LANDED WITHOUT CLRNC AND FAILED TO CALL TWR ADVISING REACHING GATE.

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LANDED FROM INST APCH WITHOUT CONTACTING TWR. WAS CAPT'S LEG TO FLY. COMPANY PROCS REQUIRE; IF RVR BELOW 4000 FT; THAT FO FLY APCH; STAY ON INSTS; CAPT TO GO OUTSIDE AND LAND ACFT IF CONDITIONS PERMIT. PROCS STATE THAT CAPT INITIATE APCH; GIVE ACFT TO FO ESTABLISHED ON GS. IN THAT TRANSITION; CHANGING CTL OF ACFT WE WERE TOLD TO GO TO TWR. WE DID SWITCH FREQS. AFTER FINAL LNDG CHKLIST THE CAPT ASKED IF WE HAD CLRNC TO LAND. FO REPLIED AFFIRMATIVE; AN INSURING CALL WAS NOT MADE. AFTER LNDG; TWR CALLED TO STATE THAT RADIO CONTACT HAD NOT BEEN MADE AND CLRNC NOT ISSUED. WE WERE CONCENTRATING ON THE APCH AND APPARENTLY MISSED THE CALL TO THE TWR. A FOLLOW UP CALL COULD HAVE BEEN MADE SINCE ONE CREW MEMBER QUESTIONED CLRNC. BOTH CREW MEMBERS COMMUTE. THE DAYS SCHEDULED EVENTS STARTED WITH 2 DEAD HEAD FLTS. CHK IN WAS XA55. FIRST PUSH BACK WAS XG30. EVENT OCCURRED AT XL10. BOTH CREW MEMBERS COMMUTED IN PRIOR TO CHK IN LENGTHENING DAY TO 14 PLUS HRS. DAYS THAT START WITH DEADHEADS (INCLUDING COMMUTING) ADD TO ACTUAL DUTY DAY. THEY ALSO HAVE A PSYCHOLOGICAL EFFECT THAT SEEMS TO LENGTHEN THE DAY WHEN ON THE SCHEDULE. SCHEDULING HERE IS BECOMING A MAJOR PROBLEM. BESIDES DEADHEAD FATIGUE; AM/PM MIXES ON SCHEDULES AFFECT THE BODY CLOCK INCREASING THE FATIGUE FACTOR. SUPPLEMENTAL INFO FROM ACN 197183. CALLED TWR ON THE ROLL OUT (THEY COULDN'T SEE US) AND THEY SAID RPT AT THE GATE. WELL; I FORGOT TO CALL AT THE GATE AND THEY CALLED OKC; FLT OPS AND TALKED TO CAPT.