Maas, O. 1897. Die Medusen. 21st Reports on an exploration off the West Coast of Mexico, Central and South America and of the Galapagos Islands, in charge of A. Agassiz by the U.S. Fish Commission Steamer "Albatross" during 1891. Memoirs of the Museum of Comparative Zoology at Harvard College 23: 1-92, pls 1-15.
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Maas, O.
1897
Die Medusen. 21st Reports on an exploration off the West Coast of Mexico, Central and South America and of the Galapagos Islands, in charge of A. Agassiz by the U.S. Fish Commission Steamer "Albatross" during 1891
Memoirs of the Museum of Comparative Zoology at Harvard College
