31 
telus, or a dipleura, we are unable now to de¬ 
termine. In the Geol. Trans., No. 8, Vol. I. 
pi. 27, there is a figure by Mr. Stokes of what 
is said to be the under surface of the anterior 
portion of the shield of an asaphus platycepha- 
lus from Lake Huron. Dr. Buckland, whose 
copy of the figure we have only seen, observes 
concerning it, that the entrance to the sto¬ 
mach of the animal was between these lunate 
processes, “analogous to that in recent crabs.” 
The A. platycephalus is synonymous with L 
gigus of Dr. Dekay; and if Mr. Stokes’s 
drawing and Dr. Dekay’s figure be accurate 
representations of nature, we think they must 
be drawn from analogous fragments belonging 
to animals at least specifically distinct. 
We have called the fossil remain which 
has occasioned the present remarks respect¬ 
ing the organization of the under surface of 
the trilobite, calymene bufo, a name which 
we proposed some years since in our little 
work on these interesting reliques. Other 
writers have applied to it the term caly- 
