[ 6 > ] 
as a Bone Found in the Mouth of the Porcupine 
Fife. 
Siliquafira , many Specimens of the Palates of 
various Kinds of Fife—Petrified Crabs, found in 
great Plenty in the Ifland of Malta. 
Zoolithl, petrified Parts of Land Animals. 
Among other Specimens are the Grinders of an 
Elephant, &c. In the Mines in Derbyjhire are 
found Petrifactions refembling the Feathers of 
Birds. 
Phytolithi, petrified Plants. Here are a Number 
of Pieces of Wood turned into Stone. Though this 
Kind of Petrifaction ftil 1 preferves the Appearance 
of the original Wood, it fo far acquires the Hard- 
nefs and Confiftency of Stone that it may be polife- 
ed like Jafper. 
Under this Title are many Specimens of Slates 
and Pebbles having on them the perfeCt Figure of 
Fern and other Leaves-, in fome of them the Plant 
is immerfed, but projects from others of the Stones. 
Thefe Kind of Slates and Pebbles are frequently 
found at the Top of Coal Mines. Some of the 
Mines in Somerfetjhire have the Vein covered by 
a brittle kind of foft Slate, which they call there 
Wark ; It is eafily feparable into thin Plates, and, 
when divided, there is found on one of the Plates a 
protuberant Refemblance of a Fern Leaf. 
At Stamfop in Staffordjhire are frequently found 
Stones in the Form of Vegetables of various Kinds * 
and fome have the exaCt Figure of different Sorts 
of Fruit, as Pears, &V. and many of them refemble 
the Stone of an Almond. 
Graptolithi , figured Slates. They are a foft Kind 
of Marble, and have by Nature delineated on them 
very lively Reprefentations of Shrubs, Trees, Land- 
fcapes, Ruins, and are found in great Quantities 
in 
