63 
SECOND REPORT on the COPEPODA of 
LIVERPOOL BAY. 
By Isaac C. THompson, F.L.S., F.R.M.S. 
With Plates I. and II. 
[Read 12th November, 1887. ] 
SincE the last Report on the Marine Copepoda of the 
district, thirty-one additional species have been recorded, 
making fifty species altogether known to the district. 
Four of them are new to Britain, three of them being 
altogether new to science. ‘Two of the other species have 
not been before recorded in Britain for fifty and thirty 
years respectively. 
Some of the species noticed in the first Report as having 
been found locally or sparingly have since proved to be 
very common throughout the district. Of these may be 
mentioned Pseudocalanus elongatus, Dias longirenus and 
Oithona spinifrons. Calanus jinmarchicus then alluded 
to as not having been found nearer than the Isle of 
Man, was subsequently taken by tow-net, during the 
‘‘Weathercock” excursion, far out at sea, at about the 
centre of the L.M.B.C. area, and has since been taken 
off Puffin Island. | 
The establishment of the Biological Station on Puffin 
Island has greatly aided tow-netting operations, and many 
of the rarer forms obtained have been found in material 
forwarded therefrom. Mr. Rutherford, the curator, collects 
whenever the weather renders tow-netting operations 
practicable and forwards the material at once by post. 
On a recent occasion, during the early morning hours of 
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