. Zoology : for students and general readers . Zoology. 430 ZOOLOGY. or Isuriis pundatus (Fig. 389). The head is conical, with the nostrils under the base, and the lobes of the tail are nearly equal. It is from four to eight feet in length, and is often taken in fish-nets, being a surface-swimmer. In the thresher shark {Alopecias vulpes CuTier), the upper lobe of the tail is nearly as long as the body of the shark itself. It grows twelve or fifteen feet in length, and lives on the high seas of the Atlantic. Nearly twice the size of the thresher is the great basking shark, Selache (Cetorhinus)
. Zoology : for students and general readers . Zoology. 430 ZOOLOGY. or Isuriis pundatus (Fig. 389). The head is conical, with the nostrils under the base, and the lobes of the tail are nearly equal. It is from four to eight feet in length, and is often taken in fish-nets, being a surface-swimmer. In the thresher shark {Alopecias vulpes CuTier), the upper lobe of the tail is nearly as long as the body of the shark itself. It grows twelve or fifteen feet in length, and lives on the high seas of the Atlantic. Nearly twice the size of the thresher is the great basking shark, Selache (Cetorhinus) maxima Cuvier, of the North Atlantic, which becomes nine to thirteen metres (thirty or forty feet) in length. It has very large gill-slits, and is by no means as ferocious as most sharks, since it lives on small. Fig. 389.—Mackerel Shark.—From Teaney's "Zoology.'' fishes, and in part, probably, on small floating animals, strain- ing them into its throat through a series of rays or fringes of an elastic, hard substance, but brittle when bent too much, and arranged like a comb along the gill-openings, the teeth being very small. Among the smaller sharks is the dog-fish {Squalus Ameri- canus Storer), distinguished by the sharjD spine in front of each of the two dorsal fins. It is caught in great numbers for the oil which is extracted from its liver. The dog-shark (Mustelus canis Dekay), which is a little larger than the dog-fish, becoming over a metre (four feet) long, brings forth its young alive. In the European Mustelus Icevis Risso a so-called placenta is developed, while it is wanting in the Mustelus vulgaris of Miiller and 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879
