Dr. Holló Ferenc szerk.: Parasitologia Hungarica 4. (Budapest, 1971)

0.130 mm near ovary. Uterus winds to right and left of midline, 0.4-00-0.600 mm wide; Eggs accumulate in an extensive uterus sac situated above and ventrally of cirrus pouch and alternating to right left of midline; they are discharged through a tocostoma opening onto the ventral surface of the segment. Uterus sac occupies half of the medullary parenchyma dorso-ventrally

, and one-third of it laterally. Diameter of tocostoma: 0.060-0.080 mm. Large numbers of vitellary glands measuring 0.033x0.053 mm form a homogeneous layer in the cortical parenchyma. Eggs are oval, yellow, non embryonated, measure 0.033x0.052 mm. 2. Ql mm Pig. 2 B. claviceps: sagittal section of mature segments According to the literature (JARECKA, 1959), the intermediate host is the crustacean Macrocyclops albidus, which occurs in Hungary. The worm species must therefore be considered a constant member of the fauna of the Balaton and of our home wa-