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APPENDIX. 
further examination, to the period in which these fresh¬ 
water strata were formed that contain the shells of Cy- 
rena. 
4. We have from the hills near Prome a coarse-grained 
yellow shelly and sandy limestone, scarcely distinguishable 
from the calcaire grossier of Paris ; and from several places 
higher up the Irawadi, particularly at Pugan, we have a 
dark bituminous slaty limestone, in which Mr. Sowerby 
has recognised the following fossils as identical with those 
of the London clay. 
Ancillaria I Lamarck, Environs de Paris. Only found 
Murex ) in London clay and calcaire grossier. 
Cerithium I T i i 
y London clay 
Oliva ) J 
Astarte rugata. (Min. Conch.) London clay and 
calcaire grossier. 
Nucula rugosa. London clay and calcaire grossier. 
Erycina. 
Tellina. London clay :—shell figured by Brocchi. 
Teredo. In blocks of calcareous wood : the same as 
in the London clay. 
Teeth of Shark. London clay. 
Scales of fishes. London clay. 
Pebbles of rolled black bone. 
Unknown radiating fossil, resembling coral. 
This recognition of a stratum so nearly resembling the 
London clay in respect of its peculiar shells and other 
fossils, in so distant a part of Asia, receives still further 
interest when viewed in conjunction with the information 
that has been afforded to us by Mr. Colebrooke, as to 
the existence of a similar formation at Cooch-Behar in the 
N.E. border of Bengal, where the Brahmputra emerges 
into the plain. Here Mr. Scott discovered strata of yellow 
and green sand alternating with clay, that lie horizontally 
