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JLhe Amphipoda Hyperiidea, the object of the present treatise, have been very much 

 neglected by Zoologists, and, as a whole, they have not hitherto been treated mono- 

 graphically. The most important contributions to our knowledge of them have been 

 afforded by H. Milne Edwards, J. D. Dana, C. Spence Bate and C. Claus 1 ). Many 

 new species have also been described by others, too often, however, without any attempt 

 to identify them with the already known forms. The result has been an almost in- 

 extricable confusion of the synonymy, not redeemed by the peremptory manner in which 

 names given by previous authors have been cleared away. I shall do my best to retain 

 as much as possible of genera and species established by my predecessors. 



Through the great benevolence of Professor Sven Loven 2 ) and Professor Japetus 

 Steenstrup 3 ), I have obtained very large materials for the elaboration of this monograph. 

 These materials were afterwards increased by the kindness of Professor Tycho Tullberg 4 ) of 

 Upsala, Professor Chr. F. Lutken 5 ) of Copenhagen, Professor Alphonse Milne Edwards 6 ) 

 of Paris, Professor Wilhelm Leche 7 ) of Stockholm and D:r C. Cruger s ) of Hamburg. 



') H. Milne Edwards. Extrait de Recherches pour servir a l'Histoire naturelle des Crustaces amphipodes. 

 (Annales des Sciences naturelles. Tome 20 me , p, 385-399). 1830. — H. Milne Edwards. Histoire naturelle 

 des Crustaces. Tome 3 me , p. 70 — 102. Paris 1840. 8:o. — J. D. Dana. United States Exploring Expedi- 

 tion. Crustacea. Vol. 2, p. 833—836, 978—1018 and 1442—1443. Philadelphia 1852. Fol. - - C. Spence 

 Bate. Catalogue of the specimens of Aniphipodous Crustacea in the collection of the British Museum, p. 284^ 

 346. London 1862. 8:o. — - C. Claus. Der Orgauismus der Phronimiden, and Die Gattungen und Arten der 

 Platysceliden. (Arbeiten aus dem Zoologischen Institute der Universitat Wien und der Zoologischen Station in 

 Triest. Tom. 2, p. 59—146 and 147—198). 1879. - - C. Claus. Die Platysceliden. Wien 1887. 4:to. 



2 ) The Hyperiidean collection of the Zoological State Museum at Stockholm consists principally of precious 

 specimens captured by Professor H. Kinberg during the circumnavigation of the R. Swed. Frigate Eugenie 1851 — 

 53, and of northern and arctic species in hundreds of examples. Lately my own collection has been incorporated 

 with the collections of the Museum. 



3 ) The Hyperids of the University Museum at Copenhagen form certainly one of the largest Hyperiidean 

 collections in the world. The Atlantic regions and the seas off Greenland are well represented, from the Pacific 

 and the Indian Ocean there are comparatively few species. 



*) From the Zoological Museum of Upsala I got a very interesting collection made by the late Captain 

 George von Scheele, one of the most zealous collectors I have met with. His death last year in a hurricane 

 off the east coast of Africa, was a great loss to zoological science. The specimens are principally from the 

 southern Atlantic, southwestern Pacific, and the seas around Australia. 



5 ) An additional collection from the University Museum at Copenhagen. 



6 ) Probably the most precious collection of all, as it contains some of the types of the new species 

 described by H. Milne Edwards, Guerin-Meneville, and Spence Bate. 



7 ) Some Mediterranean species, collected by Professor Leche himself at Messina. 



8 ) Mostly Pacific specimens from the Museum Godeffroy. 



K. Vet. Akad. Handl. Baud. 21. M:o 5. 1 



