TABLE OF CONTENTS 



Page 



INTRODUCTION 329 



DESCRIPTION OF SPECIES 



ASPIDOGASTREA 



ASPIDOGASTRIDAE 



Lobatostoma pactficum, new species 330 



GASTEROSTOMATA 



BUCEPHALIDAE 



Bucephalus <varicus, new name 335 



Bucephalus introversus, new species 338 



Prosorhynchus ozakii Manter, 1934 339 



Prosorhynchus aculeatus Odhner, 1905 340 



Prosorhynchus rotundus, new species 340 



Prosorhynchus gonoderus, new species 342 



Prosorhynchus pacificus, new species 343 



PROSOSTOMATA 



Gyliauche n id ae 



Megasoleninae 



Choanodera caulolatili, new genus, new species .... 345 



Apocreadium mextcanum Manter, 1937 348 



Apocreadium longisinosum Manter, 1937 348 



Allocreadiidae 



Lepocreadium bimarinum, new species 348 



Opechona pharyngodactyla, new species 350 



Opechona orientalis (Layman, 1930) 352 



Lepidapedon hancocki, new species 353 



Lepidapedon nicolli Manter, 1934 354 



Pseudolepidapedon balislis, new species 355 



Pseudocreadium scaphosomum, new species 356 



Pscudocreadium spinosum, new species 359 



Anisoporus eucinosiomi, new species 360 



Anisoporus thyrinopsi, new species 362 



Dactylostomum 'vitellosum, new species 363 



Opecoelus and Opegaster 364 



Opecoelus mexicanus, new species 365 



Opecoelus xenistii, new species 366 



Opecoelus inimici Yamaguti, 1934 367 



Opegaster acuta, new species 367 



