The air gains access to these tubes through a number of paired air-holes or spiracles, arranged segmentally in series.
"The Life-Story of Insects"
Geo. H. Carpenter
These facts were blocks of clay whose under sides were hollowed segmentally and covered with a coat of stucco.
"A History of Art in Chaldæa & Assyria, v. 1"
Georges Perrot Charles Chipiez