full-grown spécimens of both sexes lias enabled me to point 

 out différence according to âge and sex in some fonîis and 

 to prove the invalidity of some specîes established in the 

 literature. Ail species are enumerated here and the new species 

 described, excepting one new from, the material of which is 

 rather mutilated. I beg my friend Dr. W. T. Caïman accept 

 m y sincère thanks for having answered some questions as to 

 structural features in some of the types of Sars preverved in the 

 British Muséum (Natural History). 



The Schizopoda consist of two Orders, Mysidacea and 

 Euphausiacea, which in reality are far from being closely 

 related to each other. I préserve here the old dénomination, 

 Schizopoda, as brief and rather practical, but it may be 

 emphasized that I do not consider the group a natural one; of 

 its two orders the Mysidacea are rather related to the Lepto- 

 straca, and more akin to Cumacea and Tanaidacea than to the 

 Euphausiacea, which are allied to the Decapoda. The Mysi- 

 dacea have been correctly divided (by Boas) into two suborders: 

 Lophogastrida and Mysida. 



In this contribution I quote only rather few papers, among 

 wiiich that by Sars is the principal work on the order Euphau- 

 siacea and the suborder Lophogastrida ; the quotations given 

 will be- sufïicient for every student of the group, as I refer to 

 the best description of each species, omitting preliminary papers 

 of the same authors and other contributions of lesser value. 

 The titles of the three most important works are given here, 

 so that the majority of the quotations on the following pages 

 can be very brief. 



G. O. Sars : Report on the Schizopoda collected by H. M. S. 

 Challenger. Zool. Challenger Exp., Part, xxxvn. , Vol. 

 xm, i885. 



A. Ortmann : Decapoden nnd Schi\opoden der Plankton 



Expédition. Ergebnisse der f PLANKTON-Exped. der Hum- 



30L£>r-Stiftung, B. n, G. b., 1893. 

 C. G hun : Atlantis. Biologische Studien ïïber pelag. Organis- 



men\ Fûnftes Kapitel. Ueber pelag. Tiefsee-Schi\opoden. 



Bibliotheca Zoologica, B. 7, Heft. 19, 1896. 



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