Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 FIG. 18.—DERMAL DENTICLES OF Protoptents. D, the _ apical portion of the denticle.; S, S, the base of the denticle, the cavity of which is seen in optical section through the transparent apical portion at and this. To take a single example : the young File-fish (Balistes) is provided with a complete dermal armour at the time when the ossification of the primordial cranium has hardly begun. FIG. 19.—DERMAL ARMATURE OF Callichtliys. B, barbules ; BrF, pectoral fin
Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 FIG. 18.—DERMAL DENTICLES OF Protoptents. D, the _ apical portion of the denticle.; S, S, the base of the denticle, the cavity of which is seen in optical section through the transparent apical portion at and this. To take a single example : the young File-fish (Balistes) is provided with a complete dermal armour at the time when the ossification of the primordial cranium has hardly begun. FIG. 19.—DERMAL ARMATURE OF Callichtliys. B, barbules ; BrF, pectoral fin ; BF, pelvic fin ; RF, dorsal fin ; DS and VS, dorsal and ventral bony shields ; f, lateral line. / The exoskeleton originates by the formation of small denticles (Figs. 17 and 18) attached to basal plates, which lie scattered over
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