VOL. XVI.(2) INFERIOR-OOLITE ECHINOIDS I51 
ON THE 
STRATIGRAPHICAL AND GEOGRAPHICAL 
DISTRIBUTION 
OF 
THE INFERIOR-OOLITE ECHINOIDS 
OF THE 
WEST OF ENGLAND 
BY. 
L. RICHARDSON, F.R.S.E., F.L.S., F.G.S., and 
E. TALBOT PARIS 
[Plates XVI. and XVII.—Echinoids. ] 
—— 
CONTENTS 
Page 
I.—Introduction —.... as ae oe bee a 152 
II.—Some General Remarks on the Stratigraphy of the 
Inferior Oolite of the West of England... aa eee 
III.—Stratigraphical Distribution of the Echinoids... fa hge 
1V.— Geographical Distribution ies = 158 
(1) Forms common to both districts. 
(2) Forms restricted to a district, so far as is known 
at present. 
: (3) Forms that have migrated from one district to 
: the other. ; 
V.—Forms which are probably the result of Parallel 
Development... fe ae uae ac Pree i. 
VI.—Remarks on the species, principally with regard to the 
horizons at which they occur : ae oe 
(1) Observations on known Species and Varieties. 
(2) Description of new Species and Varieties. 
APPENDICES 
I.—An Artificial Key to the Genera, by E. Talbot Paris... 184 
II.—On the Correlation of the ‘‘ Top-Beds ” of the Inferior 
: Oolite by means of their Echinoid Fauna, by L. 
Richardson : = oe = 
