Dr. Holló Ferenc - Dr. Murai Éva szerk.: Parasitologia Hungarica 5. (Budapest, 1972)
miracidium the cilium-free terebratorium appears / photo 12 , fig. 4 /, 8-10 jUy in length in a state of rest. In the anterior view, special structures resembling smaller and larger papillae can be observed / photo 18 , fig. 6 /. Their role is unknown, but one part is supposed to be free nerve ends /the smaller ones/, or glandular cell outlets /the larger ones/. The cells of the first epidermal cell row covering the body of the animal are more or less trapezoid / photo lid, figs . 3_and 5/, their distal sides forming the sexagonal area /6 JJL/ on the peak of the terebratorium / figs . 3_ and 6/ where the above-mentioned papillae /photo 18 / are situated in bilateral symmetry /figs . 6_, 7 and 8/. The number, arrangement and size of the papillae may be considered constant. Investigations of the terebratioral papillae were conducted on species belonging to diverse families /Paramphistomidae , Diplodiscidae/. The individual body-parts are defined according to SWART /1967/, with some modifications. Tne orientation of the papillae can be given with axes decurrent across the symmetrically situated groups of papillae / fig . 6/. The first axis /Ti/ bisects the two lateral cells of the first epidermal cell row; these cell can easily be demarcated by 3 papillae being situated in the curve on their proximal side /fig. 3, 5 and J3/. In relation to the first axis, the second one /T^/ passes along papillae situated clockwise.white the third /T^/ counter-clockwise /fig. 6 /. The indication with letters a, b and c of the papillae-groups along the axes provides a possibility for the right determination of the position and number of the groups of papillae / fig. 6 /. The number of papillae is relatively constant, only in the groups "a" and "c" /T„/ could certain differences /1 or 2 papillae/ be found. Besides the terebratorium, 12 further papillae can be seen on the intercellular parts of the miracidium. Ten papillae appear between tne first and second epidermal cell rows: 3 each on the
