First lesson in zoology : adapted for use in schools . ts. Not only do these singular quadrupeds in their structureresemble the reptiles, but, unlike other mammals, whoseeggs are of microscopic size, and which are born into theworld in a shape much like their parents, they lay eggs aslarge as those of some reptiles, and the young are born ina very rudimentary condition. Hence, we see that the low-liest mammals are connecting links between the reptilesand birds, on the one hand, and their more highly organ-ized brethren, of which we shall next speak. LiTBBATUBE.—Caldwells Embryology of Monotrem
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First lesson in zoology : adapted for use in schools . ts. Not only do these singular quadrupeds in their structureresemble the reptiles, but, unlike other mammals, whoseeggs are of microscopic size, and which are born into theworld in a shape much like their parents, they lay eggs aslarge as those of some reptiles, and the young are born ina very rudimentary condition. Hence, we see that the low-liest mammals are connecting links between the reptilesand birds, on the one hand, and their more highly organ-ized brethren, of which we shall next speak. LiTBBATUBE.—Caldwells Embryology of Monotremata and Marsiipialia. Phil. Trans. Roy. Soc, London, 1887. 234 FIRST LESSONS IN ZOOLOGY. CHAPTER XXXIII. THE MARSUPIALS OR POUCHED MAMMALS. Although the spiny ant-eater has a brood-pouch, thetrue pouched mammals are represented by the opossum(Fig. 235), kangaroo (Fig. 336), and a number of otherkinds, all of which, except the opossum, live in Aus-tralia. The pouch is supported by two long slenderbones (Fig. 335, M) attached to the front edge of the.