ON THE FAUNA AND FLORA OF THE TRIAS OF THE BRITISH ISLES. 
places all round the Droitwich basin at the same horizon. 
313 
The fossils 
may be divided into those found in :— 
(1) The Sandstone. 
PLANTS. 
Equisetites arenaceus (Jaeger): Pith- 
casts and leaves. 
Zamites grandis (Arber): Leaves. 
Voltzia, sp.: External surface of stem, 
male cone, and pith-casts of stems. 
Coniferous wood. 
PISCEs. 
Spine of Acrodus. 
Coprolite. 
AMPHIBIA. 
Teeth and cranial bones of a Labyrin- 
thodon (Mastodonsaurus) 2 
(2) The Shales, 
PLANT, 
Eyuisetites arenaceus (Jaeger): Pith- 
casts. 
Equisetites sp. 
? Chiropteris digitata (Brongn.). 
? Pterophyllum sp. (Schimper and 
Mougeot): Leaves. 
Voltzia sp.: Pith-casts of stem and 
male cones, 
Conites sp. 
? Schizoneura sp. 
ARTHROPODA. 
Estheria minuta. 
Arachnid remains, probably of a scor- 
C~ Repriuia. piee: 
Hyperodapedon: Teeth, cranial and Ppysces. 
other bones, Dipteronotus cyphus. 
Scales, 
The specimens are now in the Sedgwick Museum at Cambridge. 
The Faunal Suceession in the Carboniferous Limestone of the South- 
west of England.—Report of the Committee, consisting of Pro- 
fessor J. W. GREGORY (Chairman), Dr. A. VAUGHAN (Secretary), 
Dr. WHEELTON H1nD, and Professor W. W. Warts, appointed ta 
enable Dr. A, Vaughan to continue his Researches thereon, (Drawn 
up by the Secretary.) 
TuE work has progressed steadily, but Jess rapidly than was anticipated 
owing to the necessity which has arisen of investigating the validity of 
certain genera and the correct application of specific names, 
I.—The Aronian Sequence in the Gower. 
The zoning of the Avonian sequence of the Gower Peninsula, under- 
taken in conjunction with Mr. E. E, L. Dixon in the summer of 1905, is 
now completed, and the results will be presented to the Geological Society 
early next session. 
In this investigation the chief. interest, from a zonal standpoint, 
centres in the occurrence of a higher faunal level than is known from 
any other point of the South-western Province. The level here 
referred to is that of the Oystermouth beds, of which the well-known 
Bishopston rotten-stones are the degraded representatives. The list of 
genera from these beds is practically identical with that from the Upper 
Tournaisian—a fact which may be taken to imply equivalence of environ- 
ment. Important conclusions as to variation in time during the Viséan 
period have therefore been reached by comparing the several species of each 
genus at the Oystermouth level (uppermost Viséan) and those of the 
same genus in the Upper Zaphrentis-Zone (Upper Tournaisian), The 
