>This is assuming that the largest is 15cm or 1.5mm. Do you
>all agree?
>Can anyone now help me with this tiny Drilla(?) that is only 9cm or less (or
>.9mm)?
Sylvia, I think you mean 15 mm, not 15 cm (Polygyra are not that big!). 15 cm
is not equal to 1.5 mm. It's the other way around: 15 mm = 1.5 cm. Likewise,
if it's 9 cm it's not 0.9 mm. Do you mean 9 mm or less?
A.