OF ARTS AND SCIENCES. 25 



There is in Flounders a most active circulation going directly 

 from the heart to the orbits and back again : this is well sliown in 

 this figure by the direction of the arrows along the vessels leading 

 towards the orbits and back again to the heart. 

 Fig. 11. Is a young Plagusia, after the transfer of the eye, nearly three inches 

 long, showing even at this stage but a slight accumulation of pig- 

 ment spots along the dorsal and anal fins parallel to the line of the 

 spines. A few yellowish and black pigment spots have also ac- 

 cumulated on the left side, but the young fish has as yet lost but 

 little of its transparency. 



What eventually becomes of this species I am not able to say, 

 and it is not improbable that this species is .identical with that 

 described by Steenstrup, and it may also be the young of the 

 Plagusia found on the Atlantic coast of the Southern States. 



