Sea Urchin Ovum

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“Ovum of a Sea-Urchin, showing the radially striated cell-membrane, the protoplasm, containing yolk-granules, the large nucleus (germinal vescicle), with its network of chromatin and a large nucleolus (germinal spot).” -Parker, 1900


Parker, T. Jeffrey A Manual of Zoology (New York, NY: The MacMillan Company, 1900)


TIFF (full resolution)

2400×2370, 699.6 KiB

Large GIF

1024×1011, 148.0 KiB

Medium GIF

640×632, 81.0 KiB

Small GIF

320×316, 32.7 KiB