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



GILBERT— PLATE 6 



Radiographs of chondrocrania of several species of Sphyrna: A, S. mokarran, 560 mm. TL, 

 from Florida (USNM 186087); B, S. lewini, 447 mm. TL, from Liberia (USNM 179706); 

 C, S. zygaena, 590 mm. TL, from Italy (USNM 28452). 



