232 Geological Society : — 



and was distinguished from the other species of that genus by its 

 dense epitheca, its small and prominent columella, and its inverted 

 calicular margin. He proposed to name it Trochocyathus anglicus, 

 and stated that its nearest alliance is with the Australian Upper 

 Tertiary form described by him under the name of T. meridionalis. 



2. "On the Discovery of Palaeolithic Implements in association 

 with Elephas primigenius in the High-terrace Gravels at Acton and 

 Ealing." By Col. A. Lane Eox, F.G.S. 



The gravels in the neighbourhood of Acton have been divided by 

 Mr. Prestwich into two principal groups, viz. the high-level gravels, 

 on the hills above the valley, and the valley-gravels, on the sides and 

 bottom of the valley itself. The valley-gravels have been again 

 divided by Mr. Whitaker into three terraces, viz. a high terrace, 

 between 50 and 100 feet above the Ordnance datum, a mid terrace, 

 between 20 and 40 feet high, and a low terrace, at an average 

 height of 10 feet, occupying the low ground in the bends of the river. 

 On both sides of the river the high terrace is separated from the 

 mid terrace by a strip of the London Clay, which is laid bare at an 

 average level of 50 feet. The London Clay is also laid bare on the sides 

 of the tributary streams running into the valley on both sides of the 

 river, thus dividing the high-terrace gravel into patches. The mid 

 terrace is continuous, and follows the sinuosities of the valley on 

 both sides up to the strip of London Clay. The author accounts for 

 this distribution of the gravels by supposing that a large body of 

 water must at one time have stood at the 50-feet level, and the 

 denudation of the high terrace have been caused by the waves beat- 

 ing on the sides of the valley, and by drainage into this body of 

 water. The mid terrace he conceives may have been caused in part 

 by accumulations beneath this body of water. 



The position of the high-terrace gravel at Acton corresponded so 

 closely to that of the implement-bearing gravels of the Somme and 

 the Ouse, that the author was led to examine carefully the excava- 

 tions made in it for the construction of houses. He discovered a 

 number of implements of the drift-type, together with flakes and 

 cores, and a few roughly formed scrapers ; all these were found in 

 close contact with the London Clay, and beneath the gravel. Frag- 

 ments of fern (Osmunda regalis) and of wood (Pinus sylvestris) were 

 also found with the implements at the same level. Two implements 

 were found at Ealing Dean, 2 miles westward, on nearly the same 

 level as those of Acton, viz. 90 feet ; and these also came from the 

 bottom of the gravel. Another implement was found south of the 

 river at Battersea Bise, in the same position above the strip of 

 London Clay as at Acton, and at about 60 feet above the Ordnance 

 datum. The implements are of the pointed and oval types. The 

 only animal remains discovered in the high terrace consisted of a 

 tooth of Elephas primigenius in the Acton gravel. The position of 

 this the author believes to be reliable, although he did not discover 

 it himself in situ. 



In the mid- terrace gravel a number of pits were examined be- 



