[CEYLON PEAEL OYSTER FISHERIES -1906-SUPPLEMENTARY REPORTS, No. XXXIV.} 



REPORT 



ON SOME 



PARASITIC COPEPODA 



COLLECTED BY 



PROFESSOR HERDMAN, AT CEYLON, IN 1902. 



BY 

 CHARLES BRANCH WILSON, M.A., 



DEPARTMENT OF BIOLOGY, STATE NORMAL SCHOOL, WESTF1ELD, MASS. 



[WITH FIVE PLATES.] 



OF this small collection of Parasitic Copepods* obtained by Professor HERDMAN and 

 Mr. HORNELL at Ceylon it can be said with even greater emphasis than was declared 

 by Eev. T. E. E. STEJBBING of the Isopods from the same locality : " The interest of 

 the present collection is not to be measured by the number of species, or the number 

 of specimens, still less by the size of the animals."f 



There were only five vials of the Parasitic Copepods, and yet from these were 

 obtained four new species, two of which were the types of new genera. There 

 were also two other species which had been previously described, but both of which 

 were founded on a single sex and on a very limited number of specimens. Neither of 

 these had been seen since originally described forty years ago. Of one of them the 

 male sex is here added for the first time, while of the other many supplementary 

 details of structure are given. 



There was thus not a single species in the small collection which did not present 

 something new and interesting a truly remarkable record. 



* The main report on the large collection of free and a few parasitic Copepoda, by the late 

 Mr. I. C. THOMPSON and Mr. ANDREW SCOTT, will be found in Part I. of this work (1903) at p. 227. 

 t Part IV. of this Report, Supplementary Report XXIII, "On the Isopoda," 1905. 



