[,° 6 ] 
Three different parts, unlike each other, compofe 
this animal 3 viz. the feet, (Fig. F. o , /,) a trough, 
(Fjg. F. g y H. t ,) and an head, (Fig. G. n.) Each 
foot begins by two conical appendices (Fig. H. o , o, o , 
Fig. 1. o,). By the union of thefe appendices a 
rounded part is formed, which, in fome degree, re- 
fembles the belly of a mulcle, (Fig. H. i. Fig. x) 
by means of which the foot is fhortened and length- 
ened. To this part (Fig. I. x ,) is annexed a little 
cylinder, (Fig. I. n , Fig. H. c,) the length of which 
is indeterminate. 
Thefe feet are ranged all around in great num- 
ber, and annexed to the iamince , (Fig- F. a , a y 
c , c ,) and are all united to the trough, (Fig. H. c,) 
on the outfide of which are feen ten cavities, with 
an equal number of prominences (Fig. H. t, t , /, .r, .r, r,) 
and in thefe is lodged the animal’s head (Fig. G.) 
which has prickly rays, the precife number of which 
I could not determine, on account of the extreme 
velocity of the continual olcillatory motion of the 
head from right to left, and from left to right : yet I 
thought I could perceive the number of thefe rays to 
be eight : and the ufe of them may be for the ani- 
mal to catch and hold its food. This part is not al- 
ways to be obferved, becaufe it fometimes hides itfelf, 
by clofing up the trough (Fig. H. s, s, t , r,) about it ; 
and, by thus covering itfelf, it is fafe in its habitation. 
As the figure of this animal bears no refemblance 
to the urtica marina , I cannot fee, how one could 
clafs the pslypus of the madrepora with the urtica. 
This animal is extremely tender, and generally 
tranfparent, and very beautiful for its variety of co- 
lours. I have obferved it in fpring and autumn in 
the 
