CONTENTS 



Introduction 3 



Methods 3 



The structure of the gut of Nebalia bipes (Fabricius) .... 3 



The structure of the gut of Nebaliella extrema (f. Thiele) ... 3 



I. Fore-gut 3 



II. Mid- and hind-gut 6 



Musculature 7 



The structure of the gut of Nebaliopsis typica (Sars) .... 8 



Fore-gut 8 



Mid- and hind-gut 8 



Musculature 9 



The structure of the gut of Paranebalia longipes (Wilemoes Suhm) 1 1 



Mode of functioning of the gut of Nebalia bipes 12 



Mode of functioning of the gut of Nebaliella extrema . . . . 13 



Mode of functioning of the gut of Nebaliopsis typica .... 14 



Conclusions 15 



Bibliography 17 



