4 LIXDSTKOM, INDEX TO GENEKA OF PALAEOZOIC COEALS. 



of the scientific paper, where the gentis was first mentioned 

 and where also the first description generally is given- Some- 

 times also in addition the next work of the same author is 

 cited, in which the genus is more fully described. The letters 

 S. D. C. P. signify the occurence of the cfenus within the 



Silurian, Devonian, Carboniferous or Permian formations. 



It might perhaps have been expected by some to find 

 several other names enumerated besides these given, as for 

 inst. Monticulipora, Constellaria, Reptaria etc.: but as these 

 and similar do not embrace a single coral and are rather to 

 be considered as bryozoa, they have been excluded from the 

 list now published. 



It may at last be added that the author has had occa- 

 sion to compare the original specimens of a great number 

 of genera, and thus to found his opinions on autoptical evi- 

 dence. 



