622 Correspondence — W. Wright 4" B. C. PoIMnghorne. 



THE DISCOVERY OF IfAESUPITHS IN THE CHALK OF THE 

 CROYDON AREA. 



SiK, — With reference to Dr. Hinde's paper on "The Zone of 

 Marsupites in the Chalk near Croydon," we should like to point out 

 that though in general his observations corroborate ours, we found 

 at least four specimens of Marsupites with nearly complete tests, one 

 with brachial joints in position, and a block containing most of the 

 test plates and associated brachial plates, which is now in the 

 possession of Dr. Bather. We also found several specimens of 

 jEchinoconus coniciis near the Pank's Hill Road end, and in another 

 part Janira qtiinquecostata. We agree with him that " the dip of the 

 Chalk from the summit towards the north is probably about the 

 same as that of the general slope of the surface," and see no occasion 

 for Mr. Dibley's theory of a fold in the chalk. He says that the 

 upper part of the Cor-anguinum beds are exposed at Beddington. 

 We have questioned him as to this, and he admits he should have 

 written Carshalton, and says he meant the section we showed him 

 a few months ago which we then thought was no higher than the 

 Cor-anguinum zone. Recently we have found there, among other 

 fossils, tests and brachial plates of Uintacriniis. 



With all due respect to Dr. Hinde, we cannot help expressing our 

 surprise that he did not consider it necessary to refer to us as the 

 original discoverers of the Marsupites zone in Surrey. Mr. Dibley 

 certainly mentions us in a somewhat casual way, but as Dr. Hinde's 

 paper is page-headed " Discovery of Marsupites, etc.," few readers 

 will be aware that we made the discovery, spent days and hours 

 among the thrown out blocks, inspected the trenches and tunnels, 

 and had prepared a paper for the Proceedings of the Geologists' 

 Association. It was unfortunate that our paper was not first in the 

 field, as we were, but as we are mentioned in the number of your 

 journal which contains Dr. Hinde's article, we have the satisfaction 

 of knowing that the credit, if any, will be equally divided between 

 the discoverers and the eminent geologist who has given his valuable 

 time to the production of such an interesting and scientific paper. 



W. Wright. 

 13, Devereux Road, B. C. PolkinGHORNE. 



Wandsworth Common, S.W. 

 November 16t/i, 1904. 



nVCIS OE LXj JLIsTE O U S - 



The Palaeontology of the Lower Coal - measures of Lancashire 

 is very fully dealt with by Mr. H. Bolton in the Transactions of 

 the Manchester Geological and Mining Society (vol. xxviii, part 14). 



Erratum. — In Mr. Coomaraswamy's paper on the Balangoda 

 Group, in the August number, p. 422, the figure was one-half 

 natural size, and not 5^ times as there stated. 



