284 ON THE BRITISH CARBONIFEROUS FENESTELLID &. 
Fragments of Fenestella are not always to be relied upon for the 
purposes of classification. It is clear from what has been said that 
if fragments of Polyzoa had been less relied upon by describers, 
much of what has been written in this paper would have been un- 
necessary. 
Discussion. 
Mr. Dr Rance bore witness to the great industry of the author 
in working out this question, and to the value and excellence of 
preservation of the specimens derived from the Halkin-Mountain 
quarries. 
