[ 6 37 ] 
Polypus entirely to draw in its lips within its body, 
and at other times even to detach itfeif entirely from 
its pedicle alfo. 
Another way to take off the celerity of this mo- 
tion, is to remove the infeds into a water which 
furnifhes them much more fparingly with food 5 
fading probably weakens them, and from their weak- 
nefs arifes an abatement in the quicknefs of their 
motions. Th s lad expedient is of u re and conve- 
nieney for the obferving of this motion whilft it is 
flower, for feveral days confecutively. And after- 
wards upon returning the Polypi into water docked 
with food for them, the motion will foon he re- 
dored to its former brisknefs. 
I remarked alfo the lad winter, that cold deadened 
the motion of the cludering Polypi : and thefe ani- 
mals in all probability are lefs voracious, and eat 
lefs in winter than they do in fummer. 
When the motion in the cludering Polypi has 
been retarded, either by fading or by the cold, they 
become whiter or of a paler colour than before, 
they alfo then ceafe to multiply. 
I fhall not here enter into the detail of the feve- 
ral obfcrvations I have made, on the feeding of 
thefe cludering Polypi , and on the relation I have 
found between that and their generation 5 as thefe 
are particulars more properly belonging to a regular 
and didind account of their natural hidory. 
But what I now propofe, is to defcribe, in a few 
words, the manner in which the cluders are formed 
of a certain fpecies of Polypij which multiply in the 
main like thofe reprefented in the figures of the 
474th number of the Philofophical Tranfaftions, 
and 
