P A t. III. Of Anijnal Bodies ptrifyd. 
261 
of this is diffoluble with Spirit of Nitre : of a fhining black- 
ifh colour, thin, and as it were the (hell of the far greater 
part within it. This alfo is very glofly, and tranfparent as 
Glafs. 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 perfect 
whitifh and pellucid Flint. Thefe Stones are found in 
Germany. 
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. 
Likewife, 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 within the Back-Bone. 
The Helick SERPENT-STONE.#/>/>/><?s AmmoneusScc the 
Defcription hereof in Wormius, with the Title of Lapis Sce- 
leton Serpent inum ferens. 'Tis of kin to the Cornu Ammonk 5 
wrought all over with Stria, 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 diffoluble 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 $ 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 Comu 
Ammorivs, and to the firft of thefe in Boetius, is next a kin, 
if not the fame. Yet appears to be a fort of Marcafite or 
Gold coloured Fire-Stone 5 both by its Weight, and Cop- 
peras Taft. And fome of them are coverd with Vitriolick 
Flowers. Ambrofinus {a) figures two of thefe under the o*)Muf.Me 
Title of Cryfanmonites : not fo properly, as not having a tal1, Aldrov 
grain of Gold in them. 
The HELICK MARCHASITE,having lhallow Furrows 
on the Rim. 
ANOTHER, with fome alfo channell'd. 
A 
