56 ON THE SPHENOID, CRANIAL BONES, OPERCULUM, 
when mounting a specimen a few hours ago, I found that, in 
structure, it very See differed from that I had previously 
pared for the microsco The first supposed otolite which I 
mounted was beautifully fesiatelaccie of a deep — colour, ai 
appeared, when examined by objectives of high pow o be 
fectly structureless. ‘The present otolite, like thet. peor 
described, was very hard and difficult to reduce to a a proper degree 
of thinness. Its structure is marked and peculiar, and its colour 
is a very deep red. Whatever these bones may be, they por: 
lo nd s 
' fishes of a different genera, or, at least, 0 ifferent species. 
tu Among those masses of nodular lines are seattered a 
ecstlbie of small circular discs of various degrees of transparency. 
“ The fossil remains in the Coal Measures are generally some- 
what heterogeneously mixed together, and, in some cases, the 
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