CHARTER PLT LANDS WITH GEAR RETRACTED.

Narrative

I DEPARTED BETHEL UNDER SVFR. BETHEL ATIS RPTED WTL 500 FT AND 10 MI. RPTED 1000 FT AND 10 MI. ENRTE WX VARIED RAGGED 500-700 FT 2-10 MI. PAX CHOSE TO SIT IN BACK SEAT R SIDE. TKOF AND ENRTE WERE UNEVENTFUL. UPON REACHING WTL; WINDS WERE OUT OF THE WNW ABOUT 15 KTS FAVORING 2. I ENTERED L TFC AND REDUCED PWR APPROX 21 INCHES MP; SELECTED 10 DEGS FLAPS. AFTER TURNING FINAL I REDUCED PWR TO APPROX 15 INCHES MP; SELECTED FLAPS 30 DEGS AND STABILIZED THE APCH. A GRADUAL PWR REDUCTION WAS INITIATED TOWARD THE END OF THE RWY. UPON ROUNDOUT IN GND EFFECT I NOTICED UNUSUAL SETTLING. I REALIZED I HAD NOT EXTENDED THE GEAR. THE ACFT ALREADY SETTLING ON TO THE RWY THERE WAS NO TIME TO INITIATE A GAR; THEREBY SLIDING TO A STOP STRAIGHT AHEAD ON CTRLINE. AFTER REALIZING WHAT HAD TAKEN PLACE; I TURNED OFF ALL ELECTRICAL SWITCHES AND EVACED THE PAX AND MYSELF FROM THE ACFT. THE USE OF THE CHKLIST IS OF UTMOST IMPORTANCE. THIS INCIDENT COULD HAVE BEEN AVOIDED HAD IT BEEN USED. IN THE CASE OF FAIL-SAFE EQUIP (GEAR HORN). THE INTENSITY AND DECIBEL LEVEL COULD BE INCREASED FOR OTHER AUDIBLE DISTRS. PERHAPS AN ADDITIONAL (LIGHTS) IN THE PANEL DIRECTLY IN FRONT OF PLT. CHKLIST USAGE CANNOT BE COMPROMISED.