VOL. XVIII. (3) ECHINOID FAUNAS 251 



THE CHRONOLOGICAL SUCCESSION 



OF THE 



ECHINOID-FAUNAS in the INFERIOR-OOLITE ROCKS 



OF THE 



STONESFIELD — BURTON-BRADSTOCK DISTRICT 



BY 

 LINSDALL RICHARDSON, P.R.S.E., F.G.S. 



I have now done all that I intend doing in connection with 

 the echinoids from the Inferior-Oolite rocks of the district 

 between Stonesfield, in Oxfordshire, and Burton-Bradstock, 

 on the Dorset coast. 



The first instalment of the information collected by 

 Mr E. Talbot Paris and myself was published in August, 

 1908,' and the second in April, 1913.'' Since the latter date 

 I have re-visited the Burton-Bradstock district on three 

 occasions. Only a few additional records were made. 



The accompanying list shows the species of echinoids that 

 have been obtained from the deposits of fuscce-aalensis hemerae 

 inclusive. 



. With the exception of the specimens marked with an 

 asterisk, Mr Paris or I collected from the horizons indicated 

 examples of all the species recorded. They were identified 

 with the aid of Wright's well-known Monograph (Palaeont. 

 Soc). 



The whole of my collection of Echinoids from the In- 

 ferior Oolite Series is now in the British Museum (Natural 

 History) . 



I Proc. Cotteswold Nat. F.C., vol. xvi., pt. 2 (1908), pp. 151-190, and pis. xvi. and xvii. In 

 the list on page 158 of this paper of " forms common to both districts," records from the Top-Beds 

 of Dundry Hill were considered in connection with the Doulting— Burton-Bradstock district. In the 

 present paper, Dimdry Hill so far as its • ' Top-Beds " are concerned, is associated with the Doulting — 

 Stonesfield district, so that Cidaris wrigkti Desor, Holectypus depressus (Leske), and Magnosia forbesi 

 Wright will have to be deleted. 



Lines 4-6 on page 159 of the rgoS paper should be revised to : " Except for these three echinoids 

 atid Pseudodiadema [Trochotiara^ depressum Ag., the other species which are given in the above list 



are confined to beds of garantianx, and post-garantiana date " T^e words in italic are 



additions. 



In Table iv., on page 160, Clypeus hugiAg. should be deleted, as it has now been recorded from 

 both districts. " Hyboctypus ovalis Wr.," under the heading " Bajocian " must be replaced by 

 GaUropygus sp. (see Proc. Cotteswold Nat. F C, vol. xWii., pt. i, 1912, pp. 79 and 80). 



2. Proc. Cotteswold Nat. F.C. vol. xviii., pt. i (rgiz) , pp. 73-82 and pi. viii. 



