Nachdruck verboten, 

 übersetzungsrecht vorbehalten. 



On Cephalogonimus vesicaudus n. sp. 



W. S. Nickerson, Hoffman, Minnesota. 



With Plate 8. 



The genus Cephalogonimus was established by Poieier (1886) 

 for tlie reception of a species of trematode obtained from a Senegal 

 turtle (Tetrathyrd) and whose most striking peculiarity is, as the 

 name suggests, the location of the genital aperture at the extreme 

 anterior end of the body in front of the oral sucker. To this type 

 form he gave the specific name lenoiri. A second species has been 

 referred to this genus by Staffoed (1902) under the specific name 

 americamis. Staffoed found this species in the intestine of American 

 frogs [Rana virescens and Rana clamata). A third form which may 

 be put in the same genus is found abundantly in the intestine of 

 the soft shelled river-turtles Aspidonedes and Amijda. It flrst came 

 to my attention in 1899 while I was upon the houseboat Megalops 

 maintained by the Minnesota Natural History Survey for the in- 

 vestigation of tlie fauna of the Mississippi and its tributaries. 

 Subsequent observations have shown that it is almost invariably 

 present in turtles of these two genera. For this species I have used 

 in manuscript the name vesicaudus and Pratt (1902) has referred to 

 it by that name in liis Synopsis of North American Trematodes. 

 No detailed description has been published. The new form agrees 

 however in almost every respect with the definition of the genus 



