Acteon nitidus Stephenson, 1941 † (original description)
Acteon throckmortoni Stephenson, 1941 † (original description)
Akera constricta Stephenson, 1941 † (original description)
Aliofusus Stephenson, 1941 † (original description)
Aliofusus reagani Stephenson, 1941 † (original description)
Amuletum Stephenson, 1941 † (original description)
Amuletum boylei Stephenson, 1941 † (original description)
Amuletum ripleyanum (Wade, 1926) † (new combination reference)
Amuletum venustum Stephenson, 1941 † (original description)
Anchura bexarensis Stephenson, 1941 † (original description)
Anchura caddoensis Stephenson, 1941 † (original description)
Anchura campbelli Stephenson, 1941 † (original description)
Anchura cooki Stephenson, 1941 † (original description)
Anchura lamari Stephenson, 1941 † (original description)
Anchura lynnensis Stephenson, 1941 † (original description)
Anchura noackensis Stephenson, 1941 † (original description)
Anomalofusus bellulus Stephenson, 1941 † (original description)
Aphrodina navarroana Stephenson, 1941 † (original description)
Architectonica voragiformis Stephenson, 1941 † (original description)
Astarte culebrensis Stephenson, 1941 † (original description)
Astartemya Stephenson, 1941 † (original description)
Astartemya fentressensis Stephenson, 1941 † (original description)
Banis Stephenson, 1941 † (original description)
Banis siniformis Stephenson, 1941 † (original description)
Bellifusus Stephenson, 1941 † (original description)
Bellifusus buffaloensis Stephenson, 1941 † (original description)
Bellifusus coronatus Stephenson, 1941 † (original description)
Bellifusus crassicostatus Stephenson, 1941 † (original description)
Bellifusus deatsvillensis Stephenson, 1941 † (original description)
Bellifusus multicostatus Stephenson, 1941 † (original description)
Bellifusus robustus Stephenson, 1941 † (original description)
Belliscala Stephenson, 1941 † (original description)
Belliscala crideri Stephenson, 1941 † (original description)
Belliscala forsheyi (Shumard, 1862) † (basis of record)
Belliscala rockensis Stephenson, 1941 † (original description)
Beretra Stephenson, 1941 † (original description)
Beretra contracta Stephenson, 1941 † (original description)
Beretra elongata Stephenson, 1941 † (original description)
Beretra firma Stephenson, 1941 † (original description)
Beretra ornatula Stephenson, 1941 † (original description)
Beretra striata Stephenson, 1941 † (original description)
Brevicardium Stephenson, 1941 † (original description)
Brevicardium fragile Stephenson, 1941 † (original description)
Brevicardium guadalupense Stephenson, 1941 † (original description)
Brevicardium marcosense Stephenson, 1941 † (original description)
Brevicardium tenue Stephenson, 1941 † (original description)
Cadulus coonensis Stephenson, 1941 † (original description)
Calliomphalus bellulus Stephenson, 1941 † (original description)
Calliomphalus microcancelli Stephenson, 1941 † (original description)
Cancellaria matsoni Stephenson, 1941 † (original description)
Capulus cuthandensis Stephenson, 1941 † (original description)
Capulus erectus Stephenson, 1941 † (original description)
Capulus microstriatus Stephenson, 1941 † (original description)
Cardiaster leonensis Stephenson, 1941 † (original description)
Caveola Stephenson, 1941 † (original description)
Caveola producta Stephenson, 1941 † (original description)
Cerithium simpsonense Stephenson, 1941 † (original description)
Corbula inflata Stephenson, 1941 † (original description)
Corbula linteroidea Stephenson, 1941 † (original description)
Corbula rockensis Stephenson, 1941 † (original description)
Corbula torta Stephenson, 1941 † (original description)
Corbula woodi Stephenson, 1941 † (original description)
Crassatella quinlanensis Stephenson, 1941 † (original description)
Creonella deusseni Stephenson, 1941 † (original description)
Creonella whitei Stephenson, 1941 † (original description)
Cuneolus Stephenson, 1941 † accepted as Lycettia L. R. Cox, 1937 † (original description)
Cuneolus lanceolatus (J. De C. Sowerby, 1823) † accepted as Lycettia lanceolata (J. De C. Sowerby, 1823) † (basis of record)
Cuneolus tegulatus (J. Müller, 1847) † accepted as Lycettia tegulata (J. Müller, 1847) † (basis of record)
Cuneolus tippanus (Conrad, 1858) † accepted as Lycettia tippana (Conrad, 1858) † (basis of record)
Cuspidaria grandis Stephenson, 1941 † (original description)
Cuspidaria grovensis Stephenson, 1941 † (original description)
Cyclorisma pumila Stephenson, 1941 † (original description)
Cylichna incisa Stephenson, 1941 † (original description)
Cymbophora cancellosa Stephenson, 1941 † (original description)
Cymbophora inflata Stephenson, 1941 † (original description)
Cymbophora scabellum Stephenson, 1941 † (original description)
Cymbophora simpsonensis Stephenson, 1941 † (original description)
Cymbophora subtilis Stephenson, 1941 † (original description)
Cypraea gracilis Stephenson, 1941 † (original description)
Cypraea nuciformis Stephenson, 1941 † (original description)
Cyprimeria coonensis Stephenson, 1941 † (original description)
Dentalium navarroi Stephenson, 1941 † (original description)
Dentalium vaughani Stephenson, 1941 † (original description)
Deussenia Stephenson, 1941 † (original description)
Deussenia ciboloensis Stephenson, 1941 † (original description)
Deussenia corbis Stephenson, 1941 † (original description)
Deussenia multilirae Stephenson, 1941 † (original description)
Deussenia travisana Stephenson, 1941 † (original description)
Drepanochilus corbetensis Stephenson, 1941 † (original description)
Drepanochilus martini Stephenson, 1941 † (original description)
Drepanochilus texanus Stephenson, 1941 † (original description)
Drepanochilus triliratus Stephenson, 1941 † (original description)
Drilluta brevispira Stephenson, 1941 † (original description)
Drilluta distans (Conrad, 1860) † (additional source)
Drilluta paucicostata Stephenson, 1941 † (original description)
Ellipsoscapha Stephenson, 1941 † (original description)
Ellipsoscapha mortoni (Forbes, 1845) † (new combination reference)
Ellipsoscapha striatella (Shumard, 1862) † (new combination reference)
Eoancilla Stephenson, 1941 † (original description)
Eoancilla acutula Stephenson, 1941 † (original description)