Dr. Holló Ferenc - Dr. Murai Éva szerk.: Parasitologia Hungarica 5. (Budapest, 1972)

Table 4. investigated T

l T

2 T

3 Total species a b c a b c a b c Paramphis tomum daubneyi 2 1 2 8 1 b 6 1 6 35 Diplodiscus subclavatus 2 1 2 4 1 4 4 1 4 23 lower part of the dorsal cells, and 2 papillae ventrally at the first and fourth cells between the second and third rows /

figs

. 3_ and 5/. The body of the miracidium is covered externaly with flat epidermal cells in 4 transverse rows, according to the formula 6:8:4:2 = 20. In the first row there are 6 trapezoid cells, 23-25x15x20 /a. in size. The second row consists of 8 long, narrow oblong cells, 40-48x15-21 /a- in size. The four cells in the third row are, though rectangular, shorter and wider: 30-34x x20x24 /4,. The fourth row consists of 2 more or less triangular cells, 15-20x15-25 /u- in size /

photo 19

, f igs

. _3 and _5_/. The epidermal cells are 2-2,5 ju, thick, their surface is covered with cilia. The cilia are 12-13 /j, in length at the level of the first cell row and 8-9 /4, at the caudal part /

fig

. 4/. The epidermal nuclei can easily be studied on preparations stained with methyleneblue and haematoxyline

. The nuclei in the first three cell rows appear in the posterior part of tne cells, near the cell membrane, in the fourth row in the anterior part. Tne nuclei are bean-shaped, arcuate and here and there constricted. They vary in size /8-12 x 2-3 yu/« and the largest ones are those of the last row /fig. 3

/. Directly under the epidermal cells a thin, transparent layer, the subepithelium can be found.Its presence is indicated rather