Huxley, Th.H., 1859. The oceanic Hydrozoa; a description of the Calycophoridae and Physophoridae observed during the voyage of H.M.S. "Rattlesnake", in the years 1846-50.
The oceanic Hydrozoa : a description of the Calycophoridæ and Physophoridæ observed during the voyage of H.M.S. "Rattlesnake," in the years 1846-1850 / by Thomas Henry Huxley