FOSSIL CHIM^EROIDS. 



137 



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



I 16, Ptyctodus, restored dentition, after specimens in Museum ol Comparative Zoology, Cambridge, Mats. 



117, Paleeomylus, after specimens in Newberry collection, American Museum of Natural History. 



I 1 8, Rhynchodus, after specimen in Newberry collection, American Museum of Natural History. 



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



pairs of plates in the upper jaw are shown in detail in fig. 119 A. 

 1 20, Squaloraja, after specimens in the British Museum, and in the Museum of Comparative Zoology, Cambridge, Mass. 



