CORNISH FAUNA. 
CORNISH ZOOPHYTES. 
SUB CLASS I. 
RA DIA TE D ZOOPHYTE S. 
Body contractile in every part, symmetrical; mouth and 
^'tsone; gemmiparous and oviparous. 
ORDER I. 
HYDIl OIDA. 
. This, the first order of Zoovhytes, is very commonly dis- 
puted on all parts of our coast from the tide marks to 
^'d-channel; and the individual species are of such delicate 
P elegant shapes, as seem peculiarly fitted to invite 
Mention and study. The outward forms vary from a single 
pn to the bushvappearance of the Ostrich feather or the 
pirrel’s tail ; and the examination of their minute structure 
P economy shows an equal variation which adds greatly to 
Pleasure of their study. The arrangement followed iu 
essay, is based on the character of the animal or polype 
* s in some measure independent of the form and caaracter 
' ll ‘e hard parts or polypidom. Its character is : “ Polypes 
r^Pound, rarely single and naked , the mouth encircled with 
filiform tentacula ; stomach without proper parietes : 
e e **ine none ; anus none; reproductive gemmules pullulating 
/P the body, and naked or contained in external vesicles, 
t^yptdonis horny, ftstular ; more or less phytoidal , fixed, ex- 
When the polypidom is present, it. is always 
to i nal and horny ; but there are several species belonging 
0 f U "Inch have none; and these are ealled Naked Hydruida. 
l,j,i naked species, which inhabit fresh water, I have 
“ er >o found none in Cornwall; though probably a more 
bcP'ud search may be successful, as the Hydra viridis lias 
11 lowd in Devon by Turton. 
rJ l ' v,i s on these naked creatures that Trembly made his 
la tkahle experiments, by which it was proved that they 
A 
