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The life history of Diplodiscus temporatus Stafford. 



With especial reference to the development of the 



parthenogenetic eggs. 



By 



Lewis R. Cary (Princeton, New Jersey U. S. A.), 



With Plate 30-33. 



Table of contents. 



page 



Introduction 595 



Material and methods 595 



Part I. Descriptive 598 



A. The adult worm 598 



B. Larval forms 601 



1. The sporocyst 601 



2. The redia 602 



3. The cercaria 604 



4. The swarming and encystment of the cercariae . . 607 



Part II. Experimental determination of the life history . . . . 612 



Part m. Embryological. 



1. The origin and maturation of the parthenogenetic 



eggs 617 



2. The segmentation of the eggs and the formation of 



the germ layers 633 



3. The development of the cercaria 647 



Part IV. General considerations 648 



Summary 650 



