Exactly like the wheel-windows of a Gotic building

« Nature’s Teachings », The Juvenile Instructor, vol. 14, n° 3, Salt Lake City, 1° février 1879,
& Chamber’s Journal, vol. 55, 1878, & The popular science monthly, vol. 12, 1878.

The caddis-worm, common in all our fresh waters, constructs for itself a circular window-grating which admits the water and yet protects the pupa from injury, an apparatus exactly like the wheel-windows of a Gothic building.