97 
OSTREA flabellula. 
TAB. CCLIII. 
Spec. Char. Oblong, arched ; larger valve deep, 
longitudinally plaited, with a toothed margin ; 
the other flat and imbricated, with an entire 
margin. 
Syn. Ostrea flabellula. La March Hist, des Ani - 
maux s. vertebres , vi. 215. 
Cham a plicata. Brander , 84 and 85. 
"V" ery variable in form, like most Oysters, but con- 
stantly arched ; the beaks are prominent, and especially 
of the hollow valve, much curved ; the plaits are some- 
what irregular, but commonly diverge from a curved 
line along the middle of the valve. Some specimens 
have a small wing in the hollow side. The lateral cre- 
nulations are very conspicuous on the sides and edges 
of the flat valve near the hinge. 
This is certainly Brander’s Chama plicata, and the 
same species as that found at Grignon : it is remarkable 
that De La Marck should hesitate to admit the plain 
valves as the same species, Brander’s fig. 84 is so good : 
I have frequently met with the two valves attached. 
Fig. 1 represents a specimen from Hordwell or Bar- 
ton, from which places I have many of all sizes, from 
half an inch to near two inches long, by favour of Miss 
Salisbury, the Rev. Mr. Bingley, and other kind friends. 
Figs. 2, 3, 4, 5, 6, 7, and 9, are from four specimens 
selected from a large number sent me by Charles Lyell 
Jun. Esq. who obtained them at a brick-kiln at Lynd- 
hurst. 
Fig. 8 is a variety, with an uncommonly large beak 
and hinge-pit, from Barton, by favour of Miss Salisbury. 
Larger individuals with stronger undulations are dredged 
up in Ems worth harbour, for specimens of which I am 
indebted to J» Holloway, Esq. 
