SEA-FISHERIES LABORATORY. 233 



Text-Fig. 4. Structure of the Gills : 



Raker 



R.Pos.'-rremaHcus dorsalisJX 

 ^'Branchial arch. 

 > Afferent branchial vessel. 

 ^ R. Pre. Iremah'cus primus X. 

 „.-R Posr-rremancus venlralis IX. 

 --AFFerenr branchial' vessel. 



Base of gill ray.. 



Filamenfar rnuscie 



Vascular lamell; 



J. J. de L 



A. Diagrammatic transverse section through Branchial arch I. B. Trans- 

 verse section of a double filament, showing the surfaces of two lamellae. 

 C. Longitudinal section of a single filament in a plane at right angles to A. 



