sizes in contrast to the other Monogenoidea. These foUiculi merge into a 

 common anterior transverse commisure which partially changes into an 

 oviduct at its middle part. These data are basically substantiated during 

 the examination of strongly compressed samples,' however, the description 

 of Brinkmann should be somewhat supplemented. Thus, first of all one 



must say that the ovary of Chimaericola 

 (Fig. 295) consists of numerous, 

 completely independent, separate 

 parts (folliculi) each of which has a 

 widened mace -shaped chamber, often 

 with several curvatures and 

 a more or less elongated canal — 

 little pipe. Stages of development 

 of the egg cells take place in the 

 chamber of a separate follicle, 

 already fully-ripened oocytes 

 ("which have cut themselves out" 

 see page 84) are located in the canal. 

 All the ducts of the separate folliculi, 

 often joining in pairs, lead to the 

 middle of the body where they merge 

 into a common, more or less rounded 

 "oocyte-receiver" from which the 

 oviduct emerges. There is no special 

 transverse commisure of the ovary 

 at all. It is apparently an erroneous 

 interpretation of pictures observed in 

 cross section. It is most probable 

 that Brinkmann mistook part of the 

 sex system from the ventral side (A) "little pipes" of the ovarian folliculi 

 and from the side (B). (According for this commisure. We were not 



to Brinkmann, 1952). able to count the number of folliculi; 



on the drawing of Brinkmann, the 

 number of lobes (folliculi) equals 12. In our preparations it is apparent 

 that the minimum number of little pipes is 15, and consequently there 

 are no fewer folliculi. Among Callorhychicola [according to the description 

 of Brinkmann (Brinkmann, 1952a)] the ovary is similarly arranged (Fig. 

 296), but consists of two groups of folliculi with independent oviducts 

 merging together afterwards. With this, one of the groups (the right) is 

 much smaller than the other and a smaller number of separate folliculi 

 comprise it. Similar structure of the ovary is very rarely encountered 

 among monogenetic trematodes. Thus, the ovary in Capsalidae (see page p. 416 

 475 ) is similar, although it is more coarsely arranged, and it is probable 

 that something similar exists also in Loimoidae (see page 370 ). On the 

 other hand, the similarity in the structure of the ovary in Chimaerichola 

 and Callorhynchicola with the ones among Gyrocotyloidea and tapeworms 

 (see page 475) is very important. Now we must say that the present 



Fig. 296. Callorhynchicola branch- 

 ialis Brinkmann, the diagram of the 



497 



