. Zoology. Zoology. 16 Fig. 13.—«, lonfritudinal section through a simple calcareous sponge, showing its simple central cavity; b, showing a single osculum at the top, and the many mouths over the surface. After 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 Packard, A. S. (Alpheus Spring), 1839-1905. N. Y. , Holt

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1897