female sex ducts at the same time in contrast to the remaining Dactylo- 

 gyridae which can have only one egg. This is clearly apparent from 

 Figure 271. 



As regards the structure of the intestinal tract, in spite of 

 the fact that it demonstrates considerable complication in comparison 

 with the rest of the Dactylogyridae, nevertheless the presence of 

 lateral outgrowths near the trunks of the intestine is not characteristic 

 only for the present species. Similar outgrowths are encountered among 

 Tetrancistrum sigani Goto and Kikuchi (Ancyrocephalinae) and they are 

 also noticed among Dactylogyrus iwanowi Bychowsky (Dactylogyrinae). 

 Apparently the reasons for this phenomenon should be sought in the 

 increase of tlie general size of the body and not only and even not so much in p. 355 



the different phylogenetic state of the separate species. All in all, 

 what has been said before gives adequate reason to consider L. molvae 

 as a very specialized species fully deserving isolation into a special 

 subfamily Linguadactylinae. 



2. Diplectanidae Bychowsky, fam. nov. 



Dactylogyridae Bychowsky, 1933 part. 



Dactylogyrinea having relatively small or middle sizes in 

 the adult state. The attaching apparatus consists of a chitinous 

 armature, which includes 14 edge hooks (indications of the presence of 

 6 pairs are erroneous) and 2 pairs of middle; the latter are connected 

 by means of 2 (?)--3--5 chitinous plates into a single system. In 

 addition to this, the representatives of this family have special paired 

 attaching formations lying above the disc and also partially on it, on 

 the dorsal and ventral sides in the shape of small rounded convexities 

 equipped with numerous chitinous thorn-shaped little hooks or thin 

 thread-like plates located more or less in concentric rows 

 ("squamodisc"). In a number of cases these convex secondary discs 

 are supplemented by chitinous thorns located across or below the con- 

 centric rows of little hooks. Finally, among other species, the 

 secondary discs are replaced by groups of powerful spear-shaped 

 thorns lying in a fixed order on the dorsal and ventral sides of the 

 body and occupying approximately the same location as the secondary 

 discs and apparently are homologous to the chitinous formations of 

 the latter. The anterior end of the body has paired cephalic glands 

 and 2 pairs of eyes. The intestinal branches end blindly and more 

 rarely merge at the posterior end of the body. As a rule the ovary is 

 flask-shaped; the vaginal duct exists, it is single, the vitellaria are 

 strongly developed, paired. The copulatory organ is chitinous, for the 



421 



