Amusium bocasensis Olsson, 1922 † accepted as Amusium bocasense Olsson, 1922 † (original description)
Ancistrosyrinx dalli Olsson, 1922 † (original description)
Borsonia cocoensis Olsson, 1922 † accepted as Paraborsonia cocoensis (Olsson, 1922) † (original description)
Cancellaria plummeri Olsson, 1922 † accepted as Ventrilia plummeri (Olsson, 1922) † (original description)
Cancellaria toroensis Olsson, 1922 † accepted as Ventrilia toroensis (Olsson, 1922) † (original description)
Crepitacella limonensis Olsson, 1922 † accepted as Microstelma limonensis [sic] † accepted as Microstelma limonense (Olsson, 1922) † (original description)
Cythara terminula var. costaricensis Olsson, 1922 † accepted as Lepicythara heptagona (Gabb, 1873) (original description)
Drillia aquaensis Olsson, 1922 † (original description)
Drillia aquanica Olsson, 1922 † (original description)
Drillia aurantia Olsson, 1922 † (original description)
Drillia bocasensis Olsson, 1922 † (original description)
Drillia bocatoroensis Olsson, 1922 † accepted as Carinodrillia bocatoroensis (Olsson, 1922) † (original description)
Drillia carruca Olsson, 1922 † (original description)
Drillia chiriguiensis Olsson, 1922 † (original description)
Drillia citria Olsson, 1922 † (original description)
Drillia coccos Olsson, 1922 † (original description)
Drillia cocosina Olsson, 1922 † (original description)
Drillia cristobali Olsson, 1922 † (original description)
Drillia estrellana Olsson, 1922 † (original description)
Fasciolaria macdonaldi Olsson, 1922 † accepted as Aurantilaria macdonaldi (Olsson, 1922) † (original description)
Fusus miocosmius Olsson, 1922 † accepted as Aristofusus miocosmius (Olsson, 1922) † (original description)
Glycymeris castaneus (Lamarck, 1819) accepted as Glycymeris undata (Linnaeus, 1758) (basis of record)
Leucosyrinx chloris Olsson, 1922 † (original description)
Pecten (Aequipecten) preglyptus Olsson, 1922 † accepted as Amussiopecten preglyptus (Olsson, 1922) † (original description)
Pecten (Pseudamusium) almirantensis Olsson, 1922 † accepted as Cyclopecten almirantensis (Olsson, 1922) † (original description)
Pecten (Pseudamusium) aotus Olsson, 1922 † accepted as Cyclopecten aotus (Olsson, 1922) † (original description)
Pecten coralliphila Olsson, 1922 † (original description)
Pecten costaricensis Olsson, 1922 † accepted as Argopecten uselmae (Pilsbry & C. W. Johnson, 1917) † (original description)
Pecten macdonaldi Olsson, 1922 † accepted as Leopecten macdonaldi (Olsson, 1922) † (original description)
Protocardia costaricensis Olsson, 1922 † (original description)
Sconsia laevigata var. gabbi Olsson, 1922 accepted as Sconsia grayi A. Adams, 1855 (original description)
Semele laevis var. costaricensis Olsson, 1922 accepted as Semele laevis (G. B. Sowerby I, 1833) (original description)
Siliquaria modesta var. limonensis Olsson, 1922 accepted as Tenagodus modestus (Dall, 1881) (original description)
Spondylus chiriquiensis Olsson, 1922 † (original description)
Strombina sincola Olsson, 1922 † accepted as Sincola sincola (Olsson, 1922) † (original description)
Turbo saltus Olsson, 1922 † (original description)
Turricula lavinoides Olsson, 1922 accepted as Fusiturricula lavinoides (Olsson, 1922) (original description)
Turricula lavinoides var. limonensis Olsson, 1922 † accepted as Fusiturricula lavinoides (Olsson, 1922) (original description)
Turricula taurina Olsson, 1922 † accepted as Fusiturricula taurina (Olsson, 1922) † (original description)
Turritella altilira Conrad, 1857 † (additional source)
Turritella altilira var. chiriquiensis Olsson, 1922 † accepted as Turritella altilira chiriquiensis Olsson, 1922 † (original description)
Turritella altilira var. costaricensis Olsson, 1922 † accepted as Turritella altilira costaricensis Olsson, 1922 † (original description)
Typhis linguiferus var. costaricensis Olsson, 1922 accepted as Laevityphis costaricensis (Olsson, 1922) † (original description)
Venericardia terryi Olsson, 1922 † (original description)

Costa Rica for Amusium bocasensis Olsson, 1922 † 
Costa Rica for Fasciolaria macdonaldi Olsson, 1922 † 
Costa Rica for Pecten (Aequipecten) preglyptus Olsson, 1922 † 
Costa Rica for Pecten (Pseudamusium) almirantensis Olsson, 1922 † 
Costa Rica for Pecten (Pseudamusium) aotus Olsson, 1922 † 
Costa Rica for Pecten coralliphila Olsson, 1922 † 
Costa Rica for Pecten costaricensis Olsson, 1922 † 
Costa Rica for Pecten macdonaldi Olsson, 1922 † 
Costa Rica for Spondylus chiriquiensis Olsson, 1922 † 
Costa Rica for Turbo saltus Olsson, 1922 † 
Costa Rica for Turritella altilira var. chiriquiensis Olsson, 1922 † 
Costa Rica for Turritella altilira var. costaricensis Olsson, 1922 † 
Panama for Fusus miocosmius Olsson, 1922 †