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 urbanensis Cort 1914 11 



Encystment of Cercaria urbanensis I-' 



Redia of Cercaria urbanensis 13 



Mature Cercaria urbanensis 14 



Amphistome Cercariae 17 



Cercaria inhabilis Cort 1914 iS 



Redia of Cercaria inhabilis 21 



Cercaria diastropha Cort 1914 22 



Redia of Cercaria diastropha 23 



Critique of Cary's Work on Diplodiscus teiuporatus 24 



Cercaria Caryi Cort 1914 30 



Distome Cercariae 31 



Gymnocephalus Cercariae 31 



Megalurous Cercariae 



Cercaria mcgalura Cort 1914 31 



Redia of Cercaria mcgalura 32 



Echinostome Cercariae 36 



Cercaria trivolvis Cort 1914 3~ 



Redia of Cercaria trivolvis 39 



Cercaria rubra Cort 1914 40 



Appendix to Echinostome Cercariae 



Cercaria reflexae Cort 1914 41 



Redia of Cercaria reflexae 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 lieinilophura Cort 1914.. 58 



Microcotylous Cercariae 59 



Cercaria leptocantha Cort 1914 60 



Cercaria brcvi caeca Cort 19 14 , 61 



