
From ‘The Holed Stones of Cornwall’ by J T Blight, in Archaeologia Cambrensis October 1864, p292.
The stones marked are A) “At the base of the westernmost block lies the stone which Dr. Borlase speaks of as the ‘cushion or pillow.’ Twenty-one feet to the north west is another prostrate stone (B), and six feet from it an upright block (C) 3 ft 4 inx. high. From the positions of these stones it seems probable that they are the remains of a circle.”
So says Mr Blight; you would have to make your own mind up.
Image credit: J T Blight