AKT. 1 TREMATODE PAKASITES OF BIRDS LINTON" 6 



Forms which were obtained from pedicelled cysts on the serous 

 coat of the pancreas, although differing greatly in appearance from 

 the free form, appear to belong to the same species. This form 

 (tig. 3) is attenuate anteriorly, tapering from near the posterior 

 end, where the breadth in one specimen was 0.80 mm. to a breadth 

 of 0,05 mm. near the anterior end. The entire length of this worm 

 was 15 mm. In this specimen the genital sucker is about 1.20 from 

 the anterior end, and is 0.06 in diameter. The breadth of the body 

 at the level of the genital pore is 0.12. In one of these attenuated 

 forms the pharynx is 0.045 from the anterior end, length 0.045, 

 breadth 0.03. The breadth of the body at the pharynx is 0.07. 

 The testes are variable in shape, in some cases being distinctly 

 lobed. The rami of the intestine, on account of their opaque con- 

 tents, could be traced in a few cases to the posterior end of the 

 worm, where they appeared to unite, although the actual continua- 

 tion of the lumen from one to the other was not satisfactorily 

 demonstrated. In the best preparation, although the terminations 

 of the rami are contiguous, they did not appear to unite. The con- 

 tents of each ended abruptly a short distance from the point of 

 contact (fig. 6). Others removed from cysts, and more or less 

 degenerated, did not show the contents of the intestinal rami ap- 

 proaching as closely as in the case figured. Ova in the free form, 

 in the degenerate forms from cysts, and in cysts which contained 

 only ova, are essentially similar in form and size. 



On Jul}'^ 7, 1915, a loon {Gavia wimer) was examined. It had 

 been taken in a fish trap in Buzzard's Bay, and had been kept in 

 the pool of the United States Bureau of Fisheries for a week be- 

 fore it died. The bird was reported by Vinal N. Edwards to have 

 been " sick " when it was taken. The stomach and intestine were 

 empty. 



The pancreas was thickly peppered vv^ith dark brown cysts from 

 1 to 4 mm. in diameter, not of any uniform shape, but mostly 

 rounded or subangular. They occurred on the surface under the 

 serous coat, and also in the substance of the pancreas. The whole 

 pancreas was affected, but not uniformly. At the point where the 

 cysts were most abundant there were about 25 in a space 10 mm. 

 square. "Wlien crushed these cysts were found to be filled with 

 small ova. There was some variation in size but the dimensions 

 in sea water were about 0.028 by 0.014 in the two principal diameters. 

 It was noted that some of the ova had a cap at the smaller end. This 

 feature lias also been recognized in the mounted material. The 

 maximum dimensions of ova in balsam are about 0.024 by 0.013. 



