64, 
Natural Hiftory —_ | 
ture, and the whole Subftance of it, feels as light as 
Cork. ihe ns Sataeend zy : | 
The outward Surface is compofed of a mealy friable Mat- 
‘ter of the Colour of red Lead, not unlike the Covering of 
the common ied Coral, as it is brought to us, when firft 
taken out of the Sea, but: fuller of little Rarry Holes. The | | 
Matter that compofes the Gells which lies immediately under 
this, has fome Degree of Tenacity, and the internal Part is 
. {till more compaét, and contfifts of a faint red {pongy Sub- 
ftance. 
The Surface of the principal Stems a farrounded by pa- 
rallel Tubes: Thefe Tubes we may trace up along the 
Branches, till they change infenfibly into Rows of Cells, as 
we may obferve in fome of the celliferous Corallines. 
Fig. P, Plate XXVI. is a Reprefentation of a {mall Piece 
_ of this fpongy Keratophyton, in its natural Proportion. 
Fig. Q, is a Piece of the Top of one of the Branches, cut 
perpendicularly through the Middle, to fhew the Situation 
of the Cells. Thefe Rows of Cells furround,the young 
Branches on all Sides; and the fpongy Parts between them 
appear in the Microfcope to be full of irregular tubular ‘Ca- 
vities. : 
The internal fpongy Part of this Species is more intimately 
united to the cellular cortical Part, than in any other Species 
we have yet feen. 
Fig. R, is the horizontal Se&tion ofthe fame Branch, to 
fhew the Difpofition of the feveral Rows of Cells, furround- 
ing the {pongy central Part. Poser ah ae 
I have obferved, in fome Specimens of the pennated Kera- 
rophyton, or Sea-Feather, that, when the Whole, or Part of 
. 3 ae tobe it, 
