When in perfed quiet and compofure it firfl: puts forth thefe fentacula • they 
appear in a more regular form, as at B. But as foon as they begin to move round 
in the water, they are bended and unfolded, as a mod beautiful waving foliage, 
and afiume the fine feathered appearance of C. 
The feelers d d are alfo retradtile, and curioufiy formed, as magnified at D. 
The apertures through which they ftretch themfelves are tuberculated round; and 
apparently Ihut when the feeler is retraced. But the province they fill, in admi- 
ruftering to the comfort and exiftence of the animal, is a difcuffion not to be ven- 
tured on in the limits of this article. 
