1923 ] Ostrea gryphoides Schlotheim in Caleutta. 77 
? Aricia monela, Linn. An essentially marine mollusc. 
This shell was at one time used as money in ver 
Bengal and as it is only represented by one small, 
very worn and polished specimen, its presence may 
be purely adventitious. 
Planorbis ecustus, Desh A common form in ponds around 
Calcutta. 
Anomia achwus, Gray. A common species in the estuary 
of the Ganges. 
Arca udamsiana, Dkr. A single imperfect specimen. 
Ostrea cuculiata, Bow. This oyster is common in brack- 
ish water. 
Ostrea canadensis, Tk. ‘This is the large oyster of the 
Bay of Bengal now known to be Ostrea gryphoides, 
Schlotheim. 
Dr. Annandale concluded that the Clive Street deposit was 
‘in estuarine one from fairly near the upper limits of brackish 
water, as indicated by the presence of essentially freshwater 
Species known to live in ponds and canals containing a small 
percentage of salt in solution. qe 
Tn 1909 or 1910 the Geological Department of the British 
Museum received several large oyster shells 
which had been found in a soil of sandy 
loam and mud about 6 feet below the level 
of Clive Street, during the excavations for 
the foundations of Gillander House. These shells covered 
a space of 10x 4x1 feet and the bed was underlain by good 
blue clay. An exhaustive study by Messrs. R. Bullen Newton 
and E. A. Smith led them to the conclusion that the large 
living oyster of the Bay of Bengal is distinctly separate from 
the Atlantic form Oslrea canadensis found off the coasts of 
Seeond Occur- 
rence of Oysters in 
Clive Strest. 
to one and the same species which the authors show to be 
Ostrea gryphoides, Schlotheim. ' 
Apart from this interesting zoological conclusion Messrs. 
«ori ullen Newton and Smith throw grave 
in se Oyster doubts on the theory which holds that the 
Clive Street oyster bed had a natural, 
he 
William boring. makes it seem apparent that the oyster 
PR: Bullen uiten sina Baca im Smith: ‘: On the Survival of 
a Miocene Oyster in Recent Seas.” Rev. Geol. Surv. Ind., Vol. XLII, 
pp. 1-15 (1912). 
