FOSSIL CHIM^ROIDS. 



137 



Figs. 1 16-120. Association of denial plates of early Chimaeroids. 



I 16, Ptyctodus, restored dentition, after specimens ; n Museum of Comparative Zoolosy. Cambridge, Man. 



117, PaUcomylus. after specimen) in Newberry collection, American Museum of Natural History. 



1 18, Rhynchodus, after specimen in Newberry collection, American Museum of Natural History. 



I 19, Myriacanthus, after specimens in the British Museum, and in the Jerrnyn Street collection ; the tritoral areas of the two anterior 



pairs of plates in the upper jaw are shown in detail in fig. I 19 A. 

 120, Squaloraja, after specimens in the British Museum, and in the Museum of Comparative Zoology, Cambridge, Mass. 



