Wikipedia
Caulophacus
thumb|right|Caulophacus elegans, illustration in: Report on the scientific results of the voyage of H.M.S. Challenger during the years 1873-76 - under the command of Captain George S. Nares, R.N., F.R.S. and Captain Frank Turle Thomson, R.N. (1887). Caulophacus is a genus of glass sponges belonging to the subfamily Lanuginellinae.