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i 
REVISED REPORT ON L.M.B.C. COPHPODA. 177 
there as well as several rare ones not taken in any other 
part of the district. Indeed it seems probable that it is 
from dredged material in such localities that we must look 
chiefly for additions to our microscopical fauna, the free 
swimming forms of our district beimg more completely 
tabulated. 
Experience further leads me to the opinion that small 
isolated tracts, probably local depressions in a muddy or 
sandy bottom are particularly rich in Copepoda, apparently 
similar material taken from near such local centres having 
at the same time proved most unpyrolific or nearly alto- 
gether destitute of life. The rock pools at Hilbre Island 
as well as those of Puffin Island have proved valuable 
hunting grounds worked with a fine hand townet. 
The parasitic species in the Report found in the bran- 
chial sacs of Ascidians have all been sent to me by Prof. 
Herdman. To him also and to his “‘ Fisheries Laboratory”’ 
Assistant Mr. P. J. F. Corbin I am indebted for a large 
number though hitherto not a great variety, of fish 
parasites. The recent establishment of this Fisheries 
Laboratory gives promise of much valuable opportunity 
for the study of this important and rather neglected 
branch of our Copepodan fauna. Many of the other fish 
parasites here recorded were collected by our lamented 
colleague Mr. Frank Archer, B.A., while staying at Bull 
Bay, Anglesey. 
A new form of Lichomolgus, L. agilis, has been recently 
described by Mr. Thomas Scott, F.L.8., of the Scottish 
Fishery Board, from specimens inhabiting the inside of 
Cockle shells. This species I have found in the water of 
all the fresh cockles examined and it is probably very 
common, although previously overlooked. I had, however, 
taken it two years ago ina night townetting off Puffin 
Island, and put it aside as a new form, but deferred any 
