Fresh-Water Rhizopods of North America: Plate 21
This is Plate 21 in "Fresh-Water Rhizopods of North America." All of the figures belong to one species, Hyalospheim papilio. This rhizopod grows its own test ("shell"). The green objects within the organism are green or blue-green algae that it has ingested.
Three other lithographic plates from "Fresh-Water Rhizopods of North America" (1897) are also available: