Samuel H. Scudder, « An account of some insects of unusual interest from the Tertiary rocks of Colorado and Wyoming », Bulletin of the United States Geological and Geographical Survey of the Territories, Washington, Government Printing Office, vol. 41, 1878, p. 543.

In certain parts of Auvergne, France, rocks are found, which, for a thickness of sometimes two meters are wholly made up of the remains of the cases of caddis-flies. These have been frequently mentionned by writers, and Sir Charles Lyell figures them in his Manual. Oustalet, in his recent treatise of the fossil insects of Auvergne, describes two forms, one from Clermond, and the other from St Gérand, which he distinguishes under the names Phryganea corentina and P. gerandinae, principally from their difference in size and strength, and a distinction in the minute shells- species of Paludina– of which the cases are composed. One of them, however, probably the former was previously named by Giebel Indusia tabulata, a generic name which it would perhaps be well to employ for the cases of extinct Phryganidae, until they can reasonably by referred to particular genera.