. Carnegie Institution of Washington publication. . an. FIG. 10.—"Pro-Cypris" larva of Thompsonia from Thalamita in egg-membrane. X375. FIG. 11.—Cypris larva of Thompsonia from Synalpheus. The dotted area in the ventral part of the body contains reserve materials, an., antenna. X470. within the egg membrane. While, moreover, the egg of Sacculina is comparatively large, 600 to 800 fj. in diameter, that of Thompsonia measures only about 34 //. Segmentation commences unequally, a micromere and a macromere with all the yolk being formed. Both micromere and macromere take part in the seco
. Carnegie Institution of Washington publication. . an. FIG. 10.—"Pro-Cypris" larva of Thompsonia from Thalamita in egg-membrane. X375. FIG. 11.—Cypris larva of Thompsonia from Synalpheus. The dotted area in the ventral part of the body contains reserve materials, an., antenna. X470. within the egg membrane. While, moreover, the egg of Sacculina is comparatively large, 600 to 800 fj. in diameter, that of Thompsonia measures only about 34 //. Segmentation commences unequally, a micromere and a macromere with all the yolk being formed. Both micromere and macromere take part in the second (text-figure 9c) and probably also in the third division, but after this the yolk-containing cells cease to divide. The continued division of those without yolk leads to their rapid extension over the yolked cells and gastrulation (text-figure 9 D, E, F) thus takes place by epibole. Beyond the gastrula I have not been able to trace development. The next stage observed is comparatively far advanced, showing a single pair of rudimentary processes, probably representing the antennae. I. 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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