. A manual of zoology. Zoology. Fig. 10^.—Unequal cleavage of the egg of Ptiroii:y:oii (after Shipley, from Hatschek). .4, stage of eight cleavage spheres; B, blastula in meridional section. The dissimilarity of the clea\'age splieres begins with the equatorial 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912