bd 
the present we have four species of Protozoa, ten species 
of Vermes (Trematodes) and forty-six species of Crustacea 
(Copepoda). 
The Protozoan parasites are found on and in various 
parts of the fish, such as the brain, the intestines, and the 
skin. In a few instances the presence of these parasites 
is easily recognised, but in the majority, careful dissection 
and examination of the tissues is required before they can 
be detected. The most noteworthy appearance of the 
presence of Protozoan parasites that has come under our 
notice is the one on the skin of the ordinary “ white fluke,” 
Pleuronectes flesus. It usually takes the form of small 
white globular bodies attached to the skin of the body and 
fins. Ina specimen recently secured, the upper and lower 
lips of the mouth were thickly covered with the cysts, 
which doubtless interfered with the fish securing food. 
The gills were also much infested. Occasionally larger 
masses, sometimes the size of a marble, may be present. 
This disease in the white fluke has attracted considerable 
attention for many years, and is, no doubt, the origin of 
the theory long held by fishermen that white flukes carried 
their eggs attached te their body. We have a species of 
Glugea recorded from the plaice, a Sporozoan from the 
flounder, which is probably a new genus, also Glugea 
fophii and another new form, Spherospora platessa, which 
infests the auditory capsule of the plaice. The two new 
species will be discussed in another section of this Report, 
in special papers by Mr. Woodcock. , 
The Trematode parasites may be found attached to 
the gills, or skin, and, in the case of one species, even in 
the Cloaca. Occasionally more than one species may be 
found attached to the gills of a single fish. These para- 
sites are of various sizes, and usually colourless, except as 
regards their excretory and reproductive systems. The 
