DORSET-SOMERSET DISTRICT. 53 
The upper beds at Woolston, Shotwell, and Grove contain a scattering of 
Brachiopoda including Rhynch. spinosa, and in the two latter there is a distinct 
Terebratula-bed chiefly made up of a variety of T. globata. These beds then 
would seem to prefigure the Clypews-grit ; and on this horizon, if anywhere in the 
Dorset-Somerset District, specimens of Nerina, which has hitherto failed the 
collector, should be sought. 
Pircoms Roap.—Two and a half miles east by north of Castle Cary. This is 
the last exposure in No. 1 District of beds containing any noteworthy quantity of 
Gasteropoda. It is a small roadside section. Reposing directly upon soft 
yellow sand-rock, believed to form part of the “ Yeovil Sands,” is (1) a calcareous 
or subcalcareous bed with shells, fourteen inches thick ; (2) a rich shell-bed with 
many Cephalopoda and some Gasteropoda, thirty inches thick; and (3) pale- 
coloured limestones, of which three or four feet are exposed in the road cutting. 
After the experiences of Grove and Woolston this is certainly a surprise, since this 
*fossil-bed”’ is clearly not in the Parkinsoni-zone. The prevailing Ammonites 
are keeled, and may be on the horizon of those in the Sowerbyi-bed at Bradford 
Abbas. Perhaps we may obtain further evidence. 
Résumé of the North-eastern half of the Dorset-Somerset District. 
One very striking feature is the difficulty of predicating for any given neigh- 
bourhood on what horizon the main fossil-bed shall lie. All the zones, except 
perhaps the opalinus-zone, are well represented, and teem with most beautifully 
preserved Gasteropoda, some in one place and some in another. ‘Consequently 
this has for years been the favourite hunting-ground of collectors. A very con- 
siderable proportion of the Gasteropoda selected for description in the accompany- 
ing Memoir are from this division of No. 1 District, and they are on the whole in 
by far the best state of preservation. Compared with these the Gasteropoda of 
the remaining districts are disappointing. 
Border region of the Mendips. 
If we allow, for purposes of delimitation, that the prolongation of the Mendip 
axis shall be considered to divide District No. 1 from District No. 2, yet there is 
a considerable portion of the Inferior Oolite outcrop on both sides of this axis 
which contains no shell-beds with Gasteropoda, and with which we need not 
trouble ourselves. The country from Bruton to Radstock, a distance of twelve 
miles if measured in an air-line, but more if we trace the edge of the outcrop in 
the neighbourhood of Frome, will be comprised in this border region. ‘This 
presents many features of interest to the physical geologist, containing in some 
