The evolution of man: a popular exposition of the principal points of human ontogeny and phylogenyFrom the German of Ernst Haeckel . terraneandwellings on the banks; this is the well-known Duck-billed Platypus {Ornithorhyndius jjaradoxus): it is web-footed, has a thick, soft skin, and broad, flat jaws, whichvery much resemble a ducks bill (Figs. 195, 196). Theother form, the Porcupine Ant-eater (Echidna hijstrix), muchresembles the Ant-eaters, in its mode of life, in the cha-racteristic form of its slender snout, and in the great lengthof its tongue; it is covered with prickles, and can roll i
The evolution of man: a popular exposition of the principal points of human ontogeny and phylogenyFrom the German of Ernst Haeckel . terraneandwellings on the banks; this is the well-known Duck-billed Platypus {Ornithorhyndius jjaradoxus): it is web-footed, has a thick, soft skin, and broad, flat jaws, whichvery much resemble a ducks bill (Figs. 195, 196). Theother form, the Porcupine Ant-eater (Echidna hijstrix), muchresembles the Ant-eaters, in its mode of life, in the cha-racteristic form of its slender snout, and in the great lengthof its tongue; it is covered with prickles, and can roll itselfuj) into a ball like a hedgehog. Neither of these extantBeaked Animals possesses true bony teeth, and, in thispoint, they resemble the Toothless Mammals (Edentata).The absence of teeth, together with other peculiarities ofthe Ornithostomata, is probably the result of comparativelyrecent adaptation. Those extinct Cloacal Animas whichembraced the parent-forms of the whole Mammalian class,the Promammalia, must certainly have been provided witha developed set of teeth, inherited from ^^^ Some 148 THE EVOLUTIOX OF Fig. 195.—The Duck-billed Platy-pus (Ornithorhynchus paradoxus).Fig. 196.—Skeleton of Platypus.
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Keywords: ., bookcentury1800, booksubjectembryology, booksubjectembryologyhum
