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

ing scolex and extremely spacious (,130-190 u), ventral excretory stems, with transverse anastomoses at the junction of the segments. Scolex 1-1*3 mm in diameter, height 0*8-1 mm. Diameter of the four muscular and deep suckers 4-80-560 yu, internal measurement 400 yu. Neck width 380-550 yu. Strobila successively widening, segments wider than long. Genital atrium alternating irregularly. Testes antiporal, their number 40-50, 40-50 yu in diameter.Prostatic gland absent. Pyriform cirrus pouch 200-250x 60-70 yu

. Cirrus 40 p, finely spinous. Vagina opening into atrium genitale behind cirrus. Receptaculum seminis 150-300 p. Female genital organs in the middle of the segments, poral . Ovary 5OO-65O yu in diameter composed of hundreds of clavate lobes. Lobed vitellary gland 200x100 p. Mature segments almost quadratic. Reticular uterus filling the medullar parenchyme (Figs. 9-11).Eggs rounded, 35-40 p. Bulbus of pyriform apparatus 12 p., length of embryonal hooks 5-6 p. Hymenolepididae Raillet et Henry, 1909 Hymenolepis horrida (Linstow, 1901) Hosts: Microtus arvalis, Pitymys subterraneus and Clethrionomys glareolus. - Localities: DÖmsöd, Mts. Pilis, Lake Velence, N shore of Lake Balaton, Mts. Bakony, Vasi hegyhát, Mts. Sopron (Table 2). The occurrence of this species at any part of Hungary is possible, especially in wet and hilly regions. - Localization: small intestine. - Extensity and intensity: M. arvalis: 1%, 2-3 specimens; P. subterraneus: 12*5%, 3-6 specimens; C. glareolus: 11*8%, 1-5 specimens. Description: Length 30-60 mm, width 1-1*2 mm. Scolex unarmed. The shape of the scolex differs conspicuously from that of other unarmed Hymenolepidids : the well developed suckers enlarging from the scolex giving the shape of a quadrifoliate clover to the scolex from superior view.Testes situated in a triangle. Cirrus pouch 170x30 yu. Cirrus long and thin, covered with spines finer than those in H. asymmetrica (Pigs. 12-14). Mature