Extensive collections of Pennsylvanian marine gastropods from 20 marine units in the Appalachian Basin contain 227 recognizable taxa. Twenty-two new species and subspecies are recognized includingBellerophon(Bellerophon)laticallis, B.(B.)graphicus varicallis, B.(Pharkidonotus)breyeri, Knightites(Cymatospira)montfortianus discordis, K.(Retispira)fascireticulatus, Colpites lirata, Abylea formosa, A. paradoxus, A insolitus, Spiroscala decorata, Euconospira equisita, Neilsonia invisitata, Worthenia parvula, Gosseletina nodosa, Glyptotomaria(Dictyotomaria)concinna, G.(D.)facta, G.(D.)decora, Phymatopleura preclara, Callispira grossa, Ceraunocochlis?subulata, Streptacis?ingens, and S.?complanata.Correlation of marine stratigraphic units within the collection area are discussed. Zonation on the basis of pseudozygopleurid taxa, following that of Anderson et al. (1989), is presented as well as mention of characteristic taxa of the various series.

Specimens of the gastropod genus Donaldina are numerous throughout marine units of the Pottsville, Allegheny, and Conemaugh Groups in the Appalachian Basin. Six species of Donaldina from thirteen marine units are described. New species proposed are Donaldina quadroliratus, from Pottsville and Allegheny units, and Donaldina superclivis, from Conemaugh units.

Hollinacean and kirkbyacean ostracodes are rare to abundant components of the ostracode faunas in the Pennsylvanian marine units of the Appalachian Basin. The diversity of these two groups appears lower in the Appalachian Basin than as reported from the Eastern Interior Basin. Thirty-six taxa, nine hollinelliid and 27 kirkbyiid, are identified. Three new species, Amphissites (Amphikegelites) sohni, Kegelites cooperi, and Kirkbya causa, are proposed.Kirkbyaceans from the Morrowan–Atokan portion of the section compare favorably with those described from the Eastern Interior Basin. The Shleesha rothi Zone of the Eastern Interior Basin can be recognized in the Appalachian Basin, comprising Morrowan and Atokan units. Desmoinesian units in the Appalachian Basin contain many taxa extending up from the Atokan, but several new forms appear. Of the latter, Kegelites cooperi is the most diagnostic species and is the name bearer for the Kegelites cooperi Zone. Missourian–Virgilian faunas are significantly different from those in the Desmoinesian, but are not separable from each other. These units are grouped together into the Kegelites dattonensis Zone.

Bairdiid ostracodes are commonly present in the Pennsylvanian marine zones in the Appalachian basin. Thirty-one taxa are recognized representing the genera Bairdia McCoy, 1844; Orthobairdia Sohn, 1960; Cryptobairdia Sohn, 1960; Rectobairdia Sohn, 1960; Bairdiolites Croneis and Gale, 1939; and Bairdiacypris Bradfield, 1935. Two questionable bairdiid genera, Entmema new genus and Hastacypris Croneis and Gutke, 1939, are included. Seven new taxa, Bairdia cuspidis, Rectobairdia absidata, R. apiculata, R. levis, R. sohni, Entmena distenta, and Hastacypris acutula, are described. Fabalicypris Cooper, 1946, is considered a junior synonym of Bairdiacypris Bradfield, 1935.The diversity of bairdiids is significantly lower in the Appalachian basin than in the Eastern Interior and Western Interior basins.

Endothyroid foraminifers are common in most marine Pennsylvanian units in the Appalachian Basin. The genera Planoendothyra Reitlinger, 1959, and Endothyranella Galloway and Harlton, 1930, are the dominant taxa. Scarce Endothyra Phillips, 1846, are restricted below the Desmoinesian. The greatest change in stratigraphic distribution of taxa occurs at the Atokan-Desmoinesian boundary.Sixteen taxa are recognized. Five new species are proposed, including Planoendothyra orbiculata, P.? associata, Endothyranella kentuckyensis, E. inflata, and E. intermissa. Most taxa are assigned previously described American species using a cf. designation. Description and thin section illustration provide a basis for nomenclatural acceptance of these taxa.

Small fusulinids are common in the Atokan and most Desmoinesian marine units in Ohio but less common in Missourian and Virgilian units. Twenty-one taxa are recognized. Five new species are proposed, including Millerella? elegantula, Eostaffella? recondita, Eostaffella inusitata, Pseudostaffella douglassi, and Pseudoendothyra ohioensis. Several specimens of uncertain taxonomic assignment are also included.Approximately one-third of the previously recognized taxa were originally described from Europe and about one-half from western North America. Millerella? carbonica Grozdilova and Lebedeva, Eostaffella rjasanensis Rauzer-Chernousova, E. mutabilis Rauzer-Chernousova, and E. acuta Grozdilova and Lebedeva are reported from North America for the first time. The known ranges of several species have been extended significantly. These conclusions support the concept of a greater cosmopolitanism of Pennsylvanian foraminifers than has been generally recognized.