118 



PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 23, 



« 







-S 



«e 



<a 



^ 



^ 



^ 



^ 



^PP 



-« 



58 



^ 



<o 





•lo 





© 



^ 



o 



^ 



^ 



u 



"O 



t> 



s; 







'<?a 







•<;> 













5S 





t 



1 





< 



1 



1— < 





f 



bo 



1 

 1 





•pH 







Ph 



1 

 1 





rtf 



