Al 
Eudactylina acanthi, A. Seott. 
Of frequent occurrence on the gills of the picked 
dog-fish. | Van Beneden records Mudactylina acuta from 
the angel-fish and the picked dog-fish, but we have never 
seen it on the latter. he present species is very distinet 
from 1. acuta. Another species, 4. semelis, VT. Scott, from 
the gills of Rava radiata, and a fourth from the gills of 
Trygon are known, but, so far, have not been met with 
in the Ivish Sea. 
Lernecnicus spratte (Sowerby). 
Anchored in the eyes of the sprat, Clupea sprattus ; 
not very common, but one or two specimens are 
frequently found in each catch of sprats. Usually only 
one specimen is found on a fish; occasionally two, one 
on each eye. We once met with a sprat that had two 
parasites in one eye and one in the other. The parasite 
measures 18 millimetres in length without the long egg 
sacs, but when these are added the length may reach to 
one and three-fourth inches. 
Lernecnicus musteli, van Beneden. 
On the gill rakers of the smooth-hound, Squalus 
mustelus. It is a large species, but does not appear to be 
a COMMON one. 
Lernea branchialis, Linn. 
This well-known and easily recognised parasite 1s 
moderately common on the gills of various members of 
the Gadide. The cyclops stage is often abundant on the 
extremities of the gills of plaice and flounder, and the 
next stage is occasionally taken in tow-net collections. An 
account of this curious form, and the changes that take 
place before it reaches maturity, have already been given 
in the Fisheries’ Laboratory Report for 1900. 
