C 33 ] 
This is of free-ftone: it is fmall when compar¬ 
ed with one I have, which I am informed came 
from the ifland of Portland ; it is near thirteen 
inches in diameter, and near five inches thick, 
NAUTILI. 
Univalves ; whofe infide are divided into many re* 
gular and nearly equidijlant cells or chambers, the 
partitions of which are roundijh and with an even edge: 
in the center of the fpires is a pipe or fphunculus, that 
opens into, and commmicates from chamber to chain* 
her. The fpires never appear externally, hnt lie latent 
or quite hidden within the body of the Jhells, 
FIG. XLIV, 
Round: fmooth : a round mark in the center 
of each fide. Free Stone^ 
^ FIG. XLIV.« 
Oval: nine inches long; feven and a half 
broad; near five thick. Lime Stone: alfo of 
Free Stone., B. a feftion. 
Found 
