Fishes of the Western North Atlantic 



421 



and tudes by the evenly rounded anterior outline of its head, and further from tudes by its 

 smooth-edged teeth. 



Description. Proportional dimensions in per cent of total length. Female, 621 mm., 

 from Galveston, Texas (Harv. Mus. Comp. Zool., No. 36157). Male, 812 mm., from 

 Tortugas, Florida (Harv. Mus. Comp. Zool., No. 848). 



Trunk at origin of pectoral: breadth 8.7, 8.9; height lO.O, 8.4. 



Snout length in front of: outer nostrils 4.0, 4.1 5 mouth 8.0, 6.6. 



Eye: horizontal diameter 1.8, 1.5. 



Mouth: breadth 7.2, 6.O5 height 3.8, 3.5. 



Nostrils: distance between inner ends 12.2, 9.9. 



Labial furrow length: lower 0.7, 0.5. 



Gill opening lengths: ist 2.7, 2.2; 2nd 3.2, 2.5; 3rd 3.5, 2.6; 4th 3.2, 2.5; 5th 



2.8,2.1. 



First dorsal fin: vertical height 1 1.6, 1 1.4; length of base 9.6, 9.2. 



Second dorsal fin: vertical height 4.2, 3.9 ; length of base $-5^ 5-2. 



Anal fin: vertical height 3.5, 3.4; length of base 7.6, 6.7. 



Caudal fin: upper margin 26.7, 25.7; lower anterior margin lO.i, lO.i. 



Pectoral fin: outer margin 13.8, 15.O; inner margin 5.8, 5.8; distal margin 11. 6, 



12.7. 



Figure 82. Sfhyrna tiburo. A Female, 367 mm. long, from Rio de Janeiro, Brazil (Harv. Mus. Comp. 

 Zool., No. go). B Head of same, from below. C Dermal denticles of same, about 18 x. Z) Lateral and apical 

 views of dermal denticle, about 36 x. £ Left-hand upper and lower teeth of male, 812 mm. long, from 

 Tortugas, Florida (Harv. Mus. Comp. Zool., No. 848), about 2 x. F Fourth upper tooth. G Tenth upper 

 tooth. H Second lower tooth. / Seventh lower tooth. J Tenth lower tooth. F-J, about 4 x. 



