34 GASTEROPODA OF THE INFERIOR OOLITE. 
might say here, whilst dealing with this subject, that, although the term “ Bajocian ” 
as applied by D’Orbigny was in the main confined to the “beds of Bayeux,” it 
has since been so generally applied to the whole Inferior Oolite that we might 
well call the ‘‘ horizon of Bayeux” Upper Bajocian and all the rest Lower Bajocian. 
At any rate this would sound better than “ Upper Inferior Oolite” and ‘‘ Lower 
Inferior Oolite.” Still it is not strictly accurate, and martinets might grumble: 
we had best restrict ourselves to Upper Division and Lower Division. 
Purpurina bellona, D’Orb., a somewhat elongate variety, is not uncommon in 
this bed, and Onustus ornatissimus, D’Orb., is also characteristic. Both these genera 
are represented by very different species in the “ fossil-bed”’ of Bradford Abbas. 
Purpurina bianor, D’Orb., and varieties or allied species, are also characteristic ; 
and Purpurina inflata, Tawney, likewise occurs. <Alaria hamus, Desl., and Alaria 
Lorieri, D’Orb., or forms very near them, are fairly plentiful. On the whole, 
perhaps, the Normandy fossils are better represented in this bed than in any other, 
though in some respects the two Gasteropod horizons at Oborne may be still richer 
in forms identical or representative of those across the Channel. 
P,. This might be called the Terebratula-bed, from the abundance of what I take 
to be small varieties of 7. spheroidalis ; Terebratula Phillipsit and Waldheimia 
carinata are also characteristic, or at any rate fossils that pass for such species. 
Conical forms of Plewrotomaria occur, and the specimens of Am. Parkinsoni are 
very large. Belemnites are very abundant. Holectypus, a small rounded species, 
is tolerably abundant. There are Gasteropoda here too, but not in sufficient 
numbers to call for any special notice. This shell-bed occurs about the base of 
the second limestone block, and within a very short distance vertically from P,. 
Though well separated in the cliff section it is just possible that in some of the 
quarries hereabouts the two may coalesce. 
P,. A somewhat greater width of oolitic limestone separates this, the topmost 
bed of the Parkinsoni-zone, from the shell-bed last before detailed ; it is about five 
inches thick and contains a narrow species of Belemnite in considerable abundance. 
Am. Parkinsoni is rare but Am. subradiatus is decidedly plentiful, and there occurs 
a very thin Ammonite just at the top, which perhaps, may be regarded as a variety 
of Am. subradiatus. Serpule and Placunopsis are adherent. Monomyaria are very 
abundant, especially Lima pectiniformis and L. duplicata. Many Myacids may be 
noted, and the little round Holectypus (2 H. depressus) is to be found in great 
numbers. Very few Gasteropoda were noted. Upon the surface at the top the 
small Ostree and other shells of the Fuller’s Harth above are adherent. 
