[ i8 ° ] 
Thefe defcriptions may perhaps appear imperfeff, 
being confined merely to the figure and fubftance 
of the bodies, without any mention of the polypes 
that inhabited them. To account for this omilfion, 
it is neceflary to acquaint you, that they were drawn 
up a few years ago, with others of the like kind, 
at the requeft of Doftor Targioni Tozzetti of 
Florence, who defigned them for an appendix to a 
pofthumous work of Micheli’s, entituled, De Plantis 
Marinis. As the plan of this work was botanical, 
I therefore thought it neceflary to accommodate my 
defcriptions accordingly, though I was not inclined 
to his opinion about the origin of thefe bodies. Upon 
enquiry it appears, that the publication of Micheli’s 
work is very uncertain ; for which reafon I fend you 
the following defcriptions, requefting at the fame 
time, your communication of them to the gentlemen 
of the Royal Society, fhould you think they deferve 
their notice. It is hoped, that they will not prove 
altogether unacceptable, as the Zoologifls, in their 
defcriptions of the Polypes, are fometimes apt to pafs 
over too flightly the figure and ftrudture of the parts 
in which they refide. 
DESCRIPTIONS S. 
i. Spongia ftuppea, tuberofa et calamifera, ca- 
lamis cylindraceo-conoideis, in cefpitem connatis, om- 
nibus aflurgentibus, quorum nonnulli majores in 
apice, calicis in modum, pyxidati vifuntur, bafi bi- 
fida et trifida, binis vel tribus columellis inftruCta;, 
calamis minoribus myofiroideis, five caudiculas muris 
formam pras fe ferentibus, et in rotunde acutum ter- 
minals. 
