FOSSIL CHIM.EROIDS. 



137 



Figs. I 16-120. — Association of dental plates of early Chimaeroids. 



I 16, PlyctcxJus, restored dentition, after specimens in Museum of Comparative Zoology. Cambridge. Mass. 



I 17, Palaeomylus, after specimens in Newberry collection, American Museum of Natural History. 



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



I 19. Myriacanlhus. 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. 

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



