. Biology. Biology. — mh FIG. 66.—Diagrammatic figures of the early and embryonic stages in develop- ment of the earthworm. A-F, gastrulation showing the formation of the two layers ectoderm and endoderm, and the beginning of the mesoderm arising at the outset from the cells shown at m; the lower five figures show the origin of the coelomic chambers and the dissepiments, al, alimentary tract; an, anus; ar, archenteron; c&, coelom; ec, ectoderm; en, endoderm; mt mesoblast pole-cell; mz, mesoblast tissue; mh, mouth; n, nerve cord; sc, segmentation cavity; sm, somatic mesoderm; ,
. Biology. Biology. — mh FIG. 66.—Diagrammatic figures of the early and embryonic stages in develop- ment of the earthworm. A-F, gastrulation showing the formation of the two layers ectoderm and endoderm, and the beginning of the mesoderm arising at the outset from the cells shown at m; the lower five figures show the origin of the coelomic chambers and the dissepiments, al, alimentary tract; an, anus; ar, archenteron; c&, coelom; ec, ectoderm; en, endoderm; mt mesoblast pole-cell; mz, mesoblast tissue; mh, mouth; n, nerve cord; sc, segmentation cavity; sm, somatic mesoderm; , splanchnic mesoderm; 8, eighth coelomic cavity. (From Sedgwick and Wilson.). 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 Calkins, Gary N. (Gary Nathan), b. 1869. New York, H. Holt and company
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