. The chordates. Chordata. Pre. 16. Types of teeth. (A) Pleurodont. (B) Acrodout. (C) Thecodont with open root. (Dj Thecodont with closed root. (Courtesy, Wilder: "History of the Human Body," New York, Henry Holt & Co., Inc.). ESOPHAGEAL VILLUS Fig. 47. The pharynx of an elasrnobranch (Squalus) laid open to show the double row of teeth in both upper and lower jaws. Such teeth differ only in size from the placoid scales of the pharynx and skin. Elasrnobranch teeth, like scales, are fastened in the skin and are not attached to the jaw cartilages. (After Cook. Courtesy, Neal and Ban
. The chordates. Chordata. Pre. 16. Types of teeth. (A) Pleurodont. (B) Acrodout. (C) Thecodont with open root. (Dj Thecodont with closed root. (Courtesy, Wilder: "History of the Human Body," New York, Henry Holt & Co., Inc.). ESOPHAGEAL VILLUS Fig. 47. The pharynx of an elasrnobranch (Squalus) laid open to show the double row of teeth in both upper and lower jaws. Such teeth differ only in size from the placoid scales of the pharynx and skin. Elasrnobranch teeth, like scales, are fastened in the skin and are not attached to the jaw cartilages. (After Cook. Courtesy, Neal and Band: "Chordate Anatomy," Philadelphia, The Blakiston Company.). 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 Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : Blakiston
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