SHARK-LIKE DERMAL DENTICLES. 



115 



D 



E 



w 



1 IcDgth. The dorsal 



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



A. Dorsal aspect of young Callorhynchus "antarcticus" (Chili), measuring 16 cm. i 

 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 (Austr;ilian) measuring 92 cm. they do not appear. 



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



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



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



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



