Note to others: I found my grandmother's birth registry record for the Superintendent's Registrar District of Tulla, classified on civilrecords.irishgenealogy.ie as being in the Civil Registration District/Office of "Galway". She was born in Knockatunna, Feakle Civil Parish, Barony of Tulla Upper, but one needed to look under Galway to find it. The image clearly shows Tulla as the Superintendent Registrar's District. My grandfather was born in Gortavrulla, part of the Scarriff Civil Registration District/Office, and there no problems with his records.
civilrecords.irishgenealogy.ie allows users to recommend report errors in transcription but not for the SR District/Reg Area (a.k.a. Civil Registration District/Office). Other records for family members are similarly classified as "Galway", instead of "Tulla".