INFERIOR OOLITE AMMONITE-ZONES. 



161 



Rlmula clathrata, Sow. 

 Solarium (two new species). 



Emarginula tiicarinata, Sow. 

 Fissurella acuta, Besloiig. 



No. 21. The Pea-grit is one of the most remarkable beds of the Inferior Oolite in 

 the district. It invariably claims the most marked attention from all the continental 

 Oolitic Geologists to whom T have shown our local sections, as it is unlike any bed they 

 are acquainted with in France or Germany. Its upper part consists of — a. A hard, 

 coarse, brown, rubbly Oolite, full of flattened concretions, cemented together by a 

 calcareous matrix. When the blocks weather, the concretions resemble flattened peas, 

 and form an uneven surface. In the cavities of the Pisolite beautiful Echinidae are often 

 found in great perfection, and many other fossils are very well preserved therein. 

 j3. A hard, cream-coloured, pisolitic rock, made up of compressed, flattened concretions 

 like those of a ; the bed is more compact in parts, y. A coarse, brown, ferruginous 

 Ragstone, full of large oolitic grains and much ferric oxide ; it is readily disinteg- 

 rated by frost. The three beds measure from thirty to forty feet in thickness. The 

 Pea-grit varies considerably in development in difierent localities. Crickley, Leck- 

 hampton, Birdlip, and Cleeve Hills afford the best types of this bed. 



Harpoceras Murchisonse, Sow. 

 Nautilus truncatus. Sow. 



Cephalopoda. 



Belemnites spinatus, Quenst. 

 abbreviatus. Mill. 



Patella rugosa, Sow. 



— inornata, Xyc. 

 Piled us Isevis, Sow. 

 Nerita costata. Sow. 



Gasteropoda. 



Natica adducta, Phil. 

 Cirrus nodosus. Sow. 

 Turbo capitaneus, Miinst, 

 Trocbotoma carinata. Lye. 



Lamellibranchiata. 



Ostrea gregaria, Sow. 

 Placunopsis, sp. 

 Hinnites abjectus, Phil. 

 Mytilus imbricalus, Sow. 

 Lima sulcata, Miinst. 



— pectiniformis, Schloth. 



— duplicata, Gold/. 



— lyrata, Miinst. 



— Lycetti, Wright. 



Terebratula simplex. Buck. 

 — plicata, Buck. 



Astarte excavata, var.. Sow. 

 Myopsis rotundata, Buck. 

 Goniomya angulifera, Sow. 

 Avicula complicata, Buck. 

 Ceromya Bajociana, d'Oib. 

 Cardium striatulum, Phil. 

 — Isevigatum, Lye. 

 Pinna cuueata, Bean. 

 Pecten comatus, Miinst. 



Brachiopoda. 



Rhynchonella Lycetti, David. 



— subtetrabedra, Bavid. 



21 



