502 MR. M. ODLING ON THE [Oct. I913,. 



It is to be noticed that such forms as Dictyotliyris coarctata,. 

 Zeilleria dir/ona, and Eudesia cardium have only been recorded 

 from Islip, 1 while Apiocrinus parJcinsoni has been recorded from 

 one of the clay-bands at Kirtlington, ? Oxford Portland-Cement 

 Works, 2 but from which is uncertain ; probably it came from one 

 of the bands in the Great Oolite, Block 1. Although A. parJcinsoni 

 has usually beeu considered a Bradford-Clay fossil, Prof. Reynolds 

 & Dr. Yaughan have shown that the Bradford-Clay fauna occurs 

 at several horizons in the upper part of the Great Oolite ; 3 and so- 

 there is no justification for assuming from the occurrence of this- 

 form the presence of a definite horizon. 



Great Oolite. 



The fauna of the Great Oolite (as defined in this paper) includes- 

 about ninety species. In addition, nineteen species have been re- 

 corded from the lower beds ; but these probably came from the beds- 

 here classed as Fullonian. 



In the Great Oolite, when subdivided, we find that Block 1 is 

 chiefly characterized by Nerincea eudesii, while in Block 2 JS T . funi- 

 culus is the more characteristic fossil ; Ctypeus mulleri only occurs 

 in the lower part of Block 2, and has not been found in the upper 

 beds : that is, not above the Nerincp.a Rock. 



Block 3 is nowhere exposed, except in the Ardley section, where 

 it will soon be obscured by the downwash of the clays ; it is 

 characteristically unfossiliferous, except for a few very badly pre- 

 served fossils. 



Fullonian. 



Palaeontologically, in this district the Fullonian is best con- 

 sidered as being composed (1) of an upper series, including all the 

 beds down to the top of the Stonesfield Slates; (2) the Stonesfield 

 Slates ; and (3) a lower series, consisting of the Neseran Beds and 

 the Chipping-Norton Limestone. The upper series contains forty- 

 five species, while the Stonesfield Slates contain 194 species, and 

 the JNeseran Beds contain forty-eight: since some of the species- 

 occur in more than one division, the total fauna of the Fullonian 

 amounts to 245 species. Of this total ten are restricted to the 

 upper beds, 133 to the Stonesfield Slates, and eighteen to the lower 

 beds of the district. 



On reviewing the assemblage of fossils from the Bathonian rocks 

 of the district, we find that of the 370 species recorded, 224 are 

 restricted in range ; of these no less than 133 are restricted to the 

 Stonesfield Slates, and thirty-four to the Cornbrash. Of the 370, 



1 J. F. Wlriteaves, ' Invertebrate Fauna of the Lower Oolites of Oxfordshire ' 

 Hep. Brit. Assoc. 1860 (Oxford) Trans. Sect. p. 107 ; and H. B. Woodward, 

 ' Jurassic Rocks of Britain' Mem. Geol. Surv. vol. iv (1894) p. 376. 



2 Id. ibid. p. 375. 



3 S. H. Reynolds & A. Vaughan, Q. J. G. S. vol. lviii (1902) p. 742. 



