Occasional Papers of the Museum oj Zoology 5 



The vitelline glands begin at the level of the acetabulum and 

 extend to posterior part of the body. They are on either side of 

 the coeca with many more on the outer side and only a few scattered 

 on inner margin of intestinal branches. The genital field without 

 vitellaria occupies all the space between acetabulum and excretory 

 pore with coeca laterally — more than one-half the length of the 

 body. The male reproductive system is largely confined to the 

 lower third of the body while the female reproductive system 

 extends nearly to the acetabulum. 



Larva: Larval forms of Clinostomum intermedialis were found 

 encysted in muscle at base of tail, under skin of operculum, and in 

 the floor of the mouth of a catfish, Rhamdia quelen Quoy and Gai- 

 mard, collected by Dr. Pearse in the Rio Castano, July 7, 191 8. 

 The general appearance and structure are like that of the adult. 

 Length 6 mm.-7 .5 mm., width i mm.-i .5 mm. 



BIBLIOGRAPHY 



Braun, M. "Die Arten der Gattung Clinostomum, Leidy, " Zool. Jahrb., 

 Syst., Band XIV (1900), 1-50, 



Leidy, J. "Nomenclature of Parasites," Free. Acad. Sci., VIII (Phila- 

 delphia, 1856), 45. 



Looss, A. "Weitere Beitrage zur Kenntniss der Trematoden-Fauna 

 Aegyptens," Zool. Jahrb., Syst., Band XII (1899), 521-783. 



MacCullum, W. G. "On the Species heterostomum, " Amer. Jour. 

 Morph., XV (1899), 697-710. 



OsBORN, H. L. "On the Distribution and Mode of Occurrence in the 

 United States and Canada of Clinostomum marginatum, a Tre- 

 matode Parasite in Fish, Frogs, and Birds," Biol. Bull, of the Marine 

 Biol. Lab., XX (191 1), 350-67. 



