DORSET-SOMERSET DISTRICT. 45 
that he saw in some collections fossils from his own fossil-bed at Bradford Abbas 
marked “ Lias.” Now, if we regard the ‘ Marnes Infra-oélithiques”” of Hugtne 
Deslongchamps as forming a portion of the Lias, then the concavus- or Sowerbyi- 
bed of Bradford Abbas will fall into that category ; but in this case the greater part 
of the Inferior Oolite in England will have to be relegated to the Lias, a proposition 
which must not be entertained for a moment. At the same time it cannot be too 
often insisted on that our Sowerbyi-bed forms no portion of the Oolite of Bayeux. 
It distinctly belongs to the Lower Division of the Inferior Oolite, and constitutes its 
highest member. Hence we shall find that the Gasteropoda differ considerably 
from those of the Bayeux Oolite, and that is one reason why so many species 
hitherto unknown are found there. It follows from this that Dr. Wright was 
equally mistaken when, rushing from one extreme to the other, he afterwards 
placed the Bradford Abbas fossil-bed in the Humphriesianus-zone (‘ Quart. Journ. 
Geol. Soc.,’ vol xv). 
Amongst the Gasteropoda of the “ fossil-bed”’ there are several species of 
Purpurina, some decidedly new. Spinigera is well represented, and that too by 
some new and curious forms. The species of Alaria are not without resemblance 
to those described by Schlumberger from the Hast of France. As regards 
Cerithium, the prevailing species in the beds of Bayeux are here represented by 
related rather than by identical forms, whilst the rarer and less widely distributed 
species would appear to be altogether different. Much the same may be said with 
regard to the other genera, and if we seek for a complete antithesis in England, it 
may be sought in the almost equally rich shell-bed (P,) at Burton Bradstock, 
which contains extremely few species identical with those of the bed now under 
consideration. The exact equivalents of the ‘“Sowerbyi-bed,” as known in North 
Dorset, are by no means clear in the Cotteswolds, nor, for the matter of that, in 
any other part of England, so far as I am at present aware. 
The two thin beds which succeed in the quarry are of but little interest for us. 
The “ rotten-bed,”? which is so full of Astarte obliqua, may possibly be an attenuated 
representative of the Hwmphriesianus-zone. In point of thickness more than half 
the quarry belongs to the Parkinsoni-zone. Here we would fain institute a 
comparison with the same zone as developed at Burton Bradstock. The condi- 
tions are different, however, and we can hardly see in the marl-bed with T. Morieri 
the exact equivalents of P,. Nevertheless, both here and in the white limestone 
above, the species of Gasteropoda which do occur are mostly identical with those 
noted from the same horizon on the coast. 
Harrway-Hovse Quarry is rather nearer to Bradford Abbas than to Sherborne, 
and to some extent partakes of its nature and characteristics. I do not know of 
many Gasteropoda having been obtained from here. The usual grey calciferous 
grit called the “* Dew-bed” forms the base, and above this occur some four feet of 
