ckateish and the Lobstbb. 



Habitat — General structure — Appendages — Segments — Alimentary canal — 

 Circulatory organs —Respiratory organs — The Green glands — Nervous system 

 — Sense organs — Reproductiye organs — Development — Laboratory work. 



p. 122 — 151. 



XIII. 



The Fbog. 



General characters — Development — Specific characters of Hana temporaria 

 and B. esculenta — The pleuroperitoneal cavity and the alimentary canal — The 

 neural canal and the cerebro-spinal axis — Objects seen on transverse sections 

 at various points — Comparison with lobster — The skeleton — The digestive 

 system — The blood and lymph vascular systems — The ductless glands — The 

 respiratory organs — The urinary organs — The generative organs — The nervous 

 system— The sense organs — Laboratory work. . . • P- '5^ — 257. 



Appendix p. 158. 



