[ 82 ] . 
the feelers more ufeful to the animal, in filling up 
the interfaces between them, through which fmaller 
infers elfe might pafs, without being perceived by 
the animal, whofe natural food they are. 
This polype feems to live at the bottom of the fea, 
diftant from the land. I met but once with it upon 
the fhore, between Penzance and Newland, where 
it was thrown up by the fea, inclofed in a large hollow 
root of the fucus palmatus. 
The third fpecies, is the 
Hydra difciflora, tentaculis retradlilibus fubdia- 
phanis ; corpore cylindrico, miliaribus glandulis 
longitudinaliter flriato. 
A polype of this fort is reprefented in the fourth 
figure. Its body, when extended, is of a cylindrical 
figure, and conflantly marked with fome rows of 
fmall knots, or glandular, that are placed in ftrait 
lines from the top to the bafis of this cylindrical 
ftalk. Each row is compofed of three files of glan- 
dular, of which the middle one is remarkably bigger 
than the two others; their number is uncertain, yet 
I never met with lefs than eight rows in an animal 
grown to its full age. The colour of the ftalk near 
its bafis is a pale red, and the reft is of a yellow, 
mixed with a grey afh-colour. The glandular are 
almoft of the fame colour with the body, except 
thofe of the middle file of each row, which I con- 
flantly found to be white. Out of the top part, or 
the difk of the polype, grow the feelers, from eighteen 
to thirty-fix in number ; they are of a half-tranfparent 
fubflance, and of a whitifh colour, variegated only 
at the upper part of the feeler, like the back of 
fome 
