Part III. Of Animal Bodies fetr iff d. 261 
of this is diffokible with Spirit of Nitre : of a Ihining black- 
i(h colour, thin, and as it were the fhell of the far greater 
part within it. This alfo is very gloffy, and tranfparent as 
Giafs. Of a brittle fubftance, breaking into fquare flakes, 
like thofe of a flaky Spar. Yet no Acid will ftir it. 
The HARD CORNU AMMONIS. 'Tis a perfed: 
whitifh and pellucid Flint. Thefe Stones are found in 
Qermany. 
Note, that if one of thefe Stones be broken, the feveral 
Rounds will part fo, as the ridges of one, and the anfwer- 
able furrows 'of the other, are apparent. 
Like wife, that in fome of them, there is not only a ridge, 
but a round part about as thick as the biggeft firing of a 
Tenor Viol, winding round between two Circumvolutions, 
as the Medulla Spinalis runs widiin the Back-Bone. 
The Helick SERPENT-STONE.^/;//^ AmmoneusScc the 
Defcription hereof in Wormius, with the Title of Lapis Sce- 
leton Serpe?itinum ferens. 'Tis of kin to the Cornu Ammonis 5 
wrought all over with Stride, imitating the Scales of a Ser- 
pent. In fome parts of This, rather the jagged Leaves 
of a Plant. Of a pale Okre colour, but fomewhat hard, 
and dirToluble only with Nitrous Spirits. 
ANOTHER, which in the room of Scales or Leaves, is 
wrought all over, and as it were joynted, with futures in 
the form of an / obliquely waved from the rim towards 
the centre. Which Articulations are not only on the Sur- 
face, but, as Wormius well notes, in its intimate parts. This 
is of a dark amber colour, and fomewhat hard 5 yet maketh 
an Effervefcence with Spirit of Nitre. 
The HELICK MARCASITE. Marcafita Ammonea. So 
I name it, for that it hath the fame Figure with the Cor?m 
Ammonis, and to the hrft of thefe in Boetius, is next a kin, 
if not the fame. Yet appears to be a fort of Mar c a fit e or 
Gold colour'd Fire-Stone 5 both by its Weight, and Cop- 
peras Taft. And fome of them are cover d with Vitriolick 
Flowers. Amhrofinus (a) figures two of thefe under the e<OMuf.Me- 
Title of Cryfammonites : not fo properly, as not having a taI1, Aldrov - 
grain of Gold in them. 
The HELICK MARCHASITE,having fhallow Furrows 
on the Rim. 
ANOTHER, with fome alfo channelled. 
A 
