Taxonomic Studies on the Hydras of North America. VII. Description of Chlorohydra hadleyi, new species, with a Key to the North American Species of Hydras

Helen Forrest, Taxonomic Studies on the Hydras of North America. VII. Description of Chlorohydra hadleyi, new species, with a Key to the North American Species of Hydras, The American Midland Naturalist, Vol. 62, No. 2 (Oct., 1959), pp. 440-448