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THE WATER CABINET. 137 
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and for a length of time, that proves them to be by no 
means subject to giddiness. 
The species of Gyrinus are not numerous in Britain, 
not more than eight being known to naturalists; but the 
paucity of species is compensated by the profuseness of 
the individuals, and of these natator is the most abundant. 
GYRINUS NATATOR. 
When placed under a lens, this beetle bears the form 
represented in the next page. The colour is blue-black, 
with a resplendent metallic lustre, in which shades 
of copper, silver, and bronze occur, as we view it at 
various angles to the rays of light. The thorax is marked 
with three transverse lines on each side, of which the 
