U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL 81. ART. 17 PL. 4 



OS^^ 



0-smm 



osmm 



os/r>m 



Osmm 



o-//v/r? 



1, Diochetos phrynoKomatis, a reconstruction of the e.xcretory system of a terminal segment; 2, 

 oblique section through a Cysticercus sp.; 3, oblique section through the same Cysticercus sp. 

 but showing the suckers; 4, Falcaustra chelydrae, posterior end of male, but showing only a por- 

 tion of the spicule; 5, Pharyngndon warneri, caudal end of female; 6, P. warnen. caudal end of 

 male; 7, Atractis carolinae, caudal end of male 



