Entosiphon ovatus Stokes,1885. Body ovate, somewhat depressed, a little less than twice as long as wide, rounded posteriorly, narrowed anteriorly, and slightly curved toward the ventral aspect, the frontal border somewhat emarginated on the left side, the cuticular surface traversed by ten or twelve longitudinal sulci, the two flagella inserted near together on the left side of the ingestion organelle, the posterior or trailing appendage about twice as long as the body, the anterior or vibratile not exceeding the body in length, ingestion organelle protrusible, extending backwards for fully four-fifths of the entire length of the body, contractile vacuole single, near the left border of the frontal margin, nucleus spherical, near the centre of the left border. Reproduction by longitudinal fission. Length of body 25-28 microns Probably the same as E. sulcatum.
