middle plate is absent. In addition, on the dorsal side of the disc there are 

 four symmetrically located, small sucker-shaped formations each with a 

 cuticular thickening along one edge. The intestinal tract is in the shape of 

 one trunk without lateral outgrowths. There are no eyes. The copulatory 

 organ is chitinous with a strongly waving pipe and complex supporting 

 apparatus. The remaining characteristics are just as among Tetraonchidae. 



Parasites of marine Perciformes (Uranoscopidae). 



Type and only genus Tetraonchoides, Bychowsky, 1951. 



We have no special remarks at the present time concerning the 

 present family because its description was given relatively recently (Bychowsky 

 1951). We shall only note as strange the fact that_T_. paradoxus Bychowsky, 

 1951 has not been found at the present time by any of the Italian researchers, 

 although it exists in the Mediterranean Sea and apparently is widely dis- 

 tributed, because it was discovered in huge quantities on the only Uranscopus 

 species examined by us in 1954 from the Bay of Naples (Italy). 



4. Family Bothitrematidae Bychowsky, fam . nov . 



(Figs. 19, 286, 287) 



Bothitrematinae Price, 1936. 



Tetraonchidea, having middle sizes in the adult state. The 

 attaching apparatus consists of a sucker -shaped disc and its chitinous 

 armature consisting of 16 edge hooks, 2 large middle hooks with a connecting 

 plate and of a ring of pipe -shaped, flattened plates lying with their longi- 

 tudinal axes along the radii, tightly against or almost adjacent to each other 

 at a certain distance from the exterior edge of the disc. This ring of plates 

 is interrupted on the anterior edge and at this place, but closer to the center 

 of the disc is located a special coarse supporting plate similar to the one 

 among Tetraonchoididae. The anterior end of the body has a pair of 

 glandular cephalic lobes at the place of the cephalic glands of Tetraonchidae 

 and 2 pairs of eyes of which the posterior one has a tendency towards 



merging. The intestine is in the shape of a single, sac-shaped trunk. The 

 ovary is round, it is lying in front of the single testis. The vitellaria are 

 strongly developed and fill the entire body from the pharynx to the attaching 

 disc. The structure of the ducts of the sex system has not been studied. 

 The copulatory organ is chitinous, pipe-shaped. The male sex opening is on 

 the ventral side of the body. 



Parasites of marine Pleuronectiformes (Bothidae). 



472 



