Of the frejh Water Pohpe., 20 $ 
a young one, but remain’d in the fame ftate above three 
months. This polype had two young ones, which pro¬ 
ceeded one from g the returned part, and the other from 
f, the portion not returned. 
Thefe cbfervations are fufficient to fhcw the nature 
of a polype that is partly turn’d • back again, and the 
different revolutions made in thefe animals, are Teen in 
the figures 406, 408, 409, 410, and 411. which repre- 
fent the fame polype, and the return’d part always a c, 
and that part not returned a b. 
Thefe changes are not exactly the fame in all polypes, 
but vary confiderafely, feldom any two of a great num¬ 
ber being perfectly alike. 
The polype reprefented by fig. 417. was turn’d, and 
the following day returned part of its head, as at fig. 
407. which feven days after was formed into three heads, 
as at fig. 417. a b, {hews the tail of the polype, which 
remain'd turned, a d c g e, the portion turn’d back 2- 
gain fo considerably changed as to form three heads 
d g e. 
Fig. 418. exhibits the fame polype fourteen days older, 
ab the portion which remain’d turn’d, aden geo, the 
portion turn’d back again, ad, n g, n e, its three heads 
and necks ; -marked d, g, e, in the foregoing figure. 
Fig. 419. is the fame polype thirteen days after it was 
in the ftate of fig. 418. The portion oc of fig. 418. is 
parted from o to c, and the two portions, b a c d o, and 
engeo, fig. 419. are only faftened to each other by a 
thread o, ab, is the turned portion, a c and o c two porr 
tions, which in the preceeding figure are re-united, and 
marked oc, ad, n g, n e, and are the three heads with 
necks, and are marked by the fame letters, fig. 418. 
The two portions held by the thread o, fig. 419. are 
feen as they were feparated in fig. 420^ and 421. a h, fig. 
420. 
