Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 DERMAL SKELETON. 31 appear much earlier in the developing animal than do definite ossifications within particular parts of the cartilaginous skeleton. The condition which obtains in Fishes and Amphibia well illustrates 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 y
Elements of the comparative anatomy Elements of the comparative anatomy of vertebrates elementsofcompar00wied Year: 1886 DERMAL SKELETON. 31 appear much earlier in the developing animal than do definite ossifications within particular parts of the cartilaginous skeleton. The condition which obtains in Fishes and Amphibia well illustrates 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.
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