225 
one-eighth of an inch in diameter, from which they taper, in regular 
gradation, to a point; the tentacula consist of many articulations. 
The main stem seen in this mass is of a circular form, somewhat hollow 
within, having the edges rounded off, and a small hole in the centre. 
There were several fragments of branched madrepores, and striated shells 
of the anomia genus, also imbedded in the stone.” 
From Dudley, in Worcestershire. 
LETTER XXII. 
THE TORTOISE ENCRINITE....THE STRAIGHT ENCRINITE-.-TIIE BOTTLE 
ENCRINITE THE CLOVE ENCRINITE KENTUCKY ASTERIAL 
FOSSIL. ...UNCOMMON ENCRINAL VERTEBRiE.... FOSSIL, APPARENT- 
LY AN OVAL ENCRINITE. 
T'he first mention which I find made of any part of the extraordinary 
fossil, which, from the disposition of the plates of which it is formed, 
may be termed the Tortoise Encrinite, and whose nature I shall 
now attempt to investigate, is in Mr. Lister's paper on the Radices 
Entrochorum,* already noticed. He there gives an engraving of one of 
the plates of this animal, which he describes only as “ a pentagonous 
plate embossed with angles.” 
One of these plates, from the chalk-pits in Kent, is exhibited, Plate 
XIII. Fig. 30, adhering to its chalky matrix. A considerable degree 
of variety is observable in the markings on these scales ; those which 
are seen on the scale here figured, showing, from their extreme irregu- 
* Philosophical Transactions, No. 100, February, 1674. 
VOL. II. 
G G 
