PERCID^E. 13 



is found in Switzerland, Germany, France, and England, but said to be absent 

 from Spain, Portugal, Italy aud Greece. 



Tn the British Isles it is common in the Severn, Cam, Thames, and the rivers 

 and canals of the midland counties of England, especially where the bottom is of 

 fine sand or gravel. It is not found in Devonshire, Cornwall, or the Isle of 

 Wight. It is generally considered to be absent from Scotland, but Edward in 

 1877 observed " one is said to have been obtained off Troup Head, about forty- 

 two years ago." It is absent from Ireland. 



This fish was first noticed by Belonius who named and figured it : next 

 Dr. John Caius took it in the River Yare near Norwich and sent a drawing to 

 Gesner, termed Aspredo, "rough," which was published. 



It rarely exceeds 7 inches in length. I am indebted for the example figured, 

 natural size, to Professor Smidt of Archangel. 



