1. Introduction
2. Observations and Data Reduction
3. Sample
4. Results
4.1. HI Br γ Line Spectral Signal
4.2. Continuum-Subtracted Br γ Line Visibilities and Differential Phases
4.3. The Size of the Br γ Line-Emitting Region
4.4. Br γ Line Displacements
4.5. HD 45677
5. Discussion
5.1. Relation to the Dusty Disk
5.2. The Kinematics of the Innermost Region
5.3. The Origin of the H I Br γ Line Emission
6. Summary and Conclusions