MARYLAND GEOLOGICAL SURVEY 



LOWER DEVONIAN, PLATE LXXII 



j. 



8 



t 

 P 



13 



m 



14 15 



20 



19 



21 



22 



v , 

 23 



26 



, 



27 



28 



11 



12 



16 



17 



18 



24 



25 



29 



30 



MOLLUSCOIDEA BRACHIOPODA 



