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- noun Plural form of
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As the rays and sharks both belong to the order of placoids, it appears that the shark is not particular about preying on his kindred.
We do not see a sturgeon (our British representative of the ganoids) once in a twelvemonth; and though the skate and dog-fish (our representatives of the placoids) are greatly less rare, their number bears but a small proportion to that of the fishes belonging to the two prevailing orders, of which thousands of boat-loads are landed on our coasts every day.
The earliest fishes -- firstborn of their family -- seem to have been all placoids.
The Port Jackson shark, however, -- a creature that to the dorsal spines and shagreen-covered skin of the common dog-fish adds a mouth terminal at the snout, not placed beneath, as in most other sharks, and a palate covered with a dense pavement of crushing teeth, -- better illustrates the order as it first appeared in creation than any of our British placoids.