POLYCLAD FLATWORMS — ^HYMAN 81 



apparatuses; others have but a single male apparatus, medianly placed. 

 However, even this information is lacking from many of the old 

 descriptions. It is desirable to figure the details of the copulatory 

 apparatus as a further aid to identification, despite the fact that such 

 details are very similar throughout the genus. However, as the 

 copulatory apparatus in the Cotylea is near the anterior end, sectioning 

 it destroys the most important part of the specimen and it can be 

 done profitably only if several specimens are available. As I could 

 not be sure that tlie smaller specimen here is identical with the 

 larger one, I thought it useless to section the smaller one. Both, 

 therefore, have been preserved intact. 



Literature cited 



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