TABLE OF CONTENTS 



. . PAGE 



Introduction 



General Discussion 7 



Forms Previously Described from North America 8 



Methods of Study 9 



Description of Species 

 Monostome Cercariae 



Cercaria urbancnsis Cort 1914 11 



Knoystment of Cercaria urbancnsis 12 



Redia of Cercaria urbancnsis 13 



Mature Cercaria urbancnsis 14 



Aniphistome Cercariae 17 



Cercaria inhabilis Cort 1914 18 



Redia of Cercaria inhabilis 21 



Cercaria diastropha Cort 1914 22 



Redia of Cercaria diastropha 23 



Critique of Cary's Work on Diplodiscus temporatus 24 



Cercaria Caryi Cort 1914. 30 



Distome Cercariae 31 



Gymnocephalus Cercariae 31 



Megalurous Cercariae 



Cercaria megalura Cort 1914 31 



Redia of Cercaria megalura 32 



Echinostome Cercariae 36 



Cercaria trivohis Cort 1914 37 



Redia of Cercaria trivolvis 39 



Cercaria rubra Cort 1914 40 



Appendix to Echinostome Cercariae 



Cercaria rcflcxae Cort 1914 41 



Redia of Cercaria rcflcxae 43 



Microcercous Cercariae 



Cercaria trigonura Cort 1914 44 



Redia of Cercaria trigonura 46 



Furcocercous Cercariae 



Cercaria douthitti Cort 1914 49 



Xiphidiocercariae 52 



Polyadenous Cercariae 



Cercaria isocotylea Cort 1914 53 



Cercaria polyadcna Cort 1914 55 



Cercariae Ornatae 57 



Cercaria hemilophura Cort 1914 58 



Microcotylous Cercariae 59 



Cercaria leptocantha Cort 1914 60 



Cercaria brevicaeca Cort 1914 61 



