"Placoid" Quotes from Famous Books
 ... 'Vertebrata', the same law holds good: certain types, such as those of the ganoid and placoid fishes, having persisted from the palaeozoic epoch to the present time without a greater amount of deviation from the normal standard than that which is seen within the limits of the group as it now exists. Even among the 'Reptilia'—the ...
— Lectures and Essays • T.H. Huxley |
