/ 
TREMULOUS HOLOTHURIA. 
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Generic Character. 
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Body unfixed, naked, gibbous, with an open ex¬ 
tremity. 
Tcntacula numerous, furrounding one extremity. 
Mouth fi mated amidft the tcntacula. 
Specific Character. 
HOLOTHURIA with numerous conical papillae 
on its upper furfacc, cylindric ones on its 
lower, and numerous fafcieular tcntacula fur¬ 
rounding the mouth. 
So Orange and variable arc the fliapes of fevcral 
marine animals belonging to the tribe Mollufca, 
that it is difficult to give a clear idea of their form 
by any description; fincc like the animalcule known 
by the name of Proteus, (Chaos Proteus. Lin.) 
they are capable of totally altering their appearance, 
and alTuming an afpc<fi: widely different from that 
in which they appeared a few minutes before. This 
is no where more remarkable than in the genus Ho- 
lothuria, and the fpccics here figured may Hand as 
a curious example of this mutable power. When 
perfectly 
