OF THE UNITED STATES 383 



that ever plowed the ocean, and devour the carcass afterward, 

 piecemeal ; they are also very destructive of the seals about the 

 islands inhabited by those valuable animals, and according to 

 Professor Goode, Eschricht says that thirteen porpoises and four- 

 teen seals were found in the stomach of an Atlantic Killer, six- 

 teen feet in length. 



The Blackfishes (Fig. 95) are a medium-sized whale that range 

 over their oceanic habitat in schools sometimes numbering sev- 

 eral hundreds; they are not especially valuable to the whalers, 

 but are mercilessly preyed upon by the Killer whales. 



Earer than the last-mentioned species, though often associated 

 with them, are the Grampuses (Fig. 96), a smaller whale than they 

 though with very similar habits, and we are told that they make 

 their appearance in our waters only about once in ten years. 

 Professor Flower has proved beyond all manner of doubt that the 



FIG. 96. THE GKAMPUS (Grampus griseus). 



By the Author, after Elliott. Length of adult, 20 feet. 



fantastic markings on the body of this animal are normal and are 

 not due to scars from conflicts with their fellows or other species. 

 A fine cast of a Grampus may be seen and studied at the Smith- 

 sonian Institution, where it used to surmount the doorway of the 

 main entrance, down-stairs. 



One of the most interesting of all Cetaceans is the Narwhal 

 (Fig. 100), an animal which stands responsible for the Unicorn of 

 fancy, and which is now restricted in its range to the northern 

 shores of our Alaskan territories. The spiral tusk growing from 

 the left side of its upper jaw is a modified tooth which may at- 

 tain a length of eight or ten feet. It is absent in the female, 

 the sex being practically toothless, or at least the teeth are con- 

 cealed in the jaw as is the case on the right side in the male Nar- 

 whal. This tusk is without enamel, and a single one is valued 

 at |50, the ivory being put to a variety of purposes. Occasion- 

 ally both tusks are developed, in which case the spirals each 



