260 Of Ammd Bodies 'fHrijyd. Par t III. 
yet feen any Jhell The top is blunt, and of a middle height. 
Encompafied with five double pricked Rows, all meeting 
in the fore part of the Belly. The fpaces betwixt which, 
are cancellated much after the manner of the Sea-Tortoife- 
fhell. Tis a perfect Flint, brown without , and whitifli 
within. 
ANOTHER of the fame fort , with bigger pointed 
Rows. 
A THIRD, of the fame Figure, but foft,/r. of a kind of 
Limy fubftance, or that of Gypfum. 
The SHARP CONICK HELMET-STONE. Tis a 
Semipellucid Flint. Surrounded with five double pointed 
Rows, meeting not only on the top, but alfo at the centre 
of theBafe or Belly. Bejler figures a fmall Co?nck. Helmet, 
by the name of Echinites : a great one, by that of Scolo- 
fenJrites. And feveral Species hereof are alfo figur d by Al- 
£). MuC Me- drovandus. {a) None of the flinty or other hard Helmet 
Stones make any ebullition with Acids. 
The HELIX or Stone Nautilus 5 as from its Figure it 
may not improperly be nam'd. Comu Ammonis^ From 
Jupiter Ammon , pictur d with Horns. Here are feveral 
of them, both in fize, fhape, and fubftance diftincl:. I 
find no Author defcribing them much broader than the 
ball of a mans hand. The higher!: Boetius reckons, about 
three pounds in weight. But in this Mufaum there is one 
near two yards in circumference , and proportionably 
thick. Of an A(h-colour,and fomewhat gritty fubftance.The 
feveral Rounds,as it were,carved with oblique waves. Given 
by the Right Honourable Henry Duke of Norfolk, With, 
ANOTHER GREAT CORNU AMMONIS almoft 
as big, fc . about five feet round about. 
A SMALL CORNU AMMONIS, of an allien colour, 
and foftilh fubftance: yet diffoluble only with Nitrous 
Acids. It maketh but one or two Rounds 3 ratably, far 
more fwelling, than in the other kinds. 
ANOTHER, of a foft and whitilh fubftance 5 diffoluble 
in any Acid, and confifting of feveral Rounds. 
A THIRD, growing upon a Stone of a like fubftance. 
Figur d in Calceolarias Mufaum, and that of Olearius 5 in 
both under the Name of a Petrify d Serpent. 
The CASED CORNU AMMONIS. The outer part 
\r of 
