Dr. Kassai Tibor szerk.: Parasitologia Hungarica 1. (Budapest, 1968)
base, 0.350 to 0.50Q mm In length, and never less than 0.220 mm even in juvenile specimens. The apical width of the proboscis is 0.140 to 0.170 mm, and at the base is 0.120 to 0.150 mm. There are twelve uneven rows of hooks, having 8 hooks per row, seldom 7 or 9. The roc of the apical hooks is massive and slightly biifurcated. The hooks gradually decrease in size toward the base, noticeably so beyond the fifth row of hooks (Fig. 3). The root of the lower hooks is simple. The barb length is 0.025 mm (average of second row of hooks), and the height of hooks 0.028 mm. . In the fifth row, these values decrease to 0.018-0.020 mm. The shape and dimensions of the hooks are constant, the above values occurring even in immature specimens.The proboscis sheath is a double-walled muscular organ with a distinct spiral pattern on its external surface; 0.500 to 0.840 mm (Fig. 2). Lemnisci are ribbon-shaped, 4 to 14 mm long, 0.070 to 0.080 mm broad, and losely intertwined in the beiy cavity (Fig. 2). Males are 40 to 50 mm long, with a trunk width of about 1 mm. Annulation is less conspicuous on males than on females, pseudosegmentation being hardly discernible on juvenile males. The anterior and posterior ends of the body are not annulate , and the posterior fourth curves in. The male sexual organs are situated in the posterior third of the trunk (Fig. 5), the testes being large, oval, adjacent, and having a combined size of 4 to 5 mm. Eight cement glands are present , the diameter of one gland being 0.300 mm. Females are 59 to 210 mm long, the greatest width of body being at its posterior third: 2 to 3 mm. Pseudo—segmentation is conspicuous even in immature specimens. An immense number of eggs is oresent; their sheaths thin, and weakly resistant (Fig. 4). Dimensions of mature eggs found in the Spalax specimens are 0.088 by 0.050 mm, while those found in Citellus specimens, used for comparison, are 0.100 by 0.067 mm (in a 111 mm long female). . The length of immature eggs in juvenile females is 0.040 mm. Dimensions of embryos are 0,070 by 0.031 mm, embryonal hooks being 0.010 to 0.012 mm long. M. moniliformis (Brems er, 1811) Meyer, 1933, is a cosmopolitan spe112
