ihe Amphipoda Hyperiidea, the object of the present treatise, have been very mnch 

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

 gi-aphically. The most iraportant contributions to our knowledge of thein have been 

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

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

 to identify them with the ah-eady known forms. The result has been an ahnost in- 

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

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

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



Throngh the great benevolence of Professor Sven Loven") and Professor Japetus 

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

 These materials were afterwards inci-eased by the kindness of Professor Tyciio Tullberg '') of 

 Upsala, Professor Ci-ir. F. Lutken'') of Copenhageii, Professor Alpiionse Milne Edwards") 

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



') H. Milne Edwards. Extrait de RechercUes poiir servir a THistoire naturelle des Crustacés amphipodes. 

 (Annales des Sciences naturelles. Torne 20""^, p, .385—399). 1830. — H. Milne Edwards. Histoirc nuturelle 

 des Crustacés. Torne S"», 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. Fel. — C. Spence 

 Bate. Catalogue of tlie specimens of Ainpliipodoiis Crnstacea in the oollection of the British Museum, p. 284 — 

 34G. London 1862. 8:o. — C. Claus. Der Organismus der Phroniniiden, and Die Gattungen und Arten der 

 Platysceliden. (Arbeitcn nus dem Zoologischen Institute der Universität Wien und der Zoologischen Station in 

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



'^) The Hyperiidean collection of the Zoological State Museum at Stockholm consists.principally of precious 

 specimens oaptured by Professor H. Kinberg during the circumnavigation of the R. Swed. Prigate Eugenie 1851 — 

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

 with the coUections of the Museum. 



•*) 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 oft' Greenland are well represented, from the Pacific 

 and the Indian Ocean tliere are comparatively few species. 



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

 George von Schéele, one of the raost 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. 



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



^) Probably the raost precious collection of all, as it contains some of the types of the new species 

 described by H. Milne Edwards, Gu érin-Méne ville, and Spence Bate. 



') Some Mediterranean species, collected by Professor Leche himself at Messiua. 



*) Mostly Pacific specimens from the Museum Godeffroy. 



K. Vet. Akad. Handl. Band. 21. N:o 5. ^ 



