} found at Richmond, Virginia. __ 229 
ap ATS 
perforated with canals similar to those made by the Teredo. If 
the wood thus discovered were allowed to dry in the open air, as 
its moisture evaporated, it became more and more solid, and soon ©. 
assumed the constitution of lignite, having the density, brittle . 
fracture and shining surface of coal. The progress of this change’ 
I had an opportunity of noticing in a piece of wood which lay on 
my table from the time it was exhumed until it was completely 
; converted into lignite. Fruits well preserved were occasionally 
found, and in one instance a nut which was recognized by Prof. 
Agassiz as belonging to the genus Carya or hickory. I have as 
| yet seen but very few unequivocal remains of reptiles. ‘These 
consist of a few teeth which will be noticed in a subsequent por- 
tion of this paper. Coprolites have also been found in great num- ~ 
bers some of them of unusual large size. care nes 
Remains or Mammats.—Sea/s. Among the most interesting 
cerebral convolutions on the parietal bones, the form of th praimal P 
cavity, the deep fossa above the internal auditory foramen, the 
vascular canals opening on the occiput, and the inflated tympanic f 
ies of seals which, * 
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