to the part of the connecting apparatus of the hooks of Calceostoma. As 

 regards Anonchohaptor, judging from the description and the figure of 

 Mueller (Mueller, 1938) its middle hooks do not differ in form (?) and size 

 from the edge ones, in connection with which the author also considers 

 them as edge hooks in spite of the fact that they lie in the center of the 

 disc and not along any of its edges as should have been in a similar case. 



The genus Calceostomella was described by Palombi (Palombi, 

 1943b) inaccurately. In addition to what has been said before, he writes 

 that the intestinal trunks in C. inermis do not merge. This is not true, 

 actually they merge with each other somewhat above the end of both trunks 

 as is apparent front Fig. 189. However, the separation of representatives 



of the genus Calceostomella seems 

 correct to us because the genus is 

 distinguished by the absence of con- 

 necting plates between the middle 

 hooks, by a completely different 

 shape of the ovary, by the presence 

 of the vaginal duct and by other more 

 secondary characteristics. Unfortu- 

 nately we do not have the material 

 on the genus Calceostoma and it was 

 not possible to verify the correctness 

 of the indications pointing to the 

 absence of a vaginal duct among its 

 representatives. However, it is 

 very probable that these are errors 

 of researchers, because until 

 recently it was supposed that Calceostomella inermus did not have a vagina, 

 the presence of which was shown only by Palombi in 1943. 



As regards Anochohaptor, in spite of the fact that this genus 

 is sufficiently removed from the two indicated above it nevertheless 

 apparently enters into the circle of the family as Price first indicated 

 (see Mueller, 1938). However, for complete certainty in this case, 

 further detailed study of the attaching apparatus and the development of 

 representatives of the present genus is indispensable. The doubts which 

 arise among us are based on the sharp distinction among the hosts and 

 their habitats. In addition to that the structure of the cephalic end in 

 Calceostoma and Calceostomella apparently differs from that of Anoncho- 



Fig. 273. Calceostoma calceostoma 

 (Wagener), middle hook of the disc 

 and its connecting plate. Enlarged 

 180 times (according to Palombi, 

 1943). 



D. 363 



haptor. This can only be verified on live or specially fixed material. 



The inclusion of the genus Fridericianella into Calceostomatidae 

 is made conditionally. This genus, described by Brandes (Brandes, 1894) 

 from the egg of Arius comimersoni (Lac. ) fronn Brazil has, on the whole, 

 been insufficiently studied. ^ Unfortunately, besides this we did not have 

 the work of Brandes himself and could only use the data from corresponding 



431 



