PLATE 6. 



CARCHARIIDAE and ISURIDAE. i 



Fig. 1-3. C.\KCHARi.\s T.\uRus (Page 25). Fig. 4-6. Isu'rus punct,\tu.s (Page 36). 



1 . Lateral view of a specimen 42 inches long. ] 



2. Teeth from the front end of the jaw. ] 



3. Head from below. I 



4. Lateral view. 



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



0. Head from below. . 



