ON THE DEVELOPMENT OF PARASITIC 



COPEPODS. 1 



PART I. 



J. F. McCLENDON. 



CONTENTS. 



I . I n trod action 37 



II. Historical 39 



III. Anatomy of the reproductive organs 39 



IV. Oogenesis and maturation 42 



1 . Oogenesis 42 



A . The dichel estid 42 



B. Lamargus muricaftis 43 



C. Pa n darns sinuatus 44 



2. Maturation 44 



A. Panda rtts sinuatus 44 



B. Lmmargus muricatus 45 



C. The dichelestid 45 



V. Spermatogenesis 47 



VI. Polarity of the egg 49 



VII. Summary 50 



VIII. Bibliography (see part II. of this paper) 76 



IX. Explanation of plate 50 



x 



The work herein presented was begun at Wood's Hole, 1904, 

 with a view of determining the effects of pressure on the eggs of 

 parasitic copepods. Owing to technical difficulties, three sum- 

 mers have passed with few experimental results, and in conse- 

 quence the present paper is chiefly of a morphological nature. 



I obtained parasitic copepods from fish caught in traps of the 

 Marine Biological Laboratory and the U. S. Fish Commission, 

 at Woods Hole. It was usually necessary to go to the trap to 

 get them fresh, or in the case of some Caligidae to catch them 

 before they left the fish. 



Most of the work was done on Pandants sinnatus Verrill, 

 Lceniargits muricatus Kroyer (collected by Dr. Conklin), and a 

 new species (text Fig. 3) of the family Dichelesteidse and of a new 



1 Thesis accepted by the Faculty of the Department of Philosophy of the Uni- 

 versity of Pennsylvania toward the degree of Doctor of Philosophy. 



37 



