517] 



LARVAL TREMATODES—CORT 



71 



EXPLANATION OF PLATES 



Unless otherwise stated all figures are drawn with a camera lucida. 



The lettering on some toto drawings of the cercariae was omitted by 

 error. The descriptions in the text will be sufficient to make the struc- 

 ture clear. 



ABBREVIATIONS USED 



ab annular bands of muscle lc 



ac acetabulum Is 



acr anterior collar of redia ml 



bp birth pore of redia n 



eg cystogenous glands os 



ccg cephalic glands p 



cm cystogenous material pb 



cr cercaria in redia pc 



dc ducts of cephalic glands pi 



e eye-spot pr 



es esophagus ra 



ex excretory system s 



exv excretory vessel sc 



gb germ ball sg 



i intestinal cecum of cercaria sw 



ir intestine of redia vt 



la locomotor appendages of redia 



large central cells of tail 

 lobes of snail's liver 

 muscle layer 

 nervous tissue 

 oral sucker 

 pigmentation 

 pharyngeal bulb 

 parenchymatous cells 

 pigment line 

 pharynx of redia 

 reproductive anlage 

 stylet 



cercaria in sporocysts 

 stylet glands 

 wall of sporocyst 

 excretory vessels of tail 



