. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. THE SPIRAL TYPE OF CLEAVAGE. 247. Fig. 15. — Arenicola. matic plate, showing position of para- troch when first formed, x x, the first cells which meet in the median line during 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 Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co

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Keywords: ., bookcentury1800, bookdecade1890, bookpublishe, booksubjectbiology