. Elements of zoölogy : a textbook. Zoology. PLAGIOSTOMI OE SELACHII: SHARKS. 259 Dog-fishes (Fig. 300) have the dorsal fins furnished with strong spines. Similar fossil spines, more than two feet in length, are found in the Devonian and Carboniferous rocks. The Cestraciont Sharks, around Australia, have the mouth furnished with a pavement of bony pieces, for a masticating apparatus; the margins of their jaws, how-. Thresher Shark, Alopias vulpes, Bon. FIG. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
. Elements of zoölogy : a textbook. Zoology. PLAGIOSTOMI OE SELACHII: SHARKS. 259 Dog-fishes (Fig. 300) have the dorsal fins furnished with strong spines. Similar fossil spines, more than two feet in length, are found in the Devonian and Carboniferous rocks. The Cestraciont Sharks, around Australia, have the mouth furnished with a pavement of bony pieces, for a masticating apparatus; the margins of their jaws, how-. Thresher Shark, Alopias vulpes, Bon. FIG. 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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