122 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Psetta maxima, Linn. — Turbot. 

 The eggs of this fish were also taken twice in the plankton 

 collected by the steamer in 1913. Six were found in the 

 collection taken ten miles N.N.W. from Piel Gas Buoy on 

 June 2nd. Three occurred in a sample collected near the 

 Causeway Buoy in Cardigan Bay on June 4th. 



Zeugopterus punctatus, Bl. — Muller's Top-knot. 



The pelagic eggs of a top-knot which were identified as 

 belonging to the above fish were found in plankton collected 

 in Bed Wharf Bay on May 29th, June 5th, and June 11th. 

 They were also present in Tremadoc Bay on July 22nd. That 

 sample contained 12 specimens. The three samples from Ked 

 Wharf Bay only contained four top-knot eggs altogether. 



Lepidorhombus megastoma, Donov. — Megrim. 



The eggs of the megrim or sail fluke appeared to be 

 generally distributed in the Irish Sea from Point Lynus to 

 the vicinity of Bahama Bank, and shorewards as far as Nelson 

 Buoy, in April and May. The maximum spawning period was 

 probably about the last fortnight in April. A collection of 

 plankton, taken nineteen miles N.W. by W. from Morecambe 

 Bay Light Vessel on April 17th, contained four hundred and 

 ninety-six megrim eggs. Another sample, from twenty-four 

 miles W.N.W. from Piel Gas Buoy on May 5th, had three 

 hundred eggs of this fish. 



Pleuronectes platessa, Linn. — Plaice. 



The pelagic eggs of this important food fish, although 

 generally distributed in the Irish Sea between Lancashire and 

 the Isle of Man from the beginning of February to the middle 

 of April, were very scarce. They occurred in nineteen samples 

 taken during the period mentioned, but the average number 

 of eggs present was only about 3 per sample. The eggs were 

 observed for the first time in four tow-nettings taken on 



