NOTOMMATA. 151 



tory organs are shaped like the figure eight, and 

 have bundles of bristles projecting beyond ; it 

 seems to have a small red eye. It is a lively 

 little creature, and extremely difficult to observe 

 with accuracy. 



Notommata longiseta (Drop IV. fig 4) is of a 

 very curious construction and appearance, and 

 easily known by its long double tail, which is 

 often more than three times the length of its body ; 

 the two portions are needle-shaped, one longer 

 than the other, and slightly curved : the body is 

 small and cylindrical, the rotatory organs nu- 

 merous, and not conspicuous. It is an active 

 creature, and has the power of leaping, or at least 

 changing its position suddenly, for I never ob- 

 served that this action gave it much onward 



