. The bird, its form and function. Birds. 90 The Bird. Fig. 63—Pelvic arch of a Dinosaur bone extending backward from the thigh-socket, sepa- rated from the ischium (except at the extreme end) by a long open sht. In other animals these bones are as different in shape as can be imagined, but, almost without excep- tion, the position of each is relativeh' the same. The extreme extension, forward and back, of the ilium above the back-bone, thus joining with more vertebrse, is directh' connected with two-legged erect locomo- tion. A parallel condition is found in some Diitosmirs —those extinct gia
. The bird, its form and function. Birds. 90 The Bird. Fig. 63—Pelvic arch of a Dinosaur bone extending backward from the thigh-socket, sepa- rated from the ischium (except at the extreme end) by a long open sht. In other animals these bones are as different in shape as can be imagined, but, almost without excep- tion, the position of each is relativeh' the same. The extreme extension, forward and back, of the ilium above the back-bone, thus joining with more vertebrse, is directh' connected with two-legged erect locomo- tion. A parallel condition is found in some Diitosmirs —those extinct giant rep- tiles — certain of which walked more or less on their hind legs. Another fundamental resemblance is found be- tween the thigh-girdles of Dinosaurs and other rep- tiles and that of a bird in the egg. As is shown in Figs. 63-65, the pubis slants slightly forward in both reptile and embryo bird; but in. 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 Beebe, William, 1877-1962. New York, Holt
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbirds, bookyear1906
