682 



MAMMALIA 



[CH. 



The whalebone Whales, Mystacoceti, have no teeth. The 

 orbital plate of the frontal is uncovered and there is a small 

 ethmoturbinal covered with olfactory epithelium. They are all 

 large animals, although they feed on the smallest prey, such as 

 minute pelagic mollusca, jelly-fish and Crustacea. The "whale- 



18 



FIG. 341. A. lateral view, and B. longitudinal section of the skull of a young 

 Ca'ing Whale, Globicephalus melas x . 



accipital. 4. Basisphenoid. 

 Interparietal fused with 3. 

 Frontal. 11. Mesethmoid. 

 Squamosal. 15. Jugal. 



Pterygoid. 19. Nasal. 



Mandible. 23. Anterior 



bone " or baleen consists of a large number of horny plates hanging 

 down like curtains from the palate into the cavity of the mouth. 

 These are placed in pairs, one on each side of the mouth, one pair 

 behind the other, and the fellows of a pair nearly meet in the middle. 

 The lower edges of these plates are frayed out so as to form a fringe 



