GE^VS FUSULINA. 307 



The apparent absence of a canal-systcni, and the ostensible singleness of the septal lamellae, 

 may be due to the molecular change to which the shell has been subjected; but even 

 admitting them to be real, they do not negative the title of F/mi/hx/ to a place in the Num- 

 nuiline series, since, as we have seen, the same characters of degradation arc presented by 



Geolofjicol Distrihutum. — This type is not known to present itself in any other formation 

 than the Carboniferous Limestone, occurring especially in that of Russia, a particular bed of 

 which is in great prat made up of vast accumulations of its fossilized shells ; it occurs also in 

 the same formation in the State of Ohio (North America, civ), and in the Arctic regions. 



