U. S. GEOLOGICAL SURVEY 



MOMOGRAPH XVIII PLATE > 



,. '^* , 



10 





JS 



> 



lb 





'7 



Jf 



zz 



^.«^-^ 



«* 



55",— ' 



/lURICID/E AND FASCIOLARIID/E OF THE LOWER QREENSAND MARLS. 



