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E.. Hitchcock, Jr., on a New Fossil Sheil. 239 
nl 
Art. XIX.—A new Fossil Shell in the Connecticut River Sand- 
stone ; by EH. Hircxcock, Jr. 
T HAVE lately found in the coarse sandstone of Mount Tom, 
(Easthampton, Mass.,) a shell of a mollusk, the first I believe 
that has been discovered in the sandstone of the Connecticut 
Valley. It is preserved and not petrified, and a considerable 
part of it has disappeared. Enough remains however to enable 
us to refer it to a family if not to a genus of shells. It is ‘repre- 
sented in the annexed diagram of the natural size as it lies in 
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the rock. The upper part is gone, leaving an oval opening about 
an inch and three quarters in one diameter and an inch and one 
quarter in the other. It extends downwards, tapering somewhat 
rapidly nearly an inch and a half, and is left without a bottom, 
he lower opening being about an inch wide. The walls are 
Very thick, in some places nearly half an inch, and made up of 
Several concentric layers. 
Tom the resemblance of this shell to a model of the lower 
valve of the Sphzerulites calceoloides in the Cabinet of Amherst 
College, it seems probable that it may be referred to that family 
of Brachiopods denominated Rudistx b 
