Bulletin of the Museum of Comparative Zoology at Harvard College . ION OF FIGURES. All the figures were drawn from sections with the aid of an Abbe camera. Thesections from which the figures were made were 5 fi in thickness. :.diTU. — Gastrulation in Aurelia. PLATE I. ABBREVIATIONS. blpo. Blastopore. cau. sg. Segmentation cavity. cl. Immigrated cell. cedent. Coelenteron. cog. Coagulum. ecdrm. Ectoderm. endrin. Entoderm. nl. Chromatic portion of degenerated nucleus. nl. ecdnn. Nuclei of deeper portion of ectoderm. Figures 1-4. Sections to illustrate the nature of the 1. An ear
Bulletin of the Museum of Comparative Zoology at Harvard College . ION OF FIGURES. All the figures were drawn from sections with the aid of an Abbe camera. Thesections from which the figures were made were 5 fi in thickness. :.diTU. — Gastrulation in Aurelia. PLATE I. ABBREVIATIONS. blpo. Blastopore. cau. sg. Segmentation cavity. cl. Immigrated cell. cedent. Coelenteron. cog. Coagulum. ecdrm. Ectoderm. endrin. Entoderm. nl. Chromatic portion of degenerated nucleus. nl. ecdnn. Nuclei of deeper portion of ectoderm. Figures 1-4. Sections to illustrate the nature of the 1. An early stage of invagination, x 460. 2. A slightly later stage tlian that of Figure 1. X 540. 3. A stage in whicli the invagination is well advanced. X .385. 4. A gastrula with invagination completed. X 410. 5. Section of a gastrula cut in a plane (equator) perpendicular to the axis of the hlastoporic canal. X .385. 6. Section of an older individual through the equator, showing increase inthickness of the entoderm, x 385. Smith- GASTRUij\TrON in AurelL\. hlpo
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Keywords: ., bookcentury1800, bookdecade1860, bookidbullet, booksubjectzoology
