1. INTRODUCTION  
2. THE DATA  
3. LIGHT CURVE MODELING  
3.1. Velocity Measurements at Peak Phases  
3.2. Light Curve Modeling  
4. LIGHT CURVE MORPHOLOGIES  
4.2. Undulations in the Light Curves  
4.3. Time Scales and Energetics of LC Undulations  
4.4. Correlations  
4.5. Optical Colors at Bump Phases  
4.6. LC Undulations in Helium-rich SLSNe-Ib  
5. DISCUSSION  
5.1. What Drives LC Undulations Among SLSNe-I?  
5.2. Prevalence of H-poor CSM in SLSNe-I  
5.3. Comparison with H22  
6. SUMMARY