. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Sand shark, an elasmobranch. Note the slits leading from the gills. From photograph loaned by the American Museum of Natural History. 1. The Elasmobranchs. — These fishes have a skeleton formed of carti- lage which has not become hardened with lime. The gills communicate with the surface of the body by separate openings instead of having an operculum. The skin is rough and the eggs few in number. In some members of this group the young are born alive. Sharks, rays, and skates are Elasmobran
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Sand shark, an elasmobranch. Note the slits leading from the gills. From photograph loaned by the American Museum of Natural History. 1. The Elasmobranchs. — These fishes have a skeleton formed of carti- lage which has not become hardened with lime. The gills communicate with the surface of the body by separate openings instead of having an operculum. The skin is rough and the eggs few in number. In some members of this group the young are born alive. Sharks, rays, and skates are Sturgeon (Acipenser sturio), a ganoid fish. 2. Ganoids. — Fish in which the body is protected by a series of plate- like scales of considerable strength. These fishes are the only remnant of. 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 Hunter, George William, 1873-1948. New York, American book company
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