. Darwin, and after Darwin. An exposition of the Darwinian theory and a discussion of post-Darwinian questions. Evolution; Heredity. Fig. 44.—Prophysema primordiale, an extant gastrsea-form. (After Hackel.) (Aj. External view of the whole animal, attached by its foot to seaweed. (B). Longitudinal section of the same. The digestive cavity {d) opens at its upper end in the mouth (w). Among the cells of the endoderm i^g) lie amoiboid egg-cells of large size {e). The ec- toderm {h) is encrusted with grains of sand, above the sponge spicules. such as is presented by the adult condition of many of t

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. Darwin, and after Darwin. An exposition of the Darwinian theory and a discussion of post-Darwinian questions. Evolution; Heredity. Fig. 44.—Prophysema primordiale, an extant gastrsea-form. (After Hackel.) (Aj. External view of the whole animal, attached by its foot to seaweed. (B). Longitudinal section of the same. The digestive cavity {d) opens at its upper end in the mouth (w). Among the cells of the endoderm i^g) lie amoiboid egg-cells of large size {e). The ec- toderm {h) is encrusted with grains of sand, above the sponge spicules. such as is presented by the adult condition of many of the most primitive Metazoa—especially the lower CceloUerata. The preceding figures represent two. 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 Romanes, George John, 1848-1894. Chicago The Open Court Pub. Co

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