L.M.B.C. MEMOIRS 



No. XVI. CANCER. 



JOSEPH PEARSON, M.Sc.,' 



Demonstrator in Zoology, University of Liverpool. 



CONTENTS. 



PAGE 



Introduction 2 



External Characters ... 6 



Appendages 22 



Endophragmal System . . 31 



Structure of Integument . 45 



Ecdysis 53 



Autotomy 56 



Muscular System .... 65 



Coelom and Body Cavity . 84 

 Alimentary Canal : 



General Description and 



Histology 85 



Digestive Gland .... 92 



Ossicles of Fore-gut . . 97 



Muscles of Fore-gut . . 103 



PAGE 



Blood Vascular System . .110 

 Respiratory System . . . 126 

 Excretory System .... 136 

 Nervous System .... 149 



Sense Organs 156 



Reproductive System . . . . 1 63 



Development 169 



Economics and Bionomics : 

 General Habits .... 173 

 The Crab Fisheries . . .177 

 Size of Crabs at Maturity 177 



Distribution and 



Migration 179 



Bionomics of Ecdysis . . 183 

 Description of Plates . . . 195 



