Avicula oblonga Meek & Worthen, 1861 † (original description)
Aviculopecten amplus Meek & Worthen, 1861 † (original description)
Aviculopecten burlingtonensis Meek & Worthen, 1861 † (original description)
Aviculopecten coxanus Meek & Worthen, 1861 † (original description)
Aviculopecten interlineatus Meek & Worthen, 1861 † accepted as Annuliconcha interlineata (Meek & Worthen, 1861) † (original description)
Aviculopecten koninckii Meek & Worthen, 1861 † (original description)
Aviculopecten oweni Meek & Worthen, 1861 † (original description)
Aviculopecten pellucidus Meek & Worthen, 1861 † (original description)
Bellerophon crassus Meek & Worthen, 1861 † accepted as Waagenella crassa (Meek & Worthen, 1861) † (original description)
Cardiomorpha radiata Meek & Worthen, 1861 † accepted as Cardiopsis radiata (Meek & Worthen, 1861) † (original description)
Cyrtoceras curtum Meek & Worthen, 1861 † (original description)
Cyrtoceras dilatatum Meek & Worthen, 1861 † (original description)
Eulima peracuta Meek & Worthen, 1861 † (original description)
Eunema salteri Meek & Worthen, 1861 † accepted as Orthonema salteri (Meek & Worthen, 1861) † (original description)
Euomphalus planodorsatus Meek & Worthen, 1861 † (original description)
Euomphalus umbilicatus Meek & Worthen, 1861 † (original description)
Leda (Yoldia) levistriata Meek & Worthen, 1861 † (original description)
Loxonema cerithiformis Meek & Worthen, 1861 † (original description)
Loxonema inornata Meek & Worthen, 1861 † (original description)
Loxonema nitidula Meek & Worthen, 1861 † (original description)
Loxonema rugosa Meek & Worthen, 1861 † (original description)
Loxonema scitula Meek & Worthen, 1861 † (original description)
Macrocheilus intercalaris Meek & Worthen, 1861 † (original description)
Macrocheilus medialis Meek & Worthen, 1861 † (original description)
Macrocheilus pulchellus Meek & Worthen, 1861 † (original description)
Myalina angulata Meek & Worthen, 1861 † (original description)
Myalina concentrica Meek & Worthen, 1861 † (original description)
Myalina recurvirostra Meek & Worthen, 1861 † (original description)
Naticopsis hollidayi Meek & Worthen, 1861 † (original description)
Naticopsis nodosus Meek & Worthen, 1861 † accepted as Trachydomia nodosa (Meek & Worthen, 1861) † (original description)
Nautilus chesterensis Meek & Worthen, 1861 † (original description)
Nautilus digonus Meek & Worthen, 1861 † (original description)
Nautilus planorbiformis Meek & Worthen, 1861 † (original description)
Nautilus sangamonensis Meek & Worthen, 1861 † (original description)
Nautilus spectabilis Meek & Worthen, 1861 † (original description)
Nautilus subglobosus Meek & Worthen, 1861 † (original description)
Nautilus trisulcatus Meek & Worthen, 1861 † (original description)
Pecten tenuilineatus Meek & Worthen, 1861 † (original description)
Platyostoma nanum Meek & Worthen, 1861 † (original description)
Platyostoma tumidum Meek & Worthen, 1861 † (original description)
Pleurotomaria chesterensis Meek & Worthen, 1861 † (original description)
Pleurotomaria granulostriata Meek & Worthen, 1861 † (original description)
Pleurotomaria pratteni Meek & Worthen, 1861 † (original description)
Pleurotomaria scitula Meek & Worthen, 1861 † accepted as Dictyotomaria scitula (Meek & Worthen, 1861) † (original description)
Pleurotomaria shumardi Meek & Worthen, 1861 † (original description)
Pleurotomaria speciosa Meek & Worthen, 1861 † accepted as Worthenia speciosa (Meek & Worthen, 1861) † (original description)
Pleurotomaria subconstricta Meek & Worthen, 1861 † (original description)
Pleurotomaria subscalaris Meek & Worthen, 1861 † (original description)
Pleurotomaria subsinuata Meek & Worthen, 1861 † (original description)
Pleurotomaria tenuicincta Meek & Worthen, 1861 † (original description)
Pleurotomaria turbiniformis Meek & Worthen, 1861 † accepted as Euconospira turbiniformis (Meek & Worthen, 1861) † (original description)
Schizodus chesterensis Meek & Worthen, 1861 † (original description)
Solemya radiata Meek & Worthen, 1861 † (original description)
Soleniscus Meek & Worthen, 1861 † (original description)
Soleniscus typicus Meek & Worthen, 1861 † (original description)

Illinois for Avicula oblonga Meek & Worthen, 1861 † 
Illinois for Aviculopecten amplus Meek & Worthen, 1861 † 
Illinois for Aviculopecten coxanus Meek & Worthen, 1861 † 
Illinois for Aviculopecten interlineatus Meek & Worthen, 1861 † 
Illinois for Aviculopecten oweni Meek & Worthen, 1861 † 
Illinois for Aviculopecten pellucidus Meek & Worthen, 1861 † 
Illinois for Bellerophon crassus Meek & Worthen, 1861 † 
Illinois for Cyrtoceras curtum Meek & Worthen, 1861 † 
Illinois for Cyrtoceras dilatatum Meek & Worthen, 1861 † 
Illinois for Eulima peracuta Meek & Worthen, 1861 † 
Illinois for Eunema salteri Meek & Worthen, 1861 † 
Illinois for Euomphalus planodorsatus Meek & Worthen, 1861 † 
Illinois for Euomphalus umbilicatus Meek & Worthen, 1861 † 
Illinois for Leda (Yoldia) levistriata Meek & Worthen, 1861 † 
Illinois for Loxonema cerithiformis Meek & Worthen, 1861 † 
Illinois for Loxonema inornata Meek & Worthen, 1861 † 
Illinois for Loxonema nitidula Meek & Worthen, 1861 † 
Illinois for Loxonema rugosa Meek & Worthen, 1861 † 
Illinois for Loxonema scitula Meek & Worthen, 1861 † 
Illinois for Macrocheilus intercalaris Meek & Worthen, 1861 † 
Illinois for Macrocheilus pulchellus Meek & Worthen, 1861 † 
Illinois for Myalina angulata Meek & Worthen, 1861 † 
Illinois for Myalina recurvirostra Meek & Worthen, 1861 † 
Illinois for Naticopsis hollidayi Meek & Worthen, 1861 † 
Illinois for Naticopsis nodosus Meek & Worthen, 1861 † 
Illinois for Nautilus chesterensis Meek & Worthen, 1861 † 
Illinois for Nautilus sangamonensis Meek & Worthen, 1861 † 
Illinois for Nautilus spectabilis Meek & Worthen, 1861 † 
Illinois for Nautilus subglobosus Meek & Worthen, 1861 † 
Illinois for Pecten tenuilineatus Meek & Worthen, 1861 † 
Illinois for Platyostoma nanum Meek & Worthen, 1861 † 
Illinois for Platyostoma tumidum Meek & Worthen, 1861 † 
Illinois for Pleurotomaria chesterensis Meek & Worthen, 1861 † 
Illinois for Pleurotomaria granulostriata Meek & Worthen, 1861 † 
Illinois for Pleurotomaria pratteni Meek & Worthen, 1861 † 
Illinois for Pleurotomaria scitula Meek & Worthen, 1861 † 
Illinois for Pleurotomaria shumardi Meek & Worthen, 1861 † 
Illinois for Pleurotomaria speciosa Meek & Worthen, 1861 † 
Illinois for Pleurotomaria subconstricta Meek & Worthen, 1861 † 
Illinois for Pleurotomaria subscalaris Meek & Worthen, 1861 † 
Illinois for Pleurotomaria subsinuata Meek & Worthen, 1861 † 
Illinois for Pleurotomaria tenuicincta Meek & Worthen, 1861 † 
Illinois for Pleurotomaria turbiniformis Meek & Worthen, 1861 † 
Illinois for Solemya radiata Meek & Worthen, 1861 † 
Illinois for Soleniscus typicus Meek & Worthen, 1861 † 
Indiana for Cardiomorpha radiata Meek & Worthen, 1861 † 
Indiana for Myalina concentrica Meek & Worthen, 1861 † 
Indiana for Nautilus digonus Meek & Worthen, 1861 † 
Indiana for Nautilus trisulcatus Meek & Worthen, 1861 † 
Iowa for Aviculopecten burlingtonensis Meek & Worthen, 1861 † 
Iowa for Aviculopecten koninckii Meek & Worthen, 1861 † 
Iowa for Nautilus planorbiformis Meek & Worthen, 1861 † 
USA for Pleurotomaria turbiniformis Meek & Worthen, 1861 †