Sagittal sections of mature animals, anterior to the left, dorsal up. (?B) Stained after Richardson et al. (1960). (C) Stained after Heidenhain (Romeis, 1968). Red arrow marks the opening of the bursa to the digestive syncytium. (D) Schematic drawing, based on sections of several individuals. at atrium, bc bursal cap, co copulatory apparatus, cv chordoid vacuole, de developing egg, ds digestive syncytium, ep ciliated epidermis, fg frontal glands, mo male genital opening, mt mouth, pe penis, pg prostatic glands, ps penis sheath, pv prostatic vesicle, sb seminal bursa, sp sperm, st statocyst, sv seminal vesicle, va vagina. Scale bars: 50 ?m in (A, C), 10 ?m in (B)