A turbine comprising: a housing; a turbine shaft rotatably supported in said housing and extending along a centerline axis; and a plurality of turbine stages (96, 98) located along said turbine shaft and contained within said housing, each turbine stage (96, 98) comprising: a rotor coupled to said turbine shaft, said rotor comprising a bucket extending radially outward therefrom; a shroud, said shroud comprising: an alignment member coupled to the housing and comprising a first end, a second end, and a body extending between said first and said second ends, said second end comprising an arcuate portion configured to facilitate leakage flow downstream from the bucket; characterised in that said body comprises a first groove, and a second groove downstream from the first groove, wherein the second groove comprises: an upstream radially and circumferentially extending side wall; a downstream radially and circumferentially extending sidewall; and a circumferentially extending end wall 148 that extends axially between radially outer ends of the upstream side wall and the downstream sidewall; wherein the second end comprises a profile comprising the arcuate portion, the profile extending axially from a radially inner end of the downstream sidewall; and wherein a seal is coupled to said body to facilitate sealing a gap defined between the bucket and said body. a housing; a turbine shaft rotatably supported in said housing and extending along a centerline axis; and a plurality of turbine stages (96, 98) located along said turbine shaft and contained within said housing, each turbine stage (96, 98) comprising: a rotor coupled to said turbine shaft, said rotor comprising a bucket extending radially outward therefrom; a shroud, said shroud comprising: an alignment member coupled to the housing and comprising a first end, a second end, and a body extending between said first and said second ends, said second end comprising an arcuate portion configured to facilitate leakage flow downstream from the bucket; characterised in that said body comprises a first groove, and a second groove downstream from the first groove, wherein the second groove comprises: an upstream radially and circumferentially extending side wall; a downstream radially and circumferentially extending sidewall; and a circumferentially extending end wall 148 that extends axially between radially outer ends of the upstream side wall and the downstream sidewall; a rotor coupled to said turbine shaft, said rotor comprising a bucket extending radially outward therefrom; a shroud, said shroud comprising: an alignment member coupled to the housing and comprising a first end, a second end, and a body extending between said first and said second ends, said second end comprising an arcuate portion configured to facilitate leakage flow downstream from the bucket; characterised in that said body comprises a first groove, and a second groove downstream from the first groove, wherein the second groove comprises: an upstream radially and circumferentially extending side wall; a downstream radially and circumferentially extending sidewall; and a circumferentially extending end wall 148 that extends axially between radially outer ends of the upstream side wall and the downstream sidewall; an upstream radially and circumferentially extending side wall; a downstream radially and circumferentially extending sidewall; and a circumferentially extending end wall 148 that extends axially between radially outer ends of the upstream side wall and the downstream sidewall; wherein the second end comprises a profile comprising the arcuate portion, the profile extending axially from a radially inner end of the downstream sidewall; and wherein a seal is coupled to said body to facilitate sealing a gap defined between the bucket and said body.