Occasional Papers of the Museum of Zoology 3 



testes are intermingled and occupy the same regions while in 

 Carophyllaeus laniei the testes and vitelline glands occupy separate 

 areas — the vitelline glands being immediateh* lateral to the 

 numerous small irregular testes. 



One sucker caught in Green Lake, Wisconsin, August 25, 1919, 

 contained twenty-four adult Carophyllaeus laruei. Two suckers 

 caught in Lake Mendota, Wisconsin, were found to be infected 

 with this same species of Carophyllaeus. 



Larvae of Carophyllaeus laruei were found in the peritoneum 

 of Roccus chrysops (Rafinesque) in Lake ^Slendota. These larval 

 forms measure from . 5 to i mm. in length and . 2 to .3 mm. in 

 width. Carophyllaeus larvae are characterized by a tail-like 

 structure projecting from the anterior end at the point where 

 the scolex is invaginated. 



Plagiorchis Liihe 



Characteristics of genus: The body is elongate oval, and 

 covered with minute spines. Pharynx and esophagus are present 

 and of approximately equal length, crura reach to posterior end. 

 Genital pore is anterior to acetabulum. Cirrus sac curves around 

 and reaches posterior margin of acetabulum. Testes are round 

 to oval and are separated by uterine braches. No receptaculum 

 seminis. Ovary spherical, at inner end of cirrus sac. Vitellaria 

 have many closely crowded follicles usually reaching posterior end. 

 Eggs numerous. Found in intestine of insectivorous vertebrates, 

 chiefly birds. Infection probably through insects. 



Plagiorchis corti, new species 



Type specimen: Cat. No. 198. Museum of Zoology, Uni- 

 versity of Michigan; taken from intestine of Schilbeodes gyrinus 

 (Mitchill) from Lake Mendota, Wisconsin, September 24, 1919; 

 A. S. Pearse, collector. 



