Even to-day, perhaps, a chlorophyl-bearing Infusorian such as the euglena may symbolize this primordial tendency of life, though in a mean form, incapable of evolving.
"Creative Evolution"
Henri Bergson
Indeed, although it has not yet been found possible to work out this life-history in detail, I have been able to obtain much evidence that they are the resting stage of a flagellate organism allied to euglena which is swallowed by the polyzoon and becomes encysted in its gizzard, extruding in so doing from its external surface a large proportion of the food-material that it has stored up within itself in the form of transparent granules.
"Freshwater Sponges, Hydroids & Polyzoa"
Nelson Annandale
The book on microscopic fresh-water fauna had been explicit about Paramecium and euglena, diatomes and rhizopods, but it had failed to mention anything so vulgar as germs.
"The Rotifers"
Robert Abernathy