804 REPORT—1896. 
9. Interim Report on the Singapore Caves.—See Reports, p. 399. 
10. Interim. Report on the Calf Hole Exploration. 
11. Interim Report on the High-level Flint-drift at Ightham. 
TUESDAY, SEPTEMBER 22. 
The following Reports and Papers were read :— 
1. Interim Report on the Investigation of the Locality where the 
Cetiosaurus Remains in the Oxford Museum were found. 
2. Interim Report on the Eurypterid-bearing Deposits of the 
Pentland Hills. 
3. Interim Report on the Paleozoic Phyllopoda. 
4. Interim Report on the Registration of Type Specimens. 
5. Fifth Contribution to Rhetic Literature. 
Ly Montacu Browne, F.G.S., F.Z.8. 
The Rhetic Bone-bed of Aust Cliff, and the Rock-bed above it. 
The Rheetic bone-bed of Aust Cliff seldom yields perfect examples of vertebrate 
remains, and still more rarely, if ever, objects in association. An examination of 
the rock shows the reason for this. It is made up largely of sub-angular frag- 
ments or rolled boulders of the Keuper sandstone to be found immediately below 
it, around which are sands, probably of Keuper age, so arranged, and so highly 
charged with fragmentary remains of Rheetic vertebrata and their excretée, as to 
denote currents of considerable turbulence, such as now obtain in seas or estuaries 
of no great depth. 
Of quite a different character are the black shales above, and the bed of stone 
resting thereupon. This band of stone, which has been described by Wright, and 
is known as the Pullastra arenicola bed, shows it to have been much more quietly 
deposited, and it is in this that bones are more likely to be found in association at 
Aust and Westbury-on-Severn. This band of stone is the so-called bone-bed. of 
the ‘Garden Cliff,’ Westbury-on-Severn, of Penarth, Lavernock, and Watchet, 
the true bone-bed of Aust not being represented at those places, or if at Lavernock 
in a very attenuated form. Neither at Pylle Hill, Bristol, nor at the Spinney 
Hills, nor at’ Wigston, Leicester, nor at Walton, Leicestershire, nor in the Notting- 
hamshire Rheetics does a bone-bed exist of the same character as that at Aust; 
the bone-bed of the Spinney Hills, though not of like extent, is on the same 
horizon, and contains specimens in the same state of mineralisation as at Aust 
Cliff. Another point which lends colour to this theory of partial similitude is that 
in both Aust and the Spinney Hill bone-bed remains of Ceratodus have been 
found, which have not yet been obtained.in the lower Pullastra arenicola or 
Isodonta Ewaldi beds. 
It is therefore in the first band of stone containing these invertebrate fossils, 
and which never es immediately upon the ‘ tea-green marls,’ that the most perfect 
