of Sponces. 
ices between thofe Holes are filled with other minute ones ; 
 thefe have a regular roundifh Entrance to each, and feem to 
be compofed of {mall Bundles of minute tranfparent Fibres, 
that crofs one another, as if conftructed by fome Animal: 
 Thefe Fibres, or rather Spicuie, are fo extremely fine and 
- fharp, that they affect the Skin like Cow-itch. 
_ Fig, d, Plate XVI. is the natural Appearance of a Piece 
of this Sponge ; but in general itis found branched out. 
_ The fmall Piece, at Fig, d 1, is magnified to the Size of 
Fig. D x, to fhew the Manner in which the Bundles of mi-_ 
nute Spicule are laid, to form the {maller Holes that cover 
the Surfaces o 3 : 
Sr 
