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“Life history of Gregarina. 1. Young forms (a, b, c) emerging from intestinal cells (i.c.); i.n., nucleus of intestinal cell. 2. Two forms conjugating (G. blattarum). 3. Spore formation within a cyst. 4. Adult with deciduous head-cap (c.c.), and a cuticular partition dividing the cell into an anterior part (A) and a posterior part (B); n., the nucleus. 5. A spore within its spore-case (sp.c.).” -Thomson, 1916


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


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