t 40 ] 
FIG, XLYIII. 
Volutions three, their fides round!fh. 
Formed in a trochus or top {hell. The fliel! 
(as may be feen by an impreifion taken in the 
hollow made by the fhell which is deftroyed)' 
had the ridges of the fpires rifing into blunt 
diftin6l tubercles, with intermediate Jirios. 
Found in a lime-ftone quarry. 
FIG XLIX. 
Volutions four, their fides flat. 
This was formed in a trochus with a perforat¬ 
ed bafe : the fhell was flriated, parallel with the 
volutions. 
Found in a free-ftone quarry. 
F I G. L. 
Somewhat deprefled: three inches in diame¬ 
ter : volutions four, their fides flatifli: bafe 
perforated. 
Found in a free-ftone quarry. 
\ 
FIG. 
