I 
[ 35 1 
ter; where there is a 'coriic hollow three eights 
of an inch deep. 
Fio. B. Is part of a BeUmnite lodged in free- 
ftone. The conic cavity was filled with the 
fame ftone, which is divided into many round 
jointsTiG, that are at one fide concave; the 
other convex;. 
The following attempt to account for the ori¬ 
gin and the formation of the extraneous foflil 
commonly called the Bdemnite, is taken from 
the Philofophical tranfaBions Vol. LIV, being , 
part of a paper by Mr. Jofhua Plott. 
The Belemnite belongs to the teftaceous part 
of the animal kingdom, and to the family of the 
Nditiili, The fiphiinculiis is always upon the 
verge of the chamber, or cell; and in the fi- 
phunculus is a little gut or duQus, proceeding 
from the body of the animal, by dilating or 
contrafling of which the animal, it fhould feem, 
may go out or into its cell at pleafure. This is 
the only flay, which the animal has to fecure its 
retreat: nor does-the gut or duflus pafs through 
all the cells to the end of the fpiral cone, either in 
this lliell or the Nautilus: For the ends of the fpi¬ 
ral cone of concamerated fliells are (hut up in the 
famq 
