64 
that it would be impossible for any animal to force such a 
quantity under the skin, as to give rise to a pedunculated 
tumour. (Since, as I shall presently shew, they also 
occur in the mesentery, this possibility is entirely nega- 
tived). In none, though he noticed them all the year 
round, could he discern any development. 
Sandeman apparently only examined the cysts under 
a low power, and judging from his description and figures, 
I thought it very probable that this was another case of 
a Glugea-infection. There is considerable resemblance 
between his fig. 3 (a section through a tumour of many 
cysts), and Johnstone’s fig. 2 (l.¢c., above), for example. 
In order to identify it, Johnstone kindly forwarded me a 
well-infected flounder from the Fisheries Museum collec- 
tion in the University of Liverpool, together with a 
drawing of the head-region, shewn in fig. 1. On see- 
tioning the parasites, I soon realised they were very 
different from what I expected to find them. 
The specimen was taken in the Barrow Channel in 
January, 1901, Both sides of the head are plentifully 
averaging 14-1) mm. 
covered with opaque white cysts 
in diameter—some spherical, others more ovoid. On the 
dorsal side, just in front of the fin, are two or three con- 
tiguous tumour-like masses—not, strictly speaking, 
tumours, however, for there is, practically speaking, no 
proliferated tissue, the whole thing being a mass of cysts 
with, of course, a little vascular connective-tissue between 
and around them. Solitary ones are also scattered about 
on the operculum, ventral fin, and tail, and they shew a 
tendency to aggregate along the lateral line, especially 
posteriorly. Under the pectoral fins an Entomostracean 
eetoparasite (Lepeophtheirus) is fairly abundant, but there 
is no connection between the two kinds of parasite. 
The cysts lie beneath the skin (on the upper side 
