PLATE 4 
EXPLANATION OF FIGURES 
Figures 28 and 29 show the distribution of taste papillae and pharyngeal scales 
in the region of the mouth and pharynx of Squalus acanthias. 
28 The left half of a dogfish, ‘pup’ stage, showing the distribution of taste 
papillae over the floor, roof, and sides of the pharynx. 
29 The pharynx of an adult spiny dogfish laid open so as to show the distri- 
bution of taste papillae and pharyngeal scales. The floor of the pharynx is 
reflexed to the left in the figure. 
