. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 120 ELEMENTS OF BIOLOGY Sub-class L prototheria (Fig. 72). Egg-laying mammals. No nipples for feeding the young. Two Australian forms, the Duckbill and the Echidna. Sub-class IL metatheria (Fig. 73). The Marsupials. The young are born in a very immature state and complete their development in a pouch or marsupium on the ventral body wall of the female. Ay£S. FIG. 71 BIRD Fig. 71,—A common bird, representative of the class Aves. Compare the beak and claws with those of a reptile (Fig. 70). For
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. 120 ELEMENTS OF BIOLOGY Sub-class L prototheria (Fig. 72). Egg-laying mammals. No nipples for feeding the young. Two Australian forms, the Duckbill and the Echidna. Sub-class IL metatheria (Fig. 73). The Marsupials. The young are born in a very immature state and complete their development in a pouch or marsupium on the ventral body wall of the female. Ay£S. FIG. 71 BIRD Fig. 71,—A common bird, representative of the class Aves. Compare the beak and claws with those of a reptile (Fig. 70). For the internal structure of a bird, see Fig. 212. The Marsupials include such forms as the Kangaroo and the Opossum. The Opossum is the only North American representa- tive of this group. Sub-class in. eutheria. All other Mammals except those de- scribed in the above two sub-classes. There are nine modern orders of Eutheria:. 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 Buchanan, James William, 1888-. New York, London, Harper & brothers
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