The Royal College 1840

Descriptive and illustrated catalogue of the physiological series of comparative anatomy contained in the museum of The Royal College of Surgeons in London, vol. V, Londres, R. and J. E. Taylor, 1840.


The artificial larval case of the Caddis-fly (Phryganea grandis, Latr.).
It is a cylindrical tube, formed of small grains of sand, cemented together by a secretion of the larva, analogous to silk, and strengthened by longitudinal pieces of stick. The tube is open at both ends for the entry of water ; and the larva, which lives under water, always transports its domicile along with it.

Several of the artificial larva cases of the Caddis-fly (Phryganea).