Xll 



INFERIOR OOLITE AMMONITES. 

 II. Angustumbilicate (pachygyral) — Brodieia. 



A. Septicarinate ? carinati-sulcate. 

 A. Bectiradiate. 



Am. comensis, Haver, PI. xi, figs. 1, 2. 



Am. Bayani, Dumortier. 



Am. comensis, Meneghini, PL vii, figs. 2, 3, two species. 



Am. comensis, Meneghini, PL xii, fig. 1. 



Brodieia juncta, sp. n. 



B. Subflexiradiate. 



Am. comensis, Meneghini, PL vii, fig. 1. 

 Am. comensis, Hauer, PL xi, figs. 4, 5. 



B. Non-septicarinate (periphery not bisulcate). 

 A. Non-tub erculate, platygyral. 

 IncerTjE sedis, This Monogr., PL xii, figs. 35, 36, = Brodieia curva. 



B. Tuberculate, stenogyral. 



Am. Escheri, Dumortier. 



Ludwigia sp., This Monogr., PL xxiii, figs. 9, 10, = Brodieia (?) 



"WlTCHELLI. 



From the foregoing grouping it will be seen that there are several distinct 

 genetic series to be dealt with. But as the series is obviously very incomplete, 

 the application of generic names must be for the present somewhat arbitrary. 



Geological Bouillon. — The bulk of the species of the Lillia-Haugia series mark 

 a very definite portion of geological time. The following table will show this : 



Hemerse. 



Palftontological phenomena. 



Geological phenomena in the Cotteswolds. 



Striatuli 

 Variabilis 

 Lilli 

 Bifrontis 



Qrammoceras striatulum dominant. 



Non-tuberculate species like Eseri. 

 Platygyral forms like Haugiajugosa. 



Stenogyral forms like Lilli. Lepto- 



gyral forms allied to Hild. bifrons. 

 Hildoceras bifrons in its prime. 



Ironshot limestone, base of Cephalo- 



pod-bed. 

 Upper part of Cotteswold sands. 



Lower part of Cotteswold sands. 



So-called Upper Lias clay. 



