Three species new to science are described:Gastrosaccus psammodytesand two species that belong either to the genusMysidopsisor to a closely allied genus. Five of the species in the collection are new records for South African waters; these considerably extend the known geographical range:Siriella jaltensisCzerniavsky,Gastrosaccus dunckeriZimmer,Afromysis hansoniZimmer,Afromysis australiensisTattersall, andAcanthmysis indica(Tattersall).