18 



Gloucestershire. Plott's engraving is copied by Lister ; and Lhwydd, 

 n. 971, as well as Morton, p. 233, both describe this fossil. 



It is of this fossil that Dr. Plott informs us, Hist, of Oxfordshire, p. 91, 

 that the centre of these rays being never placed on the top of the stone, 

 but always inclining to one side, as that at the bottom does to the other, 

 the axis lying obliquely to the horizon of the stone, gave occasion to a 

 learned society of virtuosi, that during the late usurpation lived obscurely 

 at Tangley, by consent, to term it the polar stone ; since, by clap- 

 ping two of them together, they made up a globe, with meridians 

 descending to the horizon, and the pole elevated, very nearly corre- 

 sponding to the real elevation of the pole of the place where the stones 

 are found. 



The Cl. hemisphtfricus, Lesk. Tab. XLIII. Fig. i. taken from Lang. 

 p. 119, does not appear to belong to this section; even Cl. quinquela- 

 biatus, Lesk. Tab. XLI, Fig. 3, taken from Walch, PI. E. in. Fig. 4, 

 is in such a state as will hardly allow of determining its real species. CL 

 Conoideus, Lesk. Tab. XLIII. Fig. 3, appears to be a rare petrifaction, and 

 but little known. It seems, however, to agree in every respect with 

 Echinus magnus, Aldrov. Mus. Met. p. 456. 



