PROC. U.S. NAT. MUS. VOL. 119 



GILBERT^PLATE 7 



Radiographs of chondrocrania of several species of Sphyrna: A, S. liburo tiburo, 388 mm. 

 TL, from Nicaragua (USNM 78180; B, S. tiburo vespertma, 545 mm. TL, from Mexico 

 (UCLA 51^); C, S. media, 337 mm. TL, from Mexico (FMNH 63093); D, S. corona, 

 371 mm. TL, from Mexico (FMNH 72521, ex. 63093). 



