FISH PARASITES COLLECTED AT WOODS HOLE IX Isnx. 



By EDWIN LINTON, PH. D., 

 Professor of Biology, Washington and Jefferson College. 



The following report is divided into two parts. 



In Part 1 a list of the hosts which were examined, or from which parasites were 

 obtained, is given. In each instance brief mention is made of the parasites found, the 

 dates of examination are given, and where the stomach contents were noted a record 

 is entered. In nearly every case in which no note was made of stomach contents the 

 stomachs were empty. 



Adult trematodes and cestodes and a few nematodes have been identified. Many 

 larval cestodes and most of the nematodes have not yet been identified. 



The order of arrangement of hosts is substantially that of Dr. H. M. Smith, "The 

 Fishes found in the Vicinity of Woods Hole" (Bulletin of the United States Fish 

 Commission for ]897). 



In Part II descriptions are given of new species and of species new to the region. 



While this report has mainly to do with the entoxoa, I have given descriptions of 

 two ectoparasites: (1) A copepod, found in the cheek of a squeteague (Cynoscion 

 ref/aUn). (2) A tristomum (Epibdclla bumpusii sp. nov.), from the skin of a stingray 

 (Dasyatls centrum). In the description of the latter are incorporated some observa- 

 tions on the process of egg-making as it was seen in this interesting species. 



PATHOLOGICAL CONDITIONS. 



It was under consideration to arrange in a third part such cases as might be 

 referred to as pathological or diseased conditions. This proved undesirable, since it 

 would have caused needless repetition. For convenience of reference, however, are 

 here arranged the principal cases where damage, more or less serious, resulted to the 

 tissues of the host from the presence of parasites. 



1. Cyst with trematode ova, p. 297, figs. 82-84. 



2. Immature distmna encysted in the skin of the 



cnniier, p. 206, figs. 76-81. 



3. On the occurrence of cysts in the stomach-wall 



of the blue-fish, p. 301, fig. 101. 



4. On cysts in the stomach-wall of the black sea 



bass, p. 301, figs. 103, 104. 



5. Cysts from kidneys of scup, p. 301. 



6. Acanthocheiljis nidifex, p. 303, fig. lit!. 



7. Cyprinodon rarieyattis, p. 277. 



8. Galeocerdo ti</ri>nis(uot duo to ento/oa), p. 270, 



fig. 102. 



9. Moronc amcricana, p. 279. 



10. Caiofstomus commersonii, p. 276. 



Iii this connection reference may be made to Tctrarhynchus Mcolor, which was 

 found burrowing into the stomach coats of the leopard shark (Galeocerdo tif/rinus), and 

 to T. elongatus, whose extraordinarily long blastocysts appear to be always present in 

 the liver of the sunUsh ( Molci mola). Dibothrium plicatum appears to produce more or 



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