that 3 genera are related to it (it is not clear to us which third genus 

 Poche had in mind because in the text of his work the names of the genera 

 are not cited). In his doctoral dissertation Price (Price, 1936) ascribed 

 the genera Phyllo cotyle and Plectanocotyle to the family Mazocraeidae 

 without indicating liis reasons for doing so. Sproston (Sproston, 

 1946) in her re'sume'does not agree with Poche or with Price and retains 

 the subfamily Plectanocotylinae Monticelli ascribing it to the family 

 Discocotylidae Price. 



We had at our disposal con- 

 siderable material of Plectano- 

 cotyle from the Mediterranean 

 Sea and a number of regions of 

 the North Atlantic and several 

 samples of Octoplectanocotyle 

 from the Mediterranean Sea. 1 



p. 429 



Fig. 30Z. Plectanocotyle gurnardi 

 Beneden and Hesse, attaching clamp 

 of adult wornni from the gills of Trig la 

 gurnardus L. from the region of north 

 west Ireland (Atlantic Ocean). I-- 



1 



The representatives of the 

 genus Octoplectanocotyle were 

 first encountered in Europe by us. 



On the basis of the study of this 

 material we succeeded in obtaining 

 a number of new data about the 

 structure of Plectanocotylidae, 

 and first of all of their attaching 

 apparatus. The clamps of 

 Plectanocotyle (Fig. 30Z) resemble 



those of Mazocraeidae but differ 

 slightly by the fact that their 

 anterior valve does not have a 

 continuous chitinous surface but 

 Attaching clamp cut in half and unfolded; basically consists of muscular 

 on the top- -anterior valve and on the and connective tissue parts 



bottom the posterior; II, III, IV-- sinnilar to the valves of Disco- 



Separated (steamed apart or dissected, cotylidae (see page 425 ). In 

 nobis) chitinous parts of the clamp. 



Explanation in the text. 



contrast to the anterior valve, the 

 posterior one represents a 

 similar strong chitinous formation 

 as in Mazocraeidae. As a whole. the clamp bears 7 separate chitinous parts. 

 On its bottom is located a flexible plate, not very wide in the anterior part 

 and bearing wing -shaped outgrowths in the posterior part (Fig. 302, B). 

 This plate corresponds to the central plate (which bears the aperture) of 

 Mazocraeidae and apparently is honiologous to it. It lies in such a way 

 that its smaller anterior part is located in the anterior valve. The plate 



514 



