Warrington's hooker Jon Clarke, 28, is the oldest and most unlikely of the Wigan rejects and as one of two specialist hookers, along with St Helens's James Roby, looks likely to start.
Although they are all dressed as men, there is some variety among the male hookers along Reforma.
Especially as Agustín brought his hooker "friend" along for the ride (cough).
Some also called her the Highway Hooker, because she worked along Interstate 75.
Umaga, along with hooker Keven Mealamu, upended the Lions captain in the opening minute of the first Test in Christchurch, which resulted in O'Driscoll dislocating his shoulder.
Prop Marler, along with hooker Joe Gray, full-back Mike Brown and Lions wing Ugo Monye, helped Harlequins to victory in the European Challenge Cup final against Stade Francais in Cardiff on Friday, while fly-half Rory Clegg - also included in the England squad - was an unused replacement.
"He's been fighting for that hooker berth with Ken Owens all along and this is a deserved opportunity for Emyr.
Ireland's Six Nations campaign has been beset by injuries with regular starters Paul O'Connell, Tommy Bowe and Stephen Ferris ruled out before the start of the tournament along with Leinster hooker Richardt Strauss.
Three other long-serving players are heading for the exit - fly-half Phil Godman, hooker Andrew Kelly and flanker Alan MacDonald - along with front rowers Kyle Traynor and Jack Gilding and Argentine lock Esteban Lozada.
Gloucester's Hamilton, who has 34 Scotland caps, was suspended by the Rugby Football Union along with London Irish hooker David Paice.
