FISH NOTES 207 



which swims horizontally, both eyes being on the 

 upper surface, which is coloured, the under surface 

 being white and eyeless. In the Double Turbot 

 this change has been arrested, and both sides have 

 remained coloured and covered with the spines 

 usually found on the upper surface only, the eyes 

 remaining almost in the normal position which they 

 occupy in a fish swimming, say, as a Bream, not both 

 on one side, as in the Sole. Such double flat fish, 

 though now and then met with, are decidedly rare. 

 They are known to swim vertically, and near the 

 surface, unlike other flat fishes, which keep to the 

 bottom." 



The Turbot referred to had a queer kind of notch 

 just "above" the head, and in this the so-called 

 travelling eye had remained, thus giving its owner, 

 when swimming " edgeways up," an opportunity to 

 see on either side of him. 



I have on several occasions since seen Double 

 Turbots, slightly varying in individuals; in one or 

 two the notch above the head was wanting, and the 

 " travelling " eye was somewhat nearer to the other. 

 In two instances the fish have been quite dark- 

 coloured on both sides except the head, which 

 remained white. It is interesting to note that in 



