the title of Clufter-Polypes; many of the fpecies 
being found in groupes; fometimes formed by the 
mere approximation of feveral individuals; and at 
other times by the ramified or aggregate manner in 
which they grow. 
The Vorticellse are generally found in clear ftag- 
nant waters, during the fummer months ; attached 
to the ftalks of the fmaller water-plants; and par¬ 
ticularly to thofe of the common Lemna or duck¬ 
weed. The fpecies however here reprefented is a 
marine one, and is attached in a fimilar manner to 
the ftalks of the fmaller Fuci. To the naked eye 
the whole groupe bears the appearance of a very 
fmall whitifh fpot or flime, refembling mouldinefs; 
but when placed in a drop of water on a glafs, and 
examined by the microfcope, its extraordinary 
ltructure is immediately difplayed. From a Angle 
Item proceed, at various heights, fmaller ramifica¬ 
tions, each terminated by a feeming flower, like 
that of Convolvulus, and furnifhed on the oppofite 
edges with a pair of filaments refembling ftamina. 
The whole is in the higheft degree tranfparent, and 
perfectly refembles the fineft glafs ; while the vary¬ 
ing motions of the feeming flowers, expanding and 
contrafling occafionally, and turning themfelves in 
different directions, afford a fcene fo Angularly 
curious that it may be numbered amongft the moll 
pleafing fpeclacles which the microfcope is capable 
of exhibiting. Each animal, though feated on the 
common ftem, is to be conAdered as complete in 
itfelf, and poffefles the power, when fully grown, 
of detaching itfelf from the parent ftem, affixing 
itfelf 
