tid The Statural Hiflory 
of other formed ftones J with fidls in all parts anfwerable. 
107. Ihty x^dztxX'imk thtCornua Ammonk^ or Ophiomorphttes^ 
to have been formerly nothing but Porcellane-JIjells^ feem alfo to 
be preffed with the like dijficulties : for either there are feveral 
forts of them not known to (I am furenotdefcribed by) Authors, 
or elfe our Hones muft have their formation from a different mold 
than their For firft, ihtfiells feem to be extravagantly 
broad at the mouth, as defcribed by Rondeletm and Jonfion^ and 
not to have more than two other fmall turns at moll ; whereas the 
turns of the Ophiomorf hit's are proportionable to one another, 
and in number many times four or five, and fomtimes fix, if we 
may believe Aldrovandu6^ : Of which difference Chioccm^ feems 
to have been fo well aware in his defcription of the latter part of 
the Mufaum Calceolarium^ that he makes the Cornu Ammonps and 
Nautilus la f idem to be quite different things, and defcribes the 
latter very broad at the greater end, and with but one turn^ fom- 
whatlike indeed to the Porcelljne-fielL 
108. Befide, fo far are fome of our Eng\ii}\ Opbiomorphit^ s 
from ever having been formed by the JIkU the Nautilui^ that 
at Huntley-Nab in the North-riding of Tork-fiire^ they are found 
always included in other great round Jlones^ not unlike, fays Mr. 
Cambden % to Cannon bullets. And at Whitby^ fays Mr. Ray \ in 
ftones of a lenticular j^gure^ which if formerly they had been the 
fjells of Nautili^ how they fliould become thus included in Jlones 
alfo of z determinate figure^ is a difficulty more infuperable than 
any of the former. Add hereunto that Mr. Cambden \ and fince 
him Dr. Childrey plainly avouch, that the OpMomorphit's of Cain^ 
fham^ have fome of them heads^ and that in this they differ from 
thofe of Tork-fiire : Vidimus enim lapidem hinc delatum ferpentk in 
fpiram revoluti effigie^ cujus caput in circumferentia prominuit^ extrema 
Cauda centrum occupante^ are the very words of Mr. Cambden.' 
Which if I find true when I come into Somerfet-Jhire^ will gwtme^ 
and I doubt not, o/^er^ fatisfaftion beyond all exception; for 
that xht jhells of the Nautili have any fuch matter, no body yet 
has, nor will dare to pretend. 
109. To which alfo add the ^re<j/;7f/? of fome of thefe ftones^ 
whereof there are fome it feems near two ^ foot in diameter^ far 
^ MufxinnMetalluum-^ lib.i^.cap.x. y Mufeum Cakeo/arium, fe^. ■T^.p. ^i6- " Carnhdenin Tork-Jhire. 
■a Topograph. Objtrvat. p. 11^. b r.ambden in Somerjet-fhire' « Britannia Baconica in Somerjet-fhire. 
* Dr. Merret's Pimx rerum natura I. pag. 215.* 
ex- 
