Bulletin of the Museum of Comparative Zoology at Harvard College . mfir, ^^ .-•f, del. Bleise !rth Boston Smith. — Gastrulation in Aurelia. PLATE 11. ABBREVIATIONS. blpo. Blastopore. cav. sg. Segmentation cavity. cl. Immigrated cell. cedent. Ccelenteron. cog. Coagulum. ecdrm. Ectoderm. endrm. Entoderm. nl. Chromatic portion of degenerated nucleus. nl. ecdrm. Nuclei of deeper portion of ectoderm. Figures 7, 9, and 10 are from different sections of the same 7. Section through the blastoporic canal and nearly perpendicular to 8. Section at a stage preceding invaginat
Bulletin of the Museum of Comparative Zoology at Harvard College . mfir, ^^ .-•f, del. Bleise !rth Boston Smith. — Gastrulation in Aurelia. PLATE 11. ABBREVIATIONS. blpo. Blastopore. cav. sg. Segmentation cavity. cl. Immigrated cell. cedent. Ccelenteron. cog. Coagulum. ecdrm. Ectoderm. endrm. Entoderm. nl. Chromatic portion of degenerated nucleus. nl. ecdrm. Nuclei of deeper portion of ectoderm. Figures 7, 9, and 10 are from different sections of the same 7. Section through the blastoporic canal and nearly perpendicular to 8. Section at a stage preceding invagination. It shows an immigrated cellin which the nucleus has degenerated. X 385. 9. Section before the close of gastrulation, showing an immigrated cell inthe segmentation cavity. X 410. 10. Section from the same individual as Figure 9. It contains an immigratedcell in the coelenteric cavity. X 410. 11. Section of agastrula with two immigrated cells contained in the coelen-teric cavity. X 385. 12. Section from the same individual as Figure 3, to show the appeara
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