C152 IN THE PATTERN AT C09; CTAF PROCS; EXPERIENCES NMAC WITH C172 ENTERING PATTERN INCORRECTLY.

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THIS WAS ABOUT THE 5TH CIRCUIT WE HAD FLOWN THAT NIGHT. THERE WERE SEVERAL OTHER PLANES IN THE PATTERN. AT THE POINT MARKED WITH AN STAR; I (THE STUDENT) HAD JUST LOOKED OVER TO THE R AND SAW A LIGHT FLASH ON. IT WAS DARK AND ONLY MAYBE 20 SECONDS BEFORE I WAS LOOKING IN THE SAME DIRECTION THIS PLANE CAME FROM. SO; AS I SAW THE LIGHT MY INSTRUCTOR SAW IT ALSO AND HE; MORE THAN MYSELF; TOOK EVASIVE ACTION WITH A QUICK STEEP TURN TO THE L AND STEEP DSCNT. THE INCOMING RWY 17L HAD MISSED US; AND NEVER SAID A WORD. OUR C152 HAD ALL EXTERIOR LIGHTS ON. I DON'T KNOW HOW HE (THE C172) DID NOT SEE US. MY INSTRUCTOR READ HIS REGISTRATION AND CALLED ON THE RADIO ASKING THE C172 HIS INTENTIONS. THE C172 RESPONDED A FULL STOP FOR RWY 18; AND HE WAS ON DOWNWIND. MY INSTRUCTOR THEN ASKED WHY THE C172 DID NOT CALL ENTERING THE PATTERN. THE C172 REPLIED THAT HE HAD. MY INSTRUCTOR AND I LOOKED AT EACH OTHER; AND BOTH OF US AGREED WE NEVER HEARD HIM CALL. THE C172 LANDED LONG ON THE 4000 FT STRIP AND TAXIED VERY SLOWLY TO THE END. HE COULD HAVE EXITED MAYBE 1000 FT FROM THE END. I MADE A SLOW APCH AFTER EXTENDING DOWNWIND; SO IT WAS A LONGER FINAL TO RWY 18 THAN USUAL. THE C172 STILL HAD NOT VACATED THE RWY SO I CALLED THE GAR. AS WE WENT AROUND WE DOUBLECHKED THE C172. THE C172 QUICKLY TAXIED OFF AS WE WENT AROUND. HE TOOK OFF; AND CALLED DEPARTING THE PATTERN TO THE N. I FLEW 2-3 MORE CIRCUITS THEN CALLED IT A NIGHT.