124 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Pleuronectes flesus, Linn. — Flounder. 



Flounder eggs were recognised for the first time in the 

 plankton collected in the Irish Sea in 1913, five miles W. by S. 

 from Selker Light Vessel on February 18th. They were generally 

 distributed in the northern area of the Irish Sea from the date 

 mentioned to the middle of April. The numbers present in the 

 samples of plankton were never very large, and only exceeded 

 one hundred on three occasions. A collection taken twenty-two 

 miles W.N.W. from Piel Gas Buoy on March 3rd, contained 

 one hundred and twenty. Another sample, from half-way 

 between the " Hole " and Bahama Bank on March 18th, 

 contained four hundred and eighty. The third time the hundred 

 was exceeded was in a sample taken nineteen miles N.W. by W. 

 from Morecambe Bay Light Vessel on April 17th, when two 

 hundred and eighty-eight flounder eggs were found. 



Pleuronectes microcephalus, Donov. — Lemon Sole. 



Pelagic eggs which were identified as those of lemon sole 

 were found in plankton collected nine miles S. of South Stack 

 on April 4th. They occurred again five miles N.W. by N. 

 from Peel, Isle of Man, on May 7th. Collections taken in Red 

 Wharf Bay on May 15th, 20th, and 29th, and again on June 5th, 

 contained an average of thirty-one lemon sole eggs each. 

 Plankton collected six miles N. from Great Orme's Head on 

 May 29th contained forty-two eggs of this fish. Lemon sole 

 eggs were not observed after June 5th. 



Pleuronectes cynoglossus, Linn. — Witch. 

 The pelagic eggs of the witch were only found on one 

 occasion in 1913. Fifteen were present in a sample of plankton 

 collected five miles N.W. by N. from Peel, Isle of Man, on 

 May 7th. The adult fish are found in fair quantities West of 

 the Isle of Man and off Calf Island, but they are not often 

 met with between the Isle of Man and Lancashire. 



