InfeB with Tijh-like 'Fins . 365 
was furnifhed like them with fix flender 
Legs. Immediately below this Part, the 
Body leffened, and was connected together 
by feven Articulations, the Part between 
each Joint fpreading wider at the lower 
than at the upper End. They appeared all 
together like the Spinal Vertebras $ and from 
the Procefs of each Joint iffued a Pair of 
Fins, making feven Pair, or fourteen in 
the whole. Three other Joints below the 
Fins terminated the Tail, the End whereof 
was ornamented with three long and very 
elegant Bridles, befet on every Side with 
fhort Hairs, and appearing like Plumes of 
Feathers. The whole Animal was of a faint 
green Colour, except the Fins, which were 
as tranfparent as CryflaL Under each Fin 
flood out a fmall Spine j ferving either to 
fupport the Fin, or as a Weapon of Defence. 
Its Motion in the Water was extremely 
fwift, darting itfelf along at a furprizing 
Rate : with one Stroke only of its Fins it 
would fwim acrofs a Glafs Jar it was kept 
in; but out ' of the Water it creeped as 
Land Infedts ufually do. Its Legs were never 
employed whilfl in the Water, and on the 
Land it makes no Ufe at all of its Fins. 
This Animal is in its Nympha State, out 
of which it changes into a fmall Species of 
the Libella *. 
* N a vii. of this Plate was defcribed page 321. 
CHAP, 
