. Elements of zoölogy : a textbook. Zoology. Dog-fish, Acanthias americanus, Storer. ' Fio. Mackerel Shark, Lamna punctata, Storer. The Sharks present considerable diversity of form (Figs. 300-304). The Hammerheads (Fig. 304) have the head shaped like a double-headed hammer. The Spined. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tenney, Sanborn, 1827-1877. New York : Scribner

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