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The early fishes make but little show in a museum, both on account of their small size and the conditions under which they have been preserved. The Museum of Comparative Zoölogy has a large collection of these ancient vertebrates, and there is a considerable number of fine teeth and spines of Carboniferous sharks in the United States National Museum.

Hugh Miller's "The Old Red Sandstone" contains some charming descriptions of his discoveries of Pterichthys and related forms, and this book will ever remain a classic.

Fig. 5.—Pterichthys, the Wing Fish.