SEA-FISHERIES LABORATORY. 193 



space between the egg capsule and the yolk. Variegated 

 Sole : A few specimens were found in a tow-netting from 

 the vicinity of Nelson Buoy, at the entrance to the 

 Ribble, on May 31st, and in another from Lune Deep, 

 about five miles south of Piel Gas Buoy, on May 14th. 

 Ling : 'The eggs of this fish were taken off Port Erin on 

 April 9th, and off New Quay Head on May 1st. Mackerel : 

 Large numbers of eggs belonging to this fish were found 

 in the plankton samples from various parts of Cardigan 

 Bay in June and July, off the entrance to the Bibble in 

 the latter half of June, along the North Wales coast 

 about the same time, and in the vicinity of Port Erin 

 on August 27th. A very extensive incursion of adult 

 mackerel took place during 1906. The fish were caught 

 in various parts of the Irish Sea, between New Quay and 

 the Duddon, from the beginning of June right on to the 

 end of September. Two species of ecto-parasites of fishes 

 were taken for the first time in the Irish Sea in 1906. 



Caligus zei, Norman and T. Scott. Plate I. 



Several specimens of this species were found attached 

 to the skin of a " John Dory " captured in the trawl of 

 the " John Fell," while fishing off New Quay Head, on 

 June 16th. The only other known specimens of this 

 species are in Dr. Norman's collection, and were taken 

 on a " John Dory " captured off the coast of Cornwall 

 forty years ago. The female represented by the drawing 

 on the plate measured 6 mm. in length. 



Lernaeenicus encrasicoli (Turton). Plate II, figs. 6-9, 



A large catch of sprats were taken off Blackpool on 



February 19th, by the fisheries steamer, and a few 



hundred of these fish were landed at Piel. A careful 



examination of the fish was made, and one sprat with 



o 



