SAW- FISHES. 



41 



Remains of 



opposite to the base of the pelvic fins, or nearly so 

 the genus Pristis are found in Eocene deposits. 



The Saw-fishes shown are Pristis cuspidatus, 100, in Wall- 

 «ase 3, Pristis pectinatus, 1137, hanging from the rail opposite 

 Wall-case 5, andja large Pristis perrotteti, 1120, hanging from the 



%, 



^ 



Fig. 21. — Lower view of head of Saw-fish. 



roof between Wall- cases 2 and 19. Rostral saws of Pristis 

 sagittatus, 99, and Pristis perrotteti, 98, are shown in Wall- 

 case 3, and saws of Pristis zysron, 1142, and Pristis antiquorum, 

 1143, on the wall between Wall-cases 2 and 3. Saw-fishes are 

 found in tropical and to a less extent in subtropical seas. They 

 attain to a considerable size, the c saws' of some species measuring 

 six feet in length. The saw is a powerful weapon of attack and 

 is used to rip up the body of some large fish or Whale ; the teeth 



