Companion Terms for 7 and 8 (Re: 'eight' some more)

[Koontz John E]

On Wed, 5 May 2004, Mary Marino wrote:
> Fr Valentin Vegreville gives the form caGuweG  for "seven".  (His head
> entry is Sept, ou sept fois)  (G = g with a superscript dot, which I take
> to be a velar fricative)    He compiled his 'Lexique' , seemingly, in
> 1876-77 when he was at the Lac-Ste-Anne parish in Alberta.  The form is
> presumably Stoney, though he himself uses the term Assiniboine.   "Six ou
> six fois"  is caGpeG.   His <c>, by the way, = s^.

I meant to ask about the final -G in these numerals.  What does it
represent?