yrrrrs 
Geological Society. 631 
Brachyphyllum mammillare (Brongniart). 
Llatocladus plana (Feistmantel). 
The Ceylon plant-bearing beds coincide, both in the composition 
of the flora and in their relation to the older igneous rocks, with 
those of Madras. 
2. ‘The Carboniferous Limestone (Avonian) of Broadfield 
Down (Somerset).’ By Frederick Stretton Wallis, M.Sc., F.G.S. 
This area affords yet another proof of the application of 
Arthur Vaughan’s system of zonal classification of the Avonian to 
districts other than the type section of the Avon Gorge, Clifton. 
Both lithologically and palwontologically the area holds an 
intermediate position, and forms a link, between the developments 
of the Bristol and the Mendip districts. 
A well-marked faunal assemblage (‘ Fossiliferous Level’), of no 
great vertical extent, is described from the top of §S,, and is shown 
to constitute in this area a very useful field determination of 
the datum-line between the 8, and 8, subzones. 
Pustula elegans (M‘Coy) is here for the first time recorded 
from the S, subzone. Subzones Z, and D,, hitherto unrecorded 
from this area, are shown to be present. 
February 22nd, 1922.—Prof. A. C. Seward, Se.D., F.R.S., 
President, in the Chair. 
The following communications were read :— 
1. ‘Description of a New Plesiosaur from the Weald Clay of 
Berwick (Sussex).’ By Charles William Andrews, B.A., D.Sc., 
BERS. EGS. 
The imperfect Plesiosaurian skeleton which forms the chief 
subject of the present paper was found in a large septarian nodule 
from the Weald Clay of Berwick (Sussex). The specimen was 
collected by Mr. 8. Tooth, who has presented it to the British 
Museum. ‘The parts preserved are the posterior region of the 
skull, numerous cervical and dorsal vertebre (some still- articu- 
lated one with the other), the shoulder-girdle, and the humeri. 
The pelvis and hind limbs are entirely wanting, as also are the 
distal portions of the fore-paddles. The bones lay mixed up, in 
the greatest confusion, in an intensely hard matrix, from which 
they have been, for the greater part, freed with consummate 
skill. 
The skull is very imperfect: it seems to resemble most closely 
the skull of Plesiosaurus capensis Andrews, from the Uitenhage 
Series of South Africa. The cervical vertebrat are also very 
similar to those of the African species, having the central portion 
of, the articular surfaces deeply cupped: they are, moreover, 
interesting, on account of the presence in this region of well- 
developed inter-vertebral discs (? of calcified cartilage) between 
the successive centra. The shoulder-girdle is in an almost. perfect 
