PLATE 







FlG. 5. Kmbryo of Neoineris, showing dorsal dermal plates. 

 (From Kiikenlhal.) 



FIG. 6. Portion of dorsal fin of Porpoise, showing dermal ossicles. 



(From Kiikenlhal.) 



FIG. 7. Portion of skin of Neomeris, showing dermal ossicles. 



(From Kiikenthal.) 



{To face page 32. 



