402 Geological Society : — 



Dr. Blackmore described the materials composing the gravel 

 of Milford Hill, and discussed the nature and power of the forces 

 which had brought them together. He then described the position, 

 thickness, and physical relations of the deposit, stating that the 

 gravel is from 10 to 12 feet thick on the top of the hill, becoming 

 thinner and gradually dying away on the sides. The hill itself is 

 quite isolated, being separated from the surrounding higher land by 

 river- valleys ; its highest point is about 100 feet above the present 

 level of the rivers. 



In making a cutting on the south-eastern side of the hill, a bed 

 of sand containing four species of land- shells was discovered near 

 the base of the gravel. No other fossils have been found in the 

 deposit, with the exception of a single tooth of a species of Equus. 



Dr. Blackmore concluded by describing the implements them- 

 selves, which nearly all belong to the long-pointed type, thus con- 

 firming the opinion of Mr. Evans, that this form is mainly charac- 

 teristic of the Higher-level gravels. 



March 8, 1865 — W. J. Hamilton, Esq., President, in the Chair. 



The following communications were read :— 



1. " On the Echinodermata from the South-east coast of Arabia, 

 and from Bagh on the Nerbudda." By P. Martin Duncan, M.B , 

 Sec. G.S. 



In this paper Dr. Duncan described eight species of Echinoderms, 

 only one of which was new, from Ras Fartak and Ras Sharwen on 

 the south-east coast of Arabia, and four from Bagh on the Ner- 

 budda. He also mentioned five determinable species of other 

 classes from each locality. Of these fossils, Hemiaster similis, 

 D'Orb., and Pecten quadricostatus, Sow., were alone common to the 

 two localities; but with the exception of the new Echinoderm, 

 which was named Cottaldia Carteri by Dr. Duncan, all the species 

 occur in European Cretaceous rocks. He considered the fossils 

 from the two localities to belong to the same period, and discussed 

 the question of the correlation of the deposits containing them with 

 those of Europe, coming to the conclusion that they were most pro- 

 bably of Cenomanian rather than Neocomian age, and of later date 

 than the Pondicherry series ; but he also remarked 'that it is im- 

 possible to determine their exact contemporaneity, the vertical range 

 of many of the species being so great, and the parallelism of the 

 allied European Cretaceous beds not exact. 



In conclusion, Dr. Duncan discussed several questions arising out 

 of a comparison of fossils from distant localities, especially the 

 specific identity of similar specimens occurring in different forma- 

 tions, or in distant regions ; also the variability of certain species, 

 and the idea of " homotaxis." 



2. " On the Fossil contents of the Genista Cave at Windmill 

 Hill, Gibraltar." By George Busk, Esq., F.R.S., F.G.S., and the 

 late Hugh Falconer, M.D., F.R.S., F.G.S. 



This was a letter addressed by the authors to His Excellency the 

 Governor of Gibraltar, General Sir W. J. Codrington, K.C.B., &c, 



