B. Smith — Note on the Miocene Drum Fish. 281 



Explanation of Figures 1-9. 



Fig. 1. — Cynoseion nebulosus (C. and V.). Lower pharyngeals (functional 

 surface). Length along outer margin = 42 mm . Plates covered with 

 sharp denticles. 



Fig. 2. — Micropogon undulatus (L.). Lower pharyngeals (functional sur~ 

 face). Length along outer margin = 24 mm . Plates relatively broade 1 * 

 than in fig. 1, aud with large blunt denticles on the inner margin of each 

 plate. 



Fig. 3. — Pogonias cromis (L.). Lower pharyngeals (functional surface) of 

 young individual. Length along outer margin =38 mm . Plate fused, 

 crushing teeth developed in the central region, but many sharp denti- 

 cles still retained on the postero-lateral angles. 



Fig. 4— Pogonias cromis (L). Lower pharyngeals (functional surface) of 

 mature individual. Length along outer margin = 108 mra . An advance 

 on the condition shown in fig. 3. Denticles replaced by crushing teeth, 

 though these are sharper on the postero-lateral angles. 



Fig. 5 — Cynoseion nebulosus (C. and V.). Left upper pharyngeals (func- 

 tional surface). Length = 28 mm . AIL three plates covered with sharp 

 denticles. 



Fig. 6. — Micropogon undulatus (L). Left upper pharyngeals (functional 

 surface). Length = IT'S 111 ™. Second plate proportionately larger than 

 in fig. 5, its denticles larger and more blunt on the inner margin. 



Fig. 7. — Pogonias cromis (L.). Left upper pharyngeals (functional sur- 

 face) of young individual. Length = 32 m,n . Second plate proportion- 

 ately very large with crushing teeth developed on its inner margin, but 

 with many sharp denticles still retained on its outer margin. 



Fig. 8. — Pogonias cromis (L.). Second left upper pharyngeals (functional 

 surface) of mature individual. Length = 83 mm . An advance on the 

 condition shown in fig. 7, the crushing teeth occupying nearly the 

 entire plate with but a few denticles on the outer margin. 



Fig. 9 — Pogonias cromis (L.). Second left upper pharyngeal (dorsal sur- 

 face) of immature individual showing the processes for the attachment 

 of the epibranciiials. The fourth arch attaches to the large rounded 

 knob on the posterior margin, the third just forward and to the left, 

 and the second arch is attached to the process shown in the forward 

 central region of the plate. The process on the right is for muscular 

 attachment. Length = 42 mm . 



All the figures are arranged with the anterior end uppermost. 



