CONTENTS. 



PAGE 



General Statement, ....... 5 



Trawling Investigations, ...... 6 



Investigations on the Rate of Growth of Fishes, . . 7 



The Hatching and Rearing of Food-Fishes, ... 8 



The Life-History of the Crab, ..... 9 



The Young of the Witch Sole, ..... 10 



The Marine Crustacea, ...... 10 



The Parasites of Fishes, ...... 11 



The Young of the Conger, . . . . .11 



Investigations on the Herring in the Firth of Clyde, , . 12 



SCIENTIFIC REPORTS. 



I. Trawling Investigations. By Dr. T. Wemyss Fulton, F.R.S.E., 



Superintendent of Scientific Investigations, . . 13 



Introductory, . . . . . .13 



The Proportion of Marketable to Unmarketable Fishes, 13 

 The Proportion of Immature Fish Landed, . , 16 



Investigations in the Moray Firth and Aberdeen Bay, 19 

 Table I., . . . . . .50 



Table II., ...... 89 



II. Contributions to the Life-Histories of the Edible Crab (Cancer 



Pagurus) and of other Decapod Crustacea : — Impregna- 

 tion : Spawning : Casting : Distribution : Rate of Growth. 

 By H. Chas. Williamson, M.A., D.Sc, Marine Laboratory, 

 Aberdeen (Plates'! -"V.), . . . . .100 



The Impregnation of Cancer pagurus, . . . 101 



The Muscular System of the Abdomen of the 



Male Crab, . . . . .103 



The Action of the Penis, . . . .104 



The Condition of the Spermatheca, . . 105 



The Impregnation of Carcinus mcenas, . . 107 



The Spawning of Cancer pagurus, . . . 108 



The Mode of Attachment of the Eggs to the 



Swimmeret, ..... 108 



The Swimmeret, ..... 110 



The Endopodite, . . . . .110 



The Exopodite, . . . . .111 



The Ripe Egg, . . . . .112 



The Attachment of the Eggs, , . . 115 



The Sloughing of the Empty Egg-capsules, . 116 

 The Attachment of the Eggs in other Decapod 



Crustacea, . . . . . .116 



The Spawning of Carcinus mcenas, . . . 120 



The Casting, Distribution, and Rate of Growth of 



Cancer pagurus, . . . . .121 



The Migrations of Cancer pagurus, . . . 135 



The Changes in the Carapace of Cancer pagurus, . 136 

 Literature, ...... 137 



Explanation of the Plates, .... 138 



