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TABLE I. 



ALPHABETICAL INDEX OF THE INFERIOR OOLITE GASTEROPODA, 

 WITH A TABLE OF DISTEIBUTION ACCOEDING TO DISTRICTS. 



NOTE. 



1. — As a rule no species are quoted in this Index unless based on specimens wMch have been 

 seen by myself: Nerinsea consohrina, "Witchell, is perhaps the only exception. Forms provisionally 

 named in the Monograph are not listed : exception, Nerinxa sub-hrevivoluta. 



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 outcrop 

 from the neighbourhood of Banbury (Hook Norton) to the Mendip axis. The Lower Division comprises 

 the Opalinus- and Murchisonse-zones, including the Pea-grit, Oolite-marl, and the Freestones. It is 

 probable also that the Gryphite-grit and Lower Trigonia-gTit should come in here. The Upper 

 Division includes the Upper Trigonia-grit and Clypeiis-gv'xt with their equivalents, lying for the most 

 part in the ParMnsoni-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 Lower Division includes the Teovil Sands, together with the Opalinus-zone, 

 Murchisonse-zone, and Concavus-}iedi (in the early part of this Monograph called the Sowerlyi-hedi') . 

 The Upper Division includes the ^SaM^^ei-bed, which is much more nearly on the /SotwerSj/j-horizon, the 

 Huviphriesianus-zonQ generally, and the Farkinsoni-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 Ponton ; but since some fossiliferous 

 localities are doubtful it has been thought best not to attempt to distinguish an Upper and Lower 

 Division. 



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