3IO 



Memoir Sears Foundation for Marine Research 

 Negaprion ifrevirostris (Poey), 1868 



Lemon Shark 



Figures 52, 53 



Study Material. Six specimens, male and female, 610 to 893 mm. (about 24 to 35 

 inches), from coasts of Texas, Louisiana and Florida (U.S. Nat. Mus. and Amer. Mus. 

 Nat. Hist.) ; also jaws of a 6-foot lO-inch female from Bay of Florida. 



Distinctive Characters. Made easily recognizable among western Atlantic Carcha- 

 rhinidae by a second dorsal that is nearly as large as the first, with a very broadly rounded 

 snout, and by its characteristic teeth. 



Description. Proportional dimensions in per cent of total length. Female, 610 mm., 



Figure 52. Negafrion irevirostris, immature male, 782 mm. long, from Florida (Amer. Mus. Nat. Hist.). 

 A Dennal denticles of same, about 26 x. B Apical view of dermal denticles, about 52 x. C Left-hand upper 

 and lower teeth of a 6-foot lo-inch female from the Bay of Florida (Amer. Mus. Nat. Hist., No. 5735), 

 about i.i X. Z) Fourth upper tooth. E Tenth upper tooth. F Second lower tooth. G Tenth lower tooth. 

 D-G, about 2.2 z. 



