studies on marine Oslracods o 



Only two of the species from tlie ,,M i c h a el S a r s" (see Gigantocypris Miilleri and 

 Cyfridina (Macrocyp'rklina) castanea) have been treated in the present work. All the other 

 Ostracod species of this expedition will be treated in a special work that I am preparing. 



The first impulse to my studies of the marine Ostracods came from my highly esteemed 

 teacher, Professor A. Appbllof, Upsala. It is with real pleasure that I take this opportuiiity 

 of expressing to him my sense of gratitude — which has become more and more profound in 

 the course of years — for the untiring interest with which he has followed the development 

 of my work and for the never failing kindness and sympathy he has shown me on the numerous 

 occasions when it was necessary to ask for his help. 



To Professor A.. WiREN, the head of the Zoological Institution of the University of 

 Upsala, where, as I pointed out above, the greater part of this work was carried out, I beg to 

 express my gratitude for all his kindness and interest during the past years. 



At the same time I wish to thank the following persons as well for the help they have 

 rendered me in connection with this work: Professor H. Theel and Phil. Dr. N. Odhner, Swedish 

 State Museum, Stockholm, Dr. H. Ostehgren, Kristineberg, Professors G. 0. Sars and 

 T. Odhner. Christiania, Professors G. W. Muller and G. S. Brady, Dr. M. v. Davidoff, 

 Laboratoire Russe de Zoologie, Villefranche-sur-Mer, Dr. J. Richard, Musee Oceanographique 

 de Monaco, Mr. HENRY ALEXANDER, lecturer in English at the University of Upsala (for his 

 skilful and untiring work in translating the present work), Herr G. LlUEVALL (drawings of 

 some figures; see Philomedes (Scleroconcha) Appellofi), Herr J. W. Engeund (Indian ink 

 reproductions of most of my drawings of the group Cypridiniformes), Froken Amy Wastfelt 

 (Indian ink reproductions of my drawings of the Halocypriformes and Polycopiformes, some 

 of the figures of the Cypridiniformes and all the figures in the general part of this work) 

 and Froken Gerda Jungberg (the first two drawings of Cypridina (Siphonostra) spinifera). 



Finally I wish to tender my heartfelt thanks to Herr H. Mannhei.MER, Bank Director, 

 of Gothenburg. Owing to the present difficult conditions and the abnormally high prices, the 

 printing of this treatise seemed almost impossible, and it is only because this exceedingly 

 generous benefactor stepped in and, together with some friends of his, made the financial side 

 secure that I have been able to have it printed. 



