[ §4 ] 
I only fnention this fpecies, to determine its fpeci- 
fical character, which has not yet been given by any 
of the authors, that have already taken notice of this 
animal *. The colour of its body is always red in 
the fummer, but changes into a dufky green, or 
brown, towards the latter end of autumn. The out* 
tide of it is quite fmooth, fome few animals of this 
fort excepted, which are marked, like the firft fpecies 
of this clafs, with fmall protuberances, to which fe- 
veral extraneous bodies likewife adhere. The feelers 
are conftantly inferted into the difk of the polype, 
but they are of various colours, viz. red, blue, white, 
and fometimes even variegated. Between thefe feelers 
and the membranaceous cover of the animal, is a 
row of fmall hemifpherical tubercula, which, though 
they vary in colour as much as the feelers, yet are 
conftantly found to be placed upon the edge or peri- 
phery of the difk, and confequently afford, together 
with the infertion of the feelers, a certain mark, by 
which this animal, fo variable in its colour and fhape, 
may be at all times known and diftinguifhed from 
any other fort belonging to this tribe. 
This is what occurred to me, oh the figure and 
external parts of thefe animals. I could add a defcrip- 
tion of their internal ftrudture, and fome obfervations 
on the manner of their propagation ; but, as I have 
already tranfgrefied the limits of a letter, I fhall defer 
* Bellon. de Aquat. lib. ii. p. 342. Rondelet. de Fife, 
lib. xvii. cap. 12 et 14. Gefner. Hift. Anim. p. 1037. &c. 
Aldrov. de Zoophyt. lib. iv. p. 567. Johnft. Exang. Tab. XVIII. 
De Reaumur, lib. c. Tab. X. fig. 22. 24. 
enlarging 
