SHARK-LIKE DERMAL DENTICLES. 



E 



Figs. 93 A-F. Dermal denticles of Callorhynchus. 



Thedonal 



A. Dorsal aspect of young Callorhynchus "antarcticus" (Chili), measuring 16 on. in length. 



denticles are conspicuous ; their disposition and number is indicated. 



B. Dorsal aspect of well-grown Callorhynchus "antarcticus" (Chili), 'measuring 50 cm. in length. The 



dorsal denticles are reduced. In a specimen (Australian) measuring 92 cm. they do not appear. 



C. Isolated denticle from the back of a late "embryo." X 42. After Schauinsland. 



D. Isolated denticle of a late "embryo" (shown from side). X 42. After Schauinsland. 



E. Row of four denticles from the back (in front of second dorsal fin) of a late "embryo." After Schauinsland. 



F. Enlarged denticle from similar situation in " adult " specimen. ' 21. After Schauinsland. 



