TO GEOLOGY. 171 
slightly canaliculate above ; mouth subovate, rather nar- 
row ; columella with four folds, curved ; outer lip sharp. 
Length .... Breadth .5, of an inch. 
Observations. At first view this species might be mis- 
taken for the above. Its curved columella and more re- 
flected lip, however, serve readily to distinguish it. The 
striz on the superior part of the whorls are stronger than 
on the body. Having but a single specimen, the apex of 
which is removed, the description is somewhat defective. 
Three species* only of Mitra have been observed in 
England and those are all from Barton Cliff, London Clay 
Formation, having been described by Mr Sowerby in his 
Mineral Conchology. M. Deshayes gives sixty-six species, 
in his Tables, from the Tertiary. Twenty-four are from the 
Paris basin alone, and thirteen from the Subappennines. 
No fossil species have, I believe, been before observed in 
our Formations. 
GENUS VOLUTA. Linneus. 
V. Defrancii.t Plate 6. Fig. 179. 
Description. Shell turbinate, transversely striate, coro- 
* Fleming (British Animals, p. 333,) makes a fourth, by adding the 
Voluta Lamberti to his list of Mitre. The genus must be considered to 
be very badly defined, for Mr Conrad places this species among the 
Fasciolarie, (Journal of the Acad. Nat. Sci. vol. 6, p. 216.) Ishould 
certainly agree with Mr Sowerby, and keep it with the Volute. 
+ Named after the distinguished fossil conchologist M. Defrance. 
