Rory Scannell, Cian Bohane and James Kiernan scored further tries and Scannell converted two of them, while Garryowen's reply were two penalties from Gavin.
Young Munster travelled to Templeville Road and defeated St. Mary's College 26-18. Brian Haugh was the cookies hero kicking four penalties and converting tries by Derry O'Connor and Hugh McGrath.
Cork Constitution made the long trip to County Down and defeated Ballynahinch 24-17. The visitors led 13-6 at half time and had tries from Shane O'Connor and Johnny Holland. Darragh Lyons kicked three penalties and a conversion and Holland also added a penalty.
In Division 1B relegated Shannon lost at home to Blackrock College 23-16. Richie Mullane and David O'Donovan scored tries for Shannon and Tadhg Bennett added two penalties.
Three penalties from Shane Airey was not enough for U.L. Bohemian who lost away to Terenure College 36-9.
In Division 2A, Cashel continued their unbeaten run to the season with a 26-13 home win over Banbridge.
Relegated Bruff suffered a 33-13 home defeat by NUIM Barnhall and U.C.C. were surprisingly beaten at the Mardyke by Naas 28-22. Skipper Brian Quill and Ned Hodson scored tries for the students and Sean Og Murphy kicked four penalties.
Both Highfield and Old Crescent lost away from home. Queens University defeated Highfield 27-22 and Old Wesley ran out 54-15 winners over Old Crescent at Donnybrook.
There were two Munster derby ties in Division 2B. Thomond came from 8-3 down at half time to defeat Sunday's Well 35-14 at Liam Fitzgerald Park.
Nenagh Ormond recorded a 34-17 home win over Midleton.
Ulster Bank League Division 1A: Ballynahinch 17, Cork Constitution 24;
Garryowen 13, Dolphin 30;
Lansdowne 14, U.C.D. 27;
Old Belvedere 24, Clontarf 21;
St. Mary's College 18, Young Munster 26;
Division 1B: Belfast Harlequins 21, Buccaneers 29;
Dublin University 7, Galway Corinthians 25;
Malone 20, Dungannon 10;
Shannon 16, Blackrock College 23;
Terenure College 36, U.L. Bohemian 9;
Division 2A: Ballymena 37, Galwegians 14;
Bruff 13, NUMI Barnhall 33;
Cashel 26, Banbridge 13;
City of Derry 42, Rainey Old Boys 21;
Old Wesley 54, Old Crescent 15;
Queens University 27, Highfield 22;
Seapoint 27, Bective Rangers 24;
U.C.C. 22, Naas 28;
Division 2B: Ards 28, Suttonians 27;
Boyne 22, Richmond 8;
City of Armagh 23, D.L.S.P. 17;
Greystones 30, Tullamore 36;
Navan 13, Sligo 9;
Nenagh Ormond 34, Midleton 17;
Skerries 43, Instonians 3;
Thomond 35, Sunday's Well 14;