Quarterland

A Quarterland or Ceathramh (Scottish Gaelic) was a Scottish land measurement. It was used mainly in the west and north.
It was supposed to be equivalent to eight fourpennylands, roughly equivalent to a quarter of a markland. However, in Islay, a quarterland was equivalent to a quarter of an ounceland. Half of a quarterland would be an "ochdamh"(ie.one-eighth), and in Islay a quarter of a quarterland a "leothras"(ie.one-sixteenth).
The name appears in many Scottish placenames, notably Kirriemuir. 
"Ceathramh" was also used in Gàidhlig for a bushel and a firlot (or four pecks), as was "Feòirling", the term used for a farthlingland.
Isle of Man.
The Isle of Man retained a similar system into historic times: in the traditional land divisions of treens (c.f. the Scottish Gaelic word "trian", a third part) which are in turn subdivided into smaller units called quarterlands.