. A manual of zoology. Zoology. IV. VERTEBRATA: MAAIMALIA, UNGULATA 567 The ungulates, which arise from the Condylarthra of the eocene (Phcna- codon), are preeminently herljivorous; the canines are rarely well developed, the molars numerous and adapted to grinding the food, more or less flattened and frequently with folded enamel. The mamma; are inguinal, the uterus bicornu- ate, and the placenta either diffuse or (most ruminants) cotyledonary (fig. 6io). The legs are exclusively locomotor structures and the clavicles are absent. Since the metacarpals and metatarsals are greatly elongate, the
. A manual of zoology. Zoology. IV. VERTEBRATA: MAAIMALIA, UNGULATA 567 The ungulates, which arise from the Condylarthra of the eocene (Phcna- codon), are preeminently herljivorous; the canines are rarely well developed, the molars numerous and adapted to grinding the food, more or less flattened and frequently with folded enamel. The mamma; are inguinal, the uterus bicornu- ate, and the placenta either diffuse or (most ruminants) cotyledonary (fig. 6io). The legs are exclusively locomotor structures and the clavicles are absent. Since the metacarpals and metatarsals are greatly elongate, the wrist and ankle are raised from the ground so that they are frequently confounded with elbow and knee. With this supporting character of the limbs there is a tendency to reduction and fusion of bones. There is a constant increase in the development of radius and tibia to the chief supports of the body, the fibula becoming rudimentary, the ulna being developed sometimes throughout its whole extent, sometimes only in its upper part, and is more or less fused with the radius. The same tendency to simplification prevails in the feet, but is ex-. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
