554 MAYOR. 



found attached by its anterior end to an undetermined parasite, prob- 

 ably some species of Myxidium or Chloromyxum, which itself is 

 attached to the epithelium of the gall bladder. Nine out of ten 

 specimens of U. chuss examined were found to be infected; (2) in the 

 gall bladder of the eel pout, Zoarces angularis, from the same waters. 

 The attachment of the myxosporidium was not observed in this host, 

 although the modification of the anterior end of the parasite for 

 attachment, as in the parasite of U. chuss, was seen. Each of the 

 eight specimens of Z. angularis examined was found to be infected; 

 (3) in the gall bladder of the winter flounder, Pseudopleiu'onectes 

 americanus. Here no attachment of the myxosporidium was seen. 

 Vegetative forms were found in abundance in the fishes examined, but 

 spores only rarely. Of twenty-five flounders examined, all contained 

 the parasite. 



Comparison toith other sjiecies. In size the spores resemble most 

 closely those of C. appendiculata Thel. (Thelohan, '95, p. 337). As 

 Thelohan does not give a figure of the spore, and as the only measure- 

 ments given are those of the length and sutiu-al diameter, it is impos- 

 sible to carry, the comparison further. The myxosporidium differs 

 from that of C. appendiculata as described by Thelohan in being often 

 found attached. 



III. Material and Methods. 



The material for the present investigation was collected in Passa- 

 maquoddy Bay at or near the mouth of the St. Croix River during 

 August and September, 1913.^ The hosts of the parasites, in the case 

 of the common Hake, — Urophycis chuss, — and the Eel pout, — 

 Zoarces angularis, — were caught on the "trawl" * with clam, whelk 

 or herring as bait, and in the case of the winter flounder, — Pseudo- 

 pleuronectes americanus, — in the seine on low sand flats. The 



3 It is a pleasure to express my obligation to the Board of Directors of the 

 Marine Biological Stations of Canada for kind permission to work at the 

 Biological Station of the Canadian Government at St. Andrews, New Brnns- 

 wick, Canada, and my great indebtedness to Dr. Huntsman, the ciuvitor of 

 the Station, for putting the resources of the Station at my disposal, and for 

 many personal services in obtaining and arranging for the preservation of the 

 living material. 



4 The trawl used on the coast of New Brunswick is a set-line, a mile or so in 

 length, with hooks, spaced about two fathoms apart, set on the .sea bottom 

 between two anchors. 



