Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 6. (Budapest, 1973)
equally developed' anterior and posterior sphincters. But it also differs by weakly developed interior longitudinal and median circular muscle-layers, and by smaller anterior and posterior sphincters(Pig .1) . It may be termed a new type of pharynx, designated as the Nematophila type. It is 900 Ja long and 650 wide.Its exterior longitudinal muscle layer is well-developed, 2,5 yu wide (Pigs.l, 2). The widest part is in the middle third, tapering towars the anterior and posterior ends and uniting with the interior longitudinal muscle layer. The interior longitudinal muscle layer is relatively less developed, 50 yU. wide (Pigs. 1, 2). Its fibers do not form a uniform, compact layer, made up of bundles of coarse fibres, ramifying along the exterior margin of the pharynx and coming through the interior longitudinal muscle layer (Pigs.l, 2). The middle circular muscle units are seen in the interior quarter of the pharynx, slightly developed (Pig. l). The interior circular muscle units are well-developed, forming the anterior sphincter at the tip of the pharynx. Anterior and posterior sphincters are present, nearly of the same size, the anterior one 25 yu in diameter, while the posterior measures 50 x 25 ix (Pig. 1). Legends to figures Pigs. 1-2: Median sagittal and cross sections of pharynx 1 = Median sagittal section; 2 = Cross section in the middle As - anterior sphincter, ELL - exterior longitudinal muscle layer, ICL - interior circular muscle layer, ILL - interior longitudinal muscle layer, MCL - middle circular muscle layer, Ps - posterior sphincter Pigs. 3-4: Median sagittal section of genital opening - Cp cirrus pouch, Ga - genital atrium, Gp - genital papilla, Gs genital sphincter, Sp - sphincter papillae Pigs. 5-6: Median sagittal section of acetabulum - 5 = detail of dorsal exterior circular muscle units; 6 = ventral half of acetabulum; D.e. - dorsal exterior circular muscle units, RL radial muscle layer, V.e. - ventral exterior circular muscle units, V.i. - ventral interior circular muscle units
