Cotylogaster occidentalis n. sp. 



611 



vitellary glands and ducts, in the presence or absence of a Laurer's 

 canal and in the presence or absence of a penis. It is possible that 

 such generic Separation of the two forms may eventually beconie 

 desirable but in the present State of our knowledge of the family I 

 consider a conservative attitude in regard to the formation of new 

 genera the wiser one. 1 have therefore included this species in Monti- 

 CELLi's genus Cotylogaster making such modifications in the definition 

 of the genus as given by Monticelli and Braun as the characteristics 

 of the new form make necessary. 



So many modifications of the Statement of family and generic 

 characteristics of the several members of this family have become 

 necessary by reason of the additions to our knowledge of them made 

 since the publication of Monticelli's revision and Braun's Classifi- 

 cation based upon the latter that it seems best fully to restate the 

 Classification of the family. The Classification which follows is in no 

 sense a new one but merely such a modification of that given by 

 Braun ('89^'93), following Monticelli ('92), as is sufficient to in- 

 corporate the facts made available since the publication of the pre- 



