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“A colonial flagellate Infusorian--Proterospongia haeckelii. There are about 40 flagellate individuals. a, nucleus; b, contractile vacuole; c, amoeboid unit in gelatinous matrix; d, division of an amoeboid unit; e, flagellate units with collars contracted; f, hyaline outer membranes; g, unit forming spores.” -Thomson, 1916


J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)


TIFF (full resolution)

2400×1933, 972.8 KiB

Large GIF

1024×824, 178.2 KiB

Medium GIF

640×515, 94.5 KiB

Small GIF

320×257, 32.0 KiB