493 
TABLE I. 
ALPHABETICAL INDEX OF THE INFERIOR OOLITE GASTEROPODA, 
WITH A TABLE OF DISTRIBUTION ACCORDING TO DISTRICTS. 
NOTE. 
1.—As a rule no species are quoted in this Index unless based on specimens which have been 
seen by myself: Nerineea consobrina, Witchell, is perhaps the only exception. Forms provisionally 
named in the Monograph are not listed: exception, Merinzea sub-brevivoluta. 
2.—Practically there are five districts: viz. (1) The Yorkshire Basin, Lower Division, including 
the Dogger and Millepore Bed; Upper Division, the Scarborough Limestone. (2) The East Midland 
District is not at present divided into a Lower and Upper Division; it embraces the Northampton 
Sand and Lincolnshire Limestone. (3) The Cotteswold District includes the Inferior Oolite outerop 
from the neighbourhood of Banbury (Hook Norton) to the Mendip axis. The Lower Division comprises 
the Opalinus- and Murchisonx-zones, including the Pea-grit, Oolite-marl, and the Freestones. It is 
probable also that the Gryphite-grit and Lower Trigonia-grit should come in here. The Upper 
Division includes the Upper Zrigonia-grit and Olypeus-grit with their equivalents, lying for the most 
part in the Parkinsoni-zone. (4) The Dundry exposure is regarded as a district by itself, not at 
present divided. (5) The Dorset-Somerset District extends from the Mendip axis to the Channel at 
Burton Bradstock. The Zower Division includes the Yeovil Sands, together with the Opalinus-zone, 
Murchisonee-zone, and Concavus-bed (in the early part of this Monograph called the Sowerbyi-bed). 
The Upper Division includes the Sauzei-bed, which is much more nearly on the Sowerdyi-horizon, the 
_ Humphriesianus-zone generally, and the Parkinsoni-zone. 
3.—In the columns a “note of interrogation” (?) in some cases signifies that the identification is 
questioned, in others that the locality is in doubt. In those cases where an Upper and a Lower 
Division are adopted, the query may relate to the Division only. With respect to the East Midland 
District there is considerable difference between the Fauna of the Lower Division of the Lincolnshire 
Limestone, as exemplified by the extremely fossiliferous horizon at Lincoln, and the Fauna of the 
Upper Division, as exemplified by the beds at Weldon and Pontcn; but since some fossiliferous 
localities are doubtful it has been thought best not to attempt to distinguish an Upper and Lower 
Division. 
