24 DISCOVERY REPORTS 



The Mysida in some cases show traces of primitive characters as, for example, the presence of 

 pleural plates on the first abdominal somite of the females in the Gastrosaccinae, and of the males in 

 the genus Rhopalophthalmas, and the absence of a statocyst in the Petalophthalmidae. 



The classification of the Mysidacea adopted in the present work is that drawn up by Hansen (19 10, 

 pp. 8-77), in which the more primitive forms are considered first and the more complex later 

 according to their degree of specialization. 



LIST OF MYSIDACEA IN THE DISCOVERY COLLECTIONS 

 ARRANGED IN SYSTEMATIC ORDER 



(with synonymies) 



Order MYSIDACEA 



Suborder Lophogastrida 



Family LOPHOGASTRIDAE 



Genus Chalaraspidum W.-Suhm, 1895 (from MS. dated 1874) = Chalaraspis W.-Suhm, 187 5 = Eclytaspis Faxon, 

 1895. 

 Chalaraspidum alatum W.-Suhm (in MS. 1874) = Chalaraspis alata. 



Genus Gnathophausia W.-Suhm, 1873. 



Gnathophausia ingens (Dohrn), 1870 = 6'. inflata W.-Suhm, i873 = G. calcarata G. O. Sars, i885 = G. bengalensis 



Wood-Mason and Alcock, 1891= G. doryphora Illig, 1906. 

 Gnathophausia gigas W.-Suhm, 1873 = G. drepanephora Holt and Tattersall. 



Gnathophausia zoea W.-Suhm, 1873 = G. willemoesii G. O. Sars, 1885 = G. sarsi Wood-Mason and Alcock, 1891. 

 Gnathophausia gracilis W .-Suhm, 1875 = G. brevispinis Wood-Mason and Alcock, 1891 =G. dentata Faxon, 1893 = 



G. bidentata Illig, 1906. 



Genus Lophogaster M. Sars, 1857 = Ctenomysis Norman, 1862. 

 Lophogaster challenged Fage, 1942 = /,. typicus G. O. Sars, 1885. 

 Lophogaster spinosus Ortmann, 1906. 



Lophogaster rotundatus Illig, 1930 = /,. typicus var. Tattersall, 1911. 

 Lophogaster schmidti Fage, 1941. 



„ . „ „ Family EUCOPIIDAE 



Genus hucopia Dana, 1852. J 



Eucopia unguiculata (W.-Suhm), 1875 = 2?. australis (pars) G. O. Sars, 1885 = 2?. hanseni Nouvel, 1942. 



Eucopia grimaldii Nouvel, 1942. 



Eucopia australis Dana, 1852 = 2?. major Hansen, 19 10. 



Eucopia sculpticauda Faxon, 1893 = 2?. equatoria Spence-Bate, 1885 = 2?. intermedia Hansen, 19 10. 



Eucopia linguicauda sp.n. 



Suborder Mysida 



Family PETALOPHTHALMIDAE 



Genus Hansenomysis Stebbing, 1893= Arctomysis Hansen, 1887. 

 Hansenomysis antarctica Holt and Tattersall, 1906. 

 Hansenomysis falklandica sp . n . 



Genus Petalophthalmus W.-Suhm, 1875. 

 Petalophthalmus oculatus Illig, 1906. 



