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[WORK FROM THE PORT ERIN BIOLOGICAL STATION. | 
REVISED REPORT on the COPEPODA of 
LIVERPOOL BAY. 
By Isaac C. THompson, F.L.S., F.R.M.S. 
With Plates XV to XXXV. 
[Read February 10th, 1893.] 
THREE previous Reports have been issued upon the 
Copepoda of the L.M.B.C. District, the last being in the 
year 1889. Since that time so many species new to the 
district have been found that it was thought advisable to 
draw up a complete Report of all the species recorded in 
the district up to the present time. 
Previous to the work of the L.M.B.C., commenced in 
1885, very little in this group had been done, six species 
only of marine Copepoda having been recorded in our 
area. The present Report deals with 136 species of which 
18 are new to British seas, 11 of them being new to 
science. ‘Those new to British seas are as follows :—- 
Labidocera acutum, Dana, Hucheta marina, Prestan- 
drea, Guiardella callianasse, Canu, Monstrilla dane, 
Claparede, Monstrilla rigida, ‘Thompson, Sabelliphilus 
sarsit, Claparede, and Artotrogus orbicularis, Boeck. 
Those new to science are :— 
Herdmama stylifera, Cyclops marinus, Hersiliodes pu- 
fim, Jonesiella hyene, Amevra attenuata, Stenhelva denti- 
culata, Stenhelia hirsuta, Monstrilla longicorms, Laop- 
honte spinosa, Cletodes monensis, and Lichomolqus maximus. 
The total number 136 species are divided amongst the 
various families as follows: Calanidze 13 species, Pon- 
tellidee 4, Misophride 3, Cyclopide 7, Notodelphide 7, 
Harpacticide 72, Monstrillide 4, Sapphirimidee 11, Arto- 
