Maryland Geological Survey 



129 





SPECIES 



Maryland 



New Jersey 



New York 





^ 



Helderberg 



1 



1 





.5 

 1 



I 



•o 



1 



2 



1 



1 



1 



1 



1 

 s 



1 



.2 



1 

 ■< 





Keyser 



1 

 1 



1 



3 

 1 



1 



1 



1 

 1 

 1 



i 





§ 



1 

 1 



1 



1 



1 

 .1 



1 



! 



1 

 1 



1 



2 





s 



1 



1 



c2 



1 



1 



, 



.1 

 1 



1 



1 



1 



1 



1 



1 



?45 



MOLLUSCOIDEA-BRACHIOPODA.-Conf d. i I 

 Metaplasia pyxidata (Hall) 

















t 



t 

 t 



i 



t 

 v 



V 



* 



• 



:: 



•• 



;; 







* 





* 



:: 

 .'. 



;; 

 ■■ 



■■ 

 :: 



:: 



•• 



V 



;; 



* 



■• 





• ■ 



* 





? 



••■ 





'Ifi 



Cyrtina rostrata (Hall) 











* 







?47 



Rh3'nchospira rectirostris (Hall) 













948 



Rhynchospira plobosa (Hall) 



* 



* 









V 

 t 



t 



•*■ 







249 



Rhynchospira, formosa Hall 



Trematoapira simplex Hall ? 



Ml 



























".SS 















■"14 



Nucleospira ventricosa (Hall) 





t 







:■ 









•"ifi 







?n7 







258 



Anoplotheca ooncava var. tanolowayensis 





* 



































261 

 262 



Anoplotheca (Leptocoelia) fimbriata (Hall)....'.. 

 Anoplotheca (Leptoccelia) flabellites (Conrad) . . . 

 Whitfieldella prosseri Grabau 











V 



* 







264 



Whitfieldella nucleolata Hall * 



t 



t 







V 



: 







967 

































■'70 



Meristella rostellata Sehuchert 





































?7? 



Merista typa (Hall) . . 



t 





» 













?7S 



MOLLUSO.\— PELECYPODA. 











'.'.*.. 



97 ^> 





















'-fi 

















t 























'.'. 



278 

 ?7i» 



Mytilarca (Plethomytilus) rowei Ohern ;.. 



V 



•• 





■• 











981 





* 



• • 





* 



* 









QS" 

















* 









284 

 "85 



Actinopteria textilis var. arenaria (Hall) I.. 













Actinopteria reticulata Waller . ... 



* 

















987 





288 



Aviculopecten 1 cumberlandensis Ohern '.. 



Aviculopecten tenuilamellatiis Hall 















t 













? 





■■ 





.. 





■^ 











293 



Ilionia sinuaU (Hall) '..!.. 





.. 







t = restricted to Maryland. 



Affine = related species. 



