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A very large dome, built with great care in the centre or pole, contains another small vault as it were rising out of it, and in this is a spiracle, which is right over the altar.— The City of the Sun
Just behind the eye is a smaller and more dorsal opening of the same kind, the spiracle (sp.).— Text Book of Biology, Part 1: Vertebrata
In the position of the Eustachian tube there is a passage, the spiracle (sp.— Text Book of Biology, Part 1: Vertebrata
(In the spiracle is a miniature demibranch, the pseudo-branch.— Text Book of Biology, Part 1: Vertebrata
This suggests that the spiracle is really a somewhat modified gill slit Four efferent branchials (e.br.)— Text Book of Biology, Part 1: Vertebrata
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