@article {118, title = {Report on the deep-sea medus{\ae} dredged by H.M.S. Challenger during the Years 1873-1876}, journal = {Report of the Scientific Results of the Voyage of the H.M.S. Challenger during the years 1873-76; Zoology Part XII}, volume = {Volume 4 (1882)}, year = {1881}, month = {1981}, pages = {1-154, with 32 plates}, type = {Expedition report - monograph}, url = {http://www.19thcenturyscience.org/HMSC/HMSC-Reports/Zool-12/README.htm}, author = {Haeckel, Ernst} }