Rainey strained his gaze to catch the steamy spiracle and the outthrust of the great head.
"A Man to His Mate"
J. Allan Dunn
As they passed the door on the other side of the little gallery-down whose spiracle had come no second breath-Donal said to himself he must question that door, but to Arctura he said nothing: she had had enough of inquiry for the moment!
"Donal Grant"
George MacDonald
A stage with a reduced spiracle does not proceed in development from a preceding stage in which the spiracle shows no reduction: it is reduced at its first appearance.
"Darwin and Modern Science"
A.C. Seward and Others