63 
NOTE ON A REMARKABLE PARASITE OF 
PLAICE AND FLOUNDERS. 
By H. M. Wooncocx, B.Se. (Lond.). 
In corresponding with Mr. Johnstone about the 
Glugea-infection of the plaice, above described, he in- 
formed me of what seemed to be another Myxosporidian 
infection of a flounder (Pleuronectes flesus), instances of 
which, he says, are not unfrequently met with. In 
looking up the literature on parasites of flat-fish, I came 
across the papers by Lowe (2), McIntosh (3), and Sande- 
man (4), which would appear to refer to the same thing. 
As Sandeman practically gives the substance of 
MeIntosh’s two papers, accompanied by figures, a brief 
abstract of his note “ On the Multiple Tumours in Plaice 
and Flounders ” will suffice. 
The tumours were prevalent more or less all the year 
round, occurring principally from May to November, and 
giving the fish an emaciated appearance. The situation 
of these cyst-like swellings was in the skin and dermal 
tissue of the fins, the operculum, and the tail, usually pro- 
jecting externally. Sandeman does not say whether the 
gut or other internal organs were aftected. The little 
swellings are described as pearly-white spheres, not firmly 
attached, but loose in the connective-tissue, covered over 
by the pigmented epithelium, and exuding on pressure a 
creamy-white, structureless substance. The larger masses 
form tumours up to nearly an inch in size, composed of 
many spheres from 1 to 15 mm. in diameter, often, how- 
ever cuboidal or polygonal owing to mutual pressure, and 
eacn limited by a distinct membrane. The author remarks 
on their great resemblance to a mass of eggs, but admits 
