EASTMAN : CARBONIFEROUS FISHES FROM THE CENTRAL WEST. 221 
S. A. Miller, and others at this locality a number of years ago, and more re- 
cently Prof. J. A. Udden has collected further specimens of the same sort near 
Burlington. The nature of these bodies 
is entirely problematical, some of the 
best-known palaeontologists who have ex- 
amined them being unable to express any 
decided opinion concerning them. Their 
finely laminated structure does not in the 
least indicate them to be of vertebrate 
origin, nor can they be satisfactorily 
classed with plant remains. The sugges- 
tion that they may have to do with Mol- 
luscan remains is as compatible as any 
with the internal structure, but we are at 
-a loss to identify them with the usual 
hard parts, not even excepting the beaks 
of Nautiloids. Any attempt to hhomolo- 
gize them with any known Crustacean 
structure is equally baffling. Owing to 
the not uncommon occurrence of these 
bodies in accompaniment with fish-remains 
in the Kinderhook, they are at least 
Fie. 17. 
Problematical fossil from the Kinder- 
hook limestone of Burlington, Iowa, 
x =: 
worthy of passing notice, and the accompanying figure is given in the hope 
that some clue may be found concerning their true nature. 
