1872.] LANE FOX PALEOLITHIC IMPLEMENTS. 449 



Finally, the Solenastrcea I described in Quart. Jonrn. Geol. Soc. 

 vol. xxvii. p. 369 is probably a remanie fossil*. It is remarkable 

 tbat the present coral fauna of the British seas should be so poorly 

 represented in the Crag deposits. 



The resemblance of the new species to Trochocyathus meridionalis, 

 Duncan, of the Australian marine Upper Tertiaries below the horizon 

 of the so-called Pliocene is remarkable ; but it probably depends 

 upon the descent of both forms from some unknown Jurassic or 

 Cretaceous ancestor. 



EXPLANATION OF PLATE XXVIIT. 



Fig. 1. Calice of Trochocyathus anglicus: nat. size. 



2. The same, magnified. 



3. Side view of the corallmn. 



4. The base, magnified. 



5. ba. The corallum of Solenastrcea Prestwichi : nat. size. 



6. The calice, greatly magnified. 



7. The epitlieca, magnified. 



S. The endotheca, greatly magnified. 



Discussion. 



Mr. Prestwich inquired whether the fossil bore any resemblance 

 to any of the French Eocene forms, and whether there was any 

 possibility of its being derivative. 



Prof. Dfncan replied that the specimen was but little worn, and 

 was therefore probably not remanie, though this point was not 

 absolutely certain. 



2. On the Discovert of PALiEOLiTHic Implements in Association 

 tuith Elephas peimigenitjs in the Gravels of the Thames Yalley 

 at Acton. By Colonel A. Lane Fox, F.G.S. 



The gravels and brick-earths of this part of the Thames valley have 

 been classed by Mr. Prestwich f and Mr. Whitaker into two prin- 

 cipal groups; — 1st, the high-level gravels of Mr. Prestwich, occu- 

 pying the summits of the hills above the valley ; and, 2ndly, the 

 valley-gravels, occupying the sides and bottom of the valley itself. 



With respect to the former, or high-level gravels, some slight 

 difference of opinion appears at one time to have existed between 

 the two authorities whom I have quoted — Mr. Prestwich including 

 the gravels upon Wimbledon, Wandsworth, and Clapham Commons 

 amongst the high-level gravels, whilst Mr. Whitaker considers the 

 gravels of Wandsworth and Clapham Commons to belong to the valley- 

 gravels. He, indeed, if I understand rightly his memoir on Sheet 

 7 of the Geological Survey Map J, appears to think it possible that 



* As I find that this species cannot be figured, as I expected, in the ' Memoirs 

 of the Palaiontograpbicai Society,' I have inserted figures showing its form and 

 characters on the plate illustrating the new species described in the present paper. 



t The Ground beneath us, its Greological Phases and Changes. By Joseph 

 Prestwich, F.R.S., F.G.S. 



X Memoirs of the Geological Survey of Great Britain, Sheet 7 of the Map of 

 the Geological Survey. 



