43 o Memoir Sears Foundation for Marine Research 



Interspace between: ist and 2nd dorsals 20.8 ; 2nd dorsal and caudal 7. i ; anal and 



caudal 6.8. 



Distance from origin to origin of: pectoral and pelvics 2 1 . i ; pelvics and anal 12.9. 



Figure 84. Sfhyrna tudes, new-born male, 673 mm. long, from Englewood, Florida (U. S. Nat. Mus., 

 No. 106543). A Anterior part of head from below, about 0.4 x natural size. B Dermal denticles, about 65 x. 



Two females, 1,745 and 3,155 mm., from Englewood, Florida (calculated from 

 measurements by Stewart Springer). 



Snout length in front of: mouth 5.4, 4.6. 



Eye: horizontal diameter 1.4, 0.9. 



Mouth: breadth S.6, 7.1; height 2.9, 4.3. 



Nostrils: distance between inner ends 16.3, 19.0. 



Gill opening lengths: ist 3.3, 4.0 j 5th 2.3, 2.8. 



First dorsal fin: length of base lO.o, lO.i. 



Second dorsal fin: length of base 4.9, 4.4. 



Anal fin: length of base 6.3, 6.0. 



Caudal fin: upper margin 31.0, 29.5; lower anterior margin 12.O, 11.7. 



Pectoral fin: outer margin 14.1, 15.85 inner margin 3.9, 3.85 distal margin 11.4, 



14.4. 



Distance from snout to: ist dorsal 27.8, 28.55 upper caudal 69.0, 70.5; pectoral 



20.6, 21.8. 



Interspace between: ist and 2nd dorsals 2 1 .7, 1 9.8 j 2nd dorsal and caudal 8.3, 7.6. 



