CL65 CREW LANDED WITHOUT GETTING LNDG CLRNC FROM THE TWR.

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FORGOT TO CONTACT TWR; DUE TO THE FOLLOWING REASONS: 1) ATC TOLD US TO CONTACT TWR WHEN JOINING FINAL; BUT IT WAS ISSUED ON DOWNWIND (CLRED FOR THE VISUAL APCH). 2) THERE WAS A LOT OF NOISE COMING FROM THE CABIN; WE WERE CONCERNED THAT THE FLT ATTENDANT MAY NOT MAKE IT TO HER JUMP SEAT IN TIME. DEBRIEF -- THE FLT ATTENDANT RPTED THAT SHE DID MAKE IT TO HER SEAT; BUT IT WAS VERY CLOSE. ALSO; SHE RPTED THAT SHE GOT THE CORRECT SIGNALS FROM ME; THE CAPT; AND THAT IT WAS HER FAULT SHE SERVED ON THIS SHORT FLT. SHE KNOWS THAT I (THE CAPT) USED THE CORRECT SIGNALS AND THAT SHE WAS ALSO BRIEFED ON THE COMPANY'S STANDARD SIGNALS SINCE THERE WAS A RECENT CHANGE. SHE APOLOGIZED AND SAID IT WOULD NOT HAPPEN AGAIN. 3) WE WERE THINKING GAR NOT LNDG; BUT WHEN SHE MADE IT TO HER JUMP SEAT WE KNEW WE COULD LAND SINCE THE NOISE OF THE JUMP SEAT CONFIRMED IT. 4) AFTER 13 1/2 HRS OF DUTY; WE HAD FLOWN 6 PREVIOUS FLTS; NOW OVER 8 HRS 30 MINS AND NOW ON OUR 7TH FLT. WE WERE TIRED AND THIS VERY SHORT FLT (16 MINS; 5 AIRBORNE) DID NOT HELP. THIS INCIDENT WAS COUPLED WITH MANY INGREDIENTS; EVEN THOUGH THERE WAS NO INCIDENT INVOLVING OTHER ACFT OR ANY OTHER PROB NOTED BY ATC. I HAVE BEEN FLYING SINCE 1982 (16+ YRS) AND NOTHING LIKE THIS HAS EVER HAPPENED. I AM VERY CONCERNED BECAUSE IT ONLY TAKES 1; 2; OR 3 MORE FACTORS AND THERE IS A MAJOR ACCIDENT; AND PEOPLE DIE; BUT THEY WILL JUST BLAME THE PLTS. SUPPLEMENTAL INFO FROM ACN 411243: FACTORS WHICH I FEEL ARE RELEVANT: 1) CAPT WAS PREOCCUPIED WITH PROGRAMMING FMS AND WAS DISTR. 2) CAPT PREOCCUPIED WITH MONITORING MY FLYING; INSTRUCTING ME AS TO WHAT HE THOUGHT I SHOULD DO IN ORDER TO DSND AND SLOW (NONE OF WHICH ARE REQUIRED -- APCH WAS STABILIZED ON GS AND LOC). 3) WHEN TURNING FINAL (AT ABOUT 4 MI) LOUD NOISE FROM GALLEY WAS HEARD. FLT ATTENDANT WAS UP AFTER THE FINAL SIGNAL FOR HER TO BE SEATED. WE WERE THINKING POSSIBLE GAR. 4) WE WERE ON THE 7TH LEG OF THE DAY; WHICH WAS A 13 1/2 HR DUTY DAY. CREW FATIGUE WAS DEFINITELY A FACTOR.