. The Cambridge natural history. Zoology. FOSSIL ASTEROIDEA 475 remarkable family, chiefly on account of the smallness of the disc and of the extraordinary length of the arms. The arms have what we must consider to have been the primitive arrange- ment, since there is no lateral adhesion between them, and inter-. FlG. 205.—Aboral viewof Odima. x|. (After Perrier.) brachial septa are consequently entirely absent. The reduction of the skeleton is a very marked peculiarity and, like the ten- dency to the reduction of the skeleton of deep-sea fish, may stand in some relation to the great pressure
. The Cambridge natural history. Zoology. FOSSIL ASTEROIDEA 475 remarkable family, chiefly on account of the smallness of the disc and of the extraordinary length of the arms. The arms have what we must consider to have been the primitive arrange- ment, since there is no lateral adhesion between them, and inter-. FlG. 205.—Aboral viewof Odima. x|. (After Perrier.) brachial septa are consequently entirely absent. The reduction of the skeleton is a very marked peculiarity and, like the ten- dency to the reduction of the skeleton of deep-sea fish, may stand in some relation to the great pressure under which the animals live. Fossil Asteroidea. The Asteroidea occur somewhat plentifully as fossils. In the Lower Jurassic Asterias, Asfropecten, Luidia, Solasfer, and Goni- aster have already made their appearance. In the Cretaceous. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
