1869. ] DAVIDSON—PEBBLE-BED BRACHIOPODA. 89 
Puate VI. 
Fig. 1. Strophomena budleighensis, Day. Internal cast of ventral valve, 
natural size. 
The same, enlarged. 
Interior of same valve, taken by means of gutta percha 
la, 
1», 
from cast. 
. Strophomena Edgelliana, Day. Exterior of dorsal valve. 
Internal cast of dorsal valve, natural size. 
. —— —. Interior of dorsal valve, enlarged. 
. —— ——. Interior of ventral valve, enlarged. 
2 
3 
4 
5 
6. —— Vicaryi, Day. Natural size. 
7 
8 
9 
Interior of ventral valve, enlarged. 
Rouaulti, Davy. Internal cast of both valves, natural size. 
Interior of dorsal valve, enlarged. 
10. —— Ltheridgii, Dav. Internal cast of dorsal valve, natural size. 
11, —— Interior of dorsal valve, enlarged. 
Internal cast of ventral valve. 
13. Chonetes, sp.? Internal cast, natural size. 
138, ? Enlarged cast. 
14, Productus (Leptena) Vicaryi, Salter, sp. Internal cast of ventral 
valve, showing cardinal spines and large muscular scars, 
—_—— 
Discussion. 
Mr. Erneripee agreed with Mr. Davidson as to his determination 
of the species. He had, however, examined the extensive collection 
of Mr. Vicary, and, from the general faczes of the species, he was 
inclined to assign them to the Middle Devonian and Lower Carbo- 
niferous beds. The attribution of the fossils to the Upper Llandovery 
beds was founded on the presence of Lingula crumena, &c.; but he 
thought he could give some clue to the locality from which the pebbles 
had been derived. It had at first, from the lithological character of 
the pebbles as well as from the fossils, been thought that they were of 
Lower-Caradoc age. He himself assigned the rocks from which the 
pebbles had been derived to the Hangman group of North Devon. 
At Anstey’s Cove Mr. Tawney had lately found a series of the same 
class of fossils in a matrix exactly like that of the pebbles. He had 
examined the spot, and there recognized with Mr. Tawney an exten- 
sion of the sandstones of North Devon (the Hangman Grits) on the 
south coast; and certainly, so far as lithological character was con- 
cerned, the rocks were the same as the pebbles. It did not, how- 
ever, follow that all the pebbles came from that particular district, 
but probably from the denudation of the large tract of country of 
Devonian age to the north. There are, however, Silurian species in 
certain of the pebbles, and these he would refer to the denudation of 
rocks in an area mainly to the south of what is now the Devon coast. 
The fauna at Budleigh-Salterton is essentially British, and not 
French, though some few species are common to both areas. The 
bivalves, indeed, are hardly known in France. On the whole, Mr, 
Etheridge concluded that the fossils in the pebbles were Devonian, 
with a slight admixture of Silurian and probably Carboniferous 
forms, derived from rocks at no great distance from the spot where 
the pebbles are found. 
Prof. Ramsay pointed out that in conglomerates we might expect 
