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HISTORICAL GEOLOGY 



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Fig. 454. — Carboniferous brachiopods : A, Productus costatus (Pennsylvanian) ; 

 B, Athyris lamellosa (Mississippian) ; C, Spirifer cameratus (Pennsylvanian) ; D, Rhipi- 

 domella burlingtonensis (Mississippian) ; E, Seminula argentea (Pennsylvanian) ; F, 

 Derbya crassa (Pennsylvanian) ; G, Productus burlingtonensis (Mississippian) ; H, 

 Spiriferina spinosa (Pennsylvanian) ; /, Seminula subquadrata (Mississippian) ; /, Eu- 

 metria marcyi (Mississippian) ; K, L, Dielasma bovidens (Pennsylvanian) ; M, Hustedia 

 mormoni (Pennsylvanian). 



Ik,. 455, — Carboniferous gastropods : A, Plastostoma broadheadi (Mississippian) ; 

 /y, C, two views of Bellerophon sublcevis (Mississippian) ; D, Pleurotomaria nodulostriata 

 ('Mississippian;; E, Worthenia tabulata (Pennsylvanian); F, Naticopsis altonensis 

 (Pennsylvanian); <i, lirllrrophon percarinatus (Pennsylvanian). Foraminifera : //, 

 Fusulina secalica (Mississippian); /, section of Fusulina, showing structure. 



