258 Zoology. 



Leuciscus phoxinus, Linn. Minnow. Thames and Ravensbourne,. 

 common. 



Tinea vulgaris, Cuvier. Tench. Common in all the streams. 

 Abramis brama, Cuvier. Bream. Thames and Ravensbourne. 



Alburnus lucidus, Heckel and Kner. Bleak. Common in th& 

 Thames. 



Nemachilus barbatulus, Linn. Loach. Common in the Ravens- 

 bourne. 



SALMONIDJE. 



Salmo salar, Linn. Salmon. Formerly found rarely in the Thames. 

 The last record, 1833 (Yarrell.) 



Salmo fario, Linn. Trout. Formerly in Thames and Ravens- 

 bourne. 



Osmerus eperlanus, Linn. Smelt. Formerly in the Thames. 



ESOCJDJE. 

 Esox lucius, Linn. Pike. Thames and Ravensbourne, common. 



ACIPENSERID.E. 



Acipenser sturio, Linn. Sturgeon. Formerly rarely taken. 



PETROMYZIDJE. 



Petromyzon marinus, Linn. Lamprey. Occasionally many years 

 ago. 



Petromyzon fluviatilus, Linn. Lampern. Formerly abundant in the 

 Thames. 



PART VI. 



ARACHNIDA (Spiders). 



PSEUDOSCORPIONES (False Scorpions). 



H. WALLIS KEW. 



These animals Arachnids of the order Pseudoscorpiones 

 have not been fully studied in this country, and they are not very 

 generally known. They are readily recognised, however, by their 

 great chelate palps, which resemble those of a true scorpion and 

 recall in some measure the great ' ' claws " of a crab or lobster. 

 About twenty species inhabit Britain ; and of these, by very slightly 



