For example, in the case of the townland Carrownphull in Co. Longford, although there are three plots indicated, the acreage of No. 1 and 2 covers 90% of the townland. The value is rated between 12 and 14 shillings per acre. A slight difference like this wouldn't indicate a dramatic difference in crop potential or easy of labor on the land. Plot No. 3 likely fell on the border of a neighboring townland.
In light of this logic it stands to reason that if your ancestors lived in Carrownphull, they lived on land valued 12s. 6d. to 14s. per statute acre.
In this way we are able to discern the value of their land, despite the fact that their names aren't listed.