PLATE 6. 



CARCHARIIDAE and ISURIDAE. 



Fig. 1-3. Carcharias taurus (Page 25). Fig. 4-6. Isurus punctatus (Pago 36). 



1. Lateral view of a specimen 42 inches long. 



2. Teeth from the front end of the jaw. 



3. Head from below. 



4. Lateral view. 



5. Teeth from near the front end of the jaw. 



6. Head from below. 



