256 THE SENSE-ORGANS AND PEEOEPTION OF FISHES. 



wlietlier tlie conger, &c., of the Nortli Sea would take pilcliard or 

 squid, wliicli tliey have probably never met in tlieir ordinary ex- 

 perience. 



DESCRIPTION OF PLATE XX. 



Illustrating Mr. Bateson's paper on " The Sense-organs and Per- 

 ceptions of Fishes ; with Remarks on the Supply of Bait.'" 



Fia. 1. — Head of a dab (Pleuronectes limanda), nat. size, showing the position of the 

 olfactory organ as seen when the skin is removed. ^ 



Fig. 2. — Diagrammatic representation of the right olfactory organ of the dab. 



Fig, 3. — Outline of the face of a megrim {Arnoglossus mec/astoma), showing the left 

 olfactory organ as seen when the skin is removed (nat. size). 



Fig. 4. — The olfactory plates of the left olfactory organ in a i\xvhot {Ehomhus maximus). 

 The dotted circles show the position of the nostrils, and the arrows the course of the 

 current. 



Fig. 5. — Diagram of a single olfactory plate in the turbot, showing the mode of attach- 

 ment to the rachis. 



Fig. 6. — Diagram of the pupil of the rough dog-fish {Scyllium canicula). a, by day j 

 h, by night. 



Fig. 7. — Pupil of skate (Rata bails) , a, by day ; h, by night. 



Fig. 8. — Eye of torpedo, a, by day ; b, by night. 



Fig. 9. — Pupil of angel-fish {Rhina squatind). a, by day; b, by night. 



Fig. 10. — Pupil of sterlet (Acipenser). a, by dayj b, by night. 



Fig. 10a. — Pupil of turbot (Rhombus maximus), a, by day ; b, by night. 



Fig. 11. — Longitudinal section of skin of barbel of rockling {Motella tricirrata), pre- 

 served with gold chloride to show the nerve-fibres traversing the skin to supply the " taste- 

 buds." Zeiss' obj. D, oc. 2. 



Fig. 12. — Horizontal section of skin of barbel of rockling {Motella tricirrata), to show 

 the immense numbers of " taste-buds" which it contains. Zeiss' obj. A, oc. 2. 



Fig. 13. — Vertical section of skin of lip of conger, showing a " taste-bud," and the nerve 

 running to it in a channel through the skin. Zeiss' obj. D, oc. 2. 



Fig. 14. — Vertical section of skin of pharynx of mullet (Mvgil), showing a row of " taste- 

 buds." Zeiss' obj. D, oc. 2. 



Fig. 15. — Cells of one of the " taste-buds " of a mullet {Mugil) macerated in Hertwig's 

 fluid. Zeiss' obj. F, oc. 2. 



Fig. 16. — Cells of "taste-bud" of pollack {Gadus pollacUus). Zeiss' obj. D, oc. 2. 



Fig. 17. — "Taste-bud" in skin of the tongue of an eel {Anguilla vulgaris), preserved 

 with gold chloride to show the ncrve-fibrea. Zeiss' obj. D, oc. 2. 



