Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 7. (Budapest, 1974)

5% infection in M. arvalis populations. The intensity of infection is always high; the larvae sometimes seem to fill the abdominal cavity. The common voles captured at Tiszabercel and in Bük were infected with 143, and 1750 specimens, respectively. Adult T. crassiceps has been found in Hungary in Vulpes vulpes, Mustela eversmanni, and other Carnivora (MURAI and TEHORA, 1973 a). Description of the larval stage (Cysticercus): 2 mm long elliptical larvae, situating freely in the abdominal cavity, or adhering to the mesenterium.Invaginated scolex with four suckers, 250 ja in diameter, and a double circle of 36 hooks 135-145 yu, and 192-202 u in length (Pig. IE). An analyse of the hooks of 143 T. crassicepslarvae collected from a common vole specimen confirmed the statement of MURAI and TENORA (1973a) based on a study of H. taeniaeformislarvae

. that the formation of the. lamella preceeds that of the manubrium during the process of larval development. Larva of Hydatigera taeniaeformis (Batsch, 1786) Intermediate hosts: Microtus arvalis, Clethrionomys glareolus, Ondatra zibethica. It was found in Pitymys subterraneus by TENORA (1967). - Localities: in M. arvalis: Mts. Mátra, N shore of Lake Balaton, Comitat Vas; C. glareolus: Mts. Mátra, N shore of Lake Balaton; 0. zibethica: Vecsés. On the basis of NECHAY's (1973) data, this tapeworm occurs on the whole of Hungary. Localization: liver. - Extensity and intensity: in M. arvalis 5%, 1-7 cysts; C. glareolus: 2%, 1-3 cysts, 0. zibethica: four cysts in one case. Adults of this species have been recorded in Hungary from Pelidae (MURAI, 1972; MURAI and TENORA, 1973a; NECHAY, 1973). Description of the larval stage (strobilocercus

): Larvae are