128 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Glugece — but contented himself with remarking that the 

 cysts scarcely ever exceeded 1 mm. in diameter. Taking 

 into consideration, however, the agreement in size and the 

 very similar habitat and appearance of the parasites in the 

 two cases, there is every probability that those in the 

 plaice also belonged to this species. 



About the same time Linton (4) published his syste- 

 matic researches on fish parasites. Under Pseudopleuro- 

 nectes americanus, the winter flounder, is a note (p. 485) 

 concerning two small specimens infected with cysts. The 

 gut-walls of one throughout almost the entire length, and 

 of the other for a short distance, were entirely covered 

 with " sporocysts " {i.e. seen from the outer or coelomic 

 side). The cysts were irregular in shape where crowded 

 together, and where not — which was in but few places — 

 they were elliptical or spherical. Their size varied, but 

 none much exceeded 1 mm. in diameter. Fig. 1 is re- 

 produced from Linton's fig. 4, PI. 1, and shews the 

 general appearance of a portion of the intestine wall. 

 Compared with Johnstone's fig. 1, PL D., the similarity of 

 the two is readily apparent, allowance being made for the 

 difference in magnification. Linton's figure, however, 

 does not shew the areas or regions which are observable 

 in Johnstone's specimen. The spores were oblong-ovate, 

 about '003 mm, (3/a) in length by "0015 mm. (lfo) in 

 width, and these agree very well with the dimensions I 

 have found, both for those from Johnstone's plaice and 

 from my own. In short, I am quite confident that this 

 specimen of Pseudopleuronectes was also infected with 

 Glugea stephani, 



From another Pleuronectid, Rhombus (Stromateus) 

 triacanthus, the butter-fish, Linton further describes (p. 

 455) a " sporocyst " occurring in the liver, white and 

 globular, and about 1'5 mm. in diameter. When com- 



