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rounded by five double points or feet, in the figure of crescents, and 
having on their top the impression of a trochites, or a trochites itself 
yet adhering. He describes these stones as incrustate, from their being 
covered with rough polygonal plates, and says, “ I can compare the 
incrustation of these stones to nothing so well, as to the skins of the 
piscis triangularis^ thus described by Margravius : “ Cujus cutis (nam 
caret squamis) figuris trigonis, tetragonis pentagonis, hexagonisque 
mire distinguitur et notatur.” 
Mr. John Beaumont relates, in the Philosophical Transactions for the 
year 1676, that the bodies termed radices, by Mr. Lister, were to be 
found in the Mendip Hills, Gloucestershire, and says, “ Agricola com- 
pares these stones to a wheel ; and truly the body well resembles the nave 
of a cart or coach wheel, the shape of it being conical towards one 
end, till you come just to the top, where it is a little flat, with a hole 
in it ; and it has another hole in the middle of the broad end, oppo- 
site to this, very fit for an axis to pass through, and the five hollow 
stirts or feet, issuing sideways, at equal distances from the broad bot- 
tom, somewhat resembling spokes ; the said stirts standing about 
half an inch out from the body of the stone, so that it may not very 
improperly be called Modiolus quinque radiatus ; and at the ends of 
the stirts, where the hollows should show themselves, there grows, 
after a very artificial manner, a pretty large seam of the same stone, 
just over the middle of the hollow, from the upper part of the stirt 
to the lower part of it, parting the hollow in the middle, and cover- 
ing about a third part of it, not that this seam enters farther into the 
hollow than the mouth of it, so that the hollow of each stirt presents 
itself with two eyes. Hence, it appears that those stirts or feet were 
never longer than they are, and that no stone ever grew to them.” 
Mr. Lister says “ the feet were like crescents at the end, whereby 1 
tind the fore-seams of his stones were broken off, as two of them are 
in mine. The stone seems wrought all over like the fish mentioned 
by Mr. Lister, being composed of trigonal, tetragonal, pentagonal. 
