126 



The Lower Devonian Deposits of Maryland 





SPECIES 



Maryland 



New Jersey 



New York 





H 



Helderberg 



1 



b 



1 



1 



1 



s 



1 



6 



1 



1 

 t 



£ 



1 

 1 



5 



1 



1 



fe 

 w 



1 









Keyser 



i 

 1 



1 

 1 



1 



1 





6 



1 

 1 



1 



1 



i 



■a 

 1 



1 

 1 



2 



1 



is 



1 

 1 



o 



1 

 1 



1 



1 

 i 



1 



1 



1 



il 



1:1 



1 



1 





9« 



MOLLUSCOIDEA-BRYOZOA.-Continued. 





t 









1 









t 



t 

 t 



t 

 ? 



:: 



.. 



•• 

 •• 





•• 



•* 



:" 



* 





•• 



■: 



V 



*■ 



V 





V 







:: 



* 

 * 



•• 



* 

 * 



!J 



V 



V 





V 



47 







98 



Semicoscinium planum Ulrich & Bass'ler 





t 







.. 



99 







••I" 



100 







t 



V 







101 



Orthopora rhombitera (Hall) ? 





•• 





in?, 



Orthopora re^laris (Hall) 





103 















104 







+ 









105 







lOfi 



MOLLUSCOIDEA— BRACHIOPODA 

































ins 







t 







V 







V 









no 







m 













11?. 



Pholidops tumida Schuchert 



* 



* 













113 



Pholldops ovata Hall L. 







115 













'i 









llfi 

















t 

 t 



V 





V 



lis 





119 



Dalmanella perelegans (Hall) 1 . 



1?0 











1?1 



Rhipidomella emarg-inata (Hall) 



t 







V 



122 







123 





























125 



Rhipidomella musculosa var. arctisinuata' 











































127 















* 





.. 





1?S 















129 







* 







V 



t 



• 









130 

 131 



Leptasna rhomboidalis var. ventricosa (Hall)... 

 Lepteiiisca coneava (Hall) 





132 













133 



Stropheodonta arata (Hall) 











134 







? 







ISt 







136 

 137 

 138 

 139 



Stropheodonta (Leptostrophia) beckii (Hall)... 

 Stropheodonta (Leptostrophia) planulata (Hall) 

 Stropheodonta (Leptostrophia) bipartita (Hallj 

 Stropheodonta (Leptostrophia) arctimuscula 



•* 



*• 







■»■ 



* 



■»■ 





t 



UO 



Stropheodonta (Leptostrophia) magniflca 



















141 



Stropheodonta (Leptostrophia) magniventra 





















142 



Strophonella ffenicuiata (Hall) ' . . 



t 





















= restricted to Maryland. 



t Affine = related species. 



