291 



L.M.B.C. MEMOIRS 



No. XVI. CANCEE. 

 (The Edible Cbab.) 



JOSEPH PEARSON, M.Sc, 



Demonstrator in Zoology, University of Liverpool. 



CONTENTS. 



PAGE 



Introduction 292 



External Characters . . . 296 



Appendages 312 



Endophragmal System . .321 



Structure of Integument . 335 



Ecdysis 343 



Autotomy 346 



Muscular System .... 355 



Coelom and Body Cavity . 374 



Alimentary Canal : — 



General Description and 

 Histology 375 



Digestive Gland . . . .382 



Ossicles of Fore-gut . . 387 



Muscles of Fore-gut . . 393 





PAGE 



Blood Vascular System . 



400 



Respiratory System . . 



416 



Excretory System . . . 



426 



Nervous System . . . 



439 



Sense Organs .... 



446 



Reproductive System . . 



453 



Development .... 



459 



Economics and Bionomics :- 





General Habits . . 



463 



The Crab Fisheries . . 



467 



Size of Crabs at Maturity 



467 



Distribution and 





Migration .... 



469 



Bionomics of Ecdysis . 



473 



Description of Plates . . 



485 



