[plt-scheme] dot notation issue

Hi,
I have the following code..

(define (same-parity p . x)
    (define ind (remainder p 2))
    (cond ((null? x) '())
          ((= ind (remainder (car x) 2))
          (cons (car x) (same-parity p (cdr x))))
          (else (same-parity p (cdr x)))))

I thought that x would be passed in as a list however
when I run this function I get...
(require (lib "trace.ss"))
> (trace same-parity)
> (same-parity 1 2 3 4 5)
|(same-parity 1 2 3 4 5)
|(same-parity 1 (3 4 5))

What is going on here?

Thanks!
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