01 MM 



rule the muscular cluster terminates by a special sucker near the internal 

 section of the clamp. In spite of the indication (to the contrary, nobis ) by 

 the several authors, the clamp of Choricotyle in the normal state is not 

 open "sucker-shaped" or "cup-shapedV but is typically clamp-shaped. 



The clamps of Heterobothrium 

 af finis (Linton, 1898) studied by us have a 

 similar degree of complexity (Fig. 

 305). In contrast to Choricotyle , the 

 upper end of the basic middle plate 

 is weakly widened and is almost 

 completely symmetrical, whereas 

 the lower end is sharply asymmetrical 

 with an outgrowth at one side. In 

 addition to this, the middle part of this 

 plate (Fig. 305, A) forms a large 

 triangular membrane -shaped growth 



Fig. 303. Diclidophoropsis tissleri oriented in the saine direction as the 



Gallien, unfolded clamp of an adult lower large outgrowth. 1 



individual from the gills of ___^__ 



Malagocephalus laevis (Lowe) near 



the western shores of England 



(Atlantic Ocean). Explanation in 



the text. (In this and subsequent 



drawings, 304-306, the homologous 



parts of the attaching clamp are 



indicated by the same letters. ) 



1 



The drawing of the clamp of this 

 species by Price (Price, 1943a) is 

 incorrect; closer, but also inaccurate 

 is the description and drawing in the 

 work of Nagibina (Nagibina, 1953). 



The anterior lateral plates are approximately the same size, just as are 

 the remaining lateral plates. ^ The muscular cluster forming the weakly 



In addition to the described structures, among all Diclidophoridae just 

 as Diclidophoropsis there are chitinous sticks lying in a fixed order on the 

 interior surface of the posterior valve of the clamp which is similar among 

 different species. In separate cases, in addition to that, more or less well- 

 developed thorns can be formed on the exterior surface of the interior valve, 

 as for instance in Diclidophora denticulata (Olsson, 1876). 



developed sucker enters into the clamps into the sector formed by the p. 435 



anterior lateral plate and the triangular and lower lateral outgrowths of the 

 middle basic plate. The clamp also does not have the shape of a sucker or 

 cup in the normal state. 



The clamps of Diclidophora are arranged more complexly 

 than any of those studied by us (Fig. 306). Here we observe the merging 



520 



