. Carnegie Institution of Washington publication. 12 Hyhridizatioii of EcJiinoids. classes of Echinoderms. To the list given in the paper cited should be added Mortensen's contributions on Crinoids and that of Oshima (1918, 1921) on the Holothurian Cucumaria echinata, in which the mesenchyme cells are described as migrating into the blastocoele before the beginning of Fig. 5a, Skeletal rods from fixed and mounted Cidnris larva. 6 days. X 350. 56, Cidaris larva, 2 weeks old, fixed and mounted. Camera sketch. X 110. 5c, Camera sketch of living Cidaris 9 X Lytechinusc^ gastrula. 24
. Carnegie Institution of Washington publication. 12 Hyhridizatioii of EcJiinoids. classes of Echinoderms. To the list given in the paper cited should be added Mortensen's contributions on Crinoids and that of Oshima (1918, 1921) on the Holothurian Cucumaria echinata, in which the mesenchyme cells are described as migrating into the blastocoele before the beginning of Fig. 5a, Skeletal rods from fixed and mounted Cidnris larva. 6 days. X 350. 56, Cidaris larva, 2 weeks old, fixed and mounted. Camera sketch. X 110. 5c, Camera sketch of living Cidaris 9 X Lytechinusc^ gastrula. 24 hours. X 220. 5d, Camera sketch of living Cidaris 9 X LTjlechinus d^ gastrula. 24 hours. X 220. 5e, Camera sketch of living Cidaris 9 X Lytechinus cf gastrula. 40 hours. X 220. Mortensen's (1920) studies have shown that there is diversity in the manner of formation of mesenchyme in the Crinoids, a fact which our knowledge of the development of three species of Antedon had failed to reveal. These observations do not affect the conclusions that I have drawn regarding the primitive nature of the development of Cidaris. Cidaris tribuloides, in the estimation of those qualified to speak on the systematic position of echinoids, is primitive. This fact suggests. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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