FISHES 



22. Trout. Salmo trutta, Linn. 



Generally distributed in running waters, and 

 found even in small brooks. The American 

 charr, Salmo fontinalis, Mitchell, has been in- 

 troduced near Guildford. 



23. Herring. Clupea harengus, Linn. 



Young specimens occur in the tidal part of 

 the Thames. Dr. Giinther has shown that 

 the ' whitebait ' eaten in London between 

 April and July consist mainly of young her- 

 rings. 



24. Shad. Clupea alasa, Linn. 



25. Thwait. Clupea Jinta, Cuv. 



This and the preceding species enter rivers 

 in the spring, and a few have been found in 

 the Thames as far as Hampton Court. 



APODES 



26. Eel. Anguilla vulgarity Turt. 



CYCLOSTOMES 



27. Lampern. 

 In rivers. 



Petromyzon fluviatilis, Linn. 



28. Mud Lamprey. 

 Linn. 



Petromyzon branchialis. 



In rivers and brooks. 



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