Peranema trichophorum is a colorless, metabolic euglenoid with a single large flagellum, only the tip of which is employed in forward locomotion. The flagellum arises from a blepharoplast in the wall of the flask-shaped gullet and leaves the body through the cytostome. The pharyngeal-rod apparatus ("staborgan") consists typically of two pharyngeal-rods and a curved cytostomal element. The rods extend from the rim of the cytostome posteriorly along the gullet. The cytostomal element lies along one "lip" of the cytostome and extends partly around the gullet to join the pharyngeal-rods. The apparatus probably operates in expansion of cytostome and gullet in feeding, although this could not be determined in living material with any degree of accuracy. In mitosis longitudinal splitting of the chromosomes occurs, followed by unipolar separation of the daughter chromosomes. This results in the appearance of V-shaped daughter chromosome pairs, which unfold to form the chromosome belt of the later prophases. Final separation of the daughter chromosomes (at the "apex" of each V) occurs in the metaphase. This process is similar to that described in Menoidium incurvum (Hall, 1923) and Euglena agilis (Baker, 1926). The kinetic elements consist of a blepharoplast, in which the flagellum ends, a centrosome on the nuclear membrane, and a rhizoplast joining blepharoplast and centrosome. The blepharoplast-rhizoplast-centrosome complex was detected in early prophases, but not in interkinetic stages. In later prophases both centrosome and blepharoplast apparently divide, and the daughter centrosomes gradually move apart toward opposite poles of the nucleus. A second flagellum grows out from one of the daughter blepharoplasts. There is no evidence for nuclear origin of centrosome or blepharoplast in Peranema trichophorum. The question of the nuclear origin of centrosome and blepharoplast in flagellates is discussed, with special referenence to the papers of Kater and Baker. It is pointed out that neither paper contains sufficient evidence to prove a nuclear origin of kinetic elements.