498 CLASS ECHINODERMATA. 
ling on all its surface, with small tentacula. Some carry 
heir eggs at the bottom of this body. (Tubularia coryna, 
Gm. &c.) 
CRISTATELLA, 
Have in the mouth a double range of numerous tentacula, 
curved into a half-moon, forming a sort of plume of this figure, 
and attracting by their regular motion, the nutritive molecules. 
These mouths are supported upon short necks attached to a 
common gelatinous body, which moves like that of the hydre. 
These animals are found in our dormant waters. To the 
naked eye they appear like small mouldy spots. (Cristatella 
mucedo, Cuv.) 
VORTICELLA, 
Have a fixed stem, often branched, and very much divided, 
each branch of which terminates by a body, in the form of a 
trumpet, or a bell. We behold issue from the aperture, in two 
opposite groups, some filaments, which maintain a continual 
motion, and attract the nutritive molecules. ‘The species are 
numerous in our seas, and the majority too small to be well 
distinguished but by the microscope. They form bushes, 
arbuscula, plumes, and take other shapes, all very agreeable. 
PEDICELLARIA 
Are found between the spines of the echini, and are con- 
sidered by divers authors, as organs of these animals. Never- 
theless, it is more probable that they are polypi, which choose 
these parts as their asylum. A long slender stem terminates 
by a cornet, furnished at its extremity with tentacula, some- 
times in the form of filaments, sometimes in that of leaves. 
