linux - TCSH foreach Syntax error: "(" unexpected -

so have basic script:

foreach x (*.nii)          mri_convert -i $x -o $x:r.mgz -it nii -ot mgz end 

in essence, should change file type of .nii files .mgz. when run in tcsh, receive:

./test1: 1: ./test1: syntax error: "(" unexpected 

i unsure why getting error, correct syntax foreach typically:

foreach x (1 2 3)       echo $x end 

am mistaken?