Source for map
download pdf - it is on figure 4 - top right hand corner - 

Lismullin
RMP No ME032:021
Inventory No 436
Site Type Souterrain
NGR 293200, 261950

Distance 40m from road realignment and 130m from proposed motorway

A section of a souterrain passage (length 5m) is built into the side of a steep ridge. It is described in the RMP files as being of dry-stone construction, corbelled towards the roof, which is lintelled, and varying in height. It was discovered in 1969, but was unstable and could not be further examined. It is situated at the foot of a ridge in a forestry plantation.

Source for text  -

the road will not be 40 metres from this souterrain - it will be 7 metres

it is also wrongly numbered in the pdf above - or else the Inventory number is wrong...?