NOTES ON THE BEITISH JURASSIC BRACHIOPODA. 27 



It is as follows : — 



Lower, Middle, and Upper Lias. 



Lower Oolites, including the Inferior Oolite,* Fuller's 

 earth, Stonesfield slate, Grreat Oolite, Bradford clay. 

 Forest marble, and Cornbrash. 

 Middle Oolites, including the Oxfordian and Corallian 



rocks. 

 Upper Oolites, including the Kimeridge c]b.j, Port- 

 land rocks, and Parbeck beds. 

 The zonal distribution of the Brachiopoda is a matter of 

 great importance, and must be studied in great detail before 

 we can ever hope to satisfactorily understand the evolution 

 of this group of animal life. 



In a general way I purpose adopting the classification of 

 the Brachiopoda proposed by Davidson, although here and 

 there it will be necessary to make certain modifications in 

 his system ^vhich recent advancement in our knowledge 

 would seem to require. 



BIBLIOGKAPHY. 



1. BucKMAN, S. 8, On the CotteswolJ, Midford, and Yeovil Sands, 



and the Division between Lias and Oolite. Q.J.G.S., 

 Aug., 1889. 



2. Some New Species of Brachiopoda from the Inferior 



Oolite of the Cotteswolds. Proc. Cottes, Field Club, 

 Vol. for 1886. 



3. and J. F. Walker, On the Spinose Ehynchonelke (Genus 



Acanthothyris, d'Orbigny) found in England. York. 

 Phil. Soc. Report, 1888. 



4. Crane, Agnes. Recent Observations on the Anatomy and De- 



velopment of the Brachiopoda. Natural Science, Vol. 

 I., No. 8, Oct. 1892. 



• Although paleeontologically incorrect to do so, I have, for con- 

 venience, included the whole of the Yeovil, Midford, and Cotteswold 

 Sands in the Inferior Oolite (I). 



