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 Manor, D'Orb., and varieties or allied species, are also characteristic ; 

 and Purpurina inflata, Tawney, likewise occurs. Alaria hamus, Desl., and Maria 

 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 3 . This might be called the Terebratula-bed, from the abundance of what I take 

 to be small varieties of T. sphceroidalis ; Terebratula Phillipsii and Waldheimia 

 carinata are also characteristic, or at any rate fossils that pass for such species. 

 Conical forms of Pleurotomaria 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 1# 

 Though well separated in the cliff section it is just possible that in some of the 

 quarries hereabouts the two may coalesce. 



P 3 . A somewhat greater width of oolitic limestone separates this, the topmost 

 bed of the ParJcinsoni-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. Serpulai and Placunopsis are adherent. Monomyaria are very 

 abundant, especially Lima pectiniformis and L. duplicate* . Many Myacids may be 

 noted, and the little round Eolectyjms {? E. depressus) is to be found in great 

 numbers. Very few Gasteropoda were noted. Upon the surface at the top the 

 small Ostreai and other shells of the Fullers Earth above are adherent. 



