Euglena viridis is a species of unicellular protists in the Euglenaceae family of flagellate organisms.
"A, Euglena viridis, a flagellate Infusorian. I, typical swimming condition; 2, somewhat contracted;…
"Euglena viridis. A-D, four views illustrating euglenoid movements; E and H, enlarged views; F, anterior…
"Diagrams of Foraminifera. A, monothalamian; B, C, polythalamian; D, horizontal, and E, F, vertical…
"Paramoecium. ad. Adult form, showing cilia, "mouth," contractile vacuoles, etc. div. Transverse division.…