Fishes of the Western North Atlantic 



37 



p. pectinatus)\ about 4.5-5.0 times as long as broad; their longitudinal axes nearly 

 transverse to main axis of saw; the basal eight or nine teeth on each side dipping down- 

 ward, about on a plane with slope of upper surface of saw on their side, but the more 

 distal teeth extending about horizontally; their average lengths about Vs as great as width 

 of saw, but varying considerably from tooth to tooth and without any regular gradation 



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Figure 6. Pristis perrotteti. ^Dried saw of specimen about 865 mm long (calculated length), from Lake Yzabel, 

 Guatemala (U. S. Nat. Mus., No. 11 1423), about 0.4X. 5 Saw teeth from same, about 0.8 X. C Oblique view 

 of saw tooth from same, about 1.2 X. D Eye and spiracle of juvenile male, about 1,376 mm long, from Lake 

 Nicaragua (U. S. Nat. Mus., No. 120468), about 0.4 x. E Lower surface of anterior part of head of same, 

 about 0.4 X. F Dermal denticles from below first dorsal fin of same, about 40 x. G Dermal denticles along 

 margin of saw of same, about 5 X • ^ Dermal denticles on upper lip (smaller) and upper teeth (larger) from 

 middle of jaw of same, about gX-J Tooth of same in lateral view, about 8 X ■ A' Cross section of upper lip and 

 anterior part of upper jaw of very young male from Para, Brazil (Harv. Mus. Comp. Zool., No. 302), to show 

 dermal denticles (smaller) and teeth (larger) in side view, about I2X. L Nostril of same, about 0.8 X. 



