260 VERTEBRATA: PISCES OR FISHES. 



FIG. 304. 



QOSSE 



Hammerhead Shark, Zygcena malleus, Valenciennes ; and Saw-fish, Pristis antiquorum, 



Latham. 



According to Agassiz the parent and offspring in some 

 kinds of sharks is as intimate as in the higher mammals. 



FIG. 305. 



Shark's Egg, with a portion of the covering removed. 



