5 8 DISCOVERY REPORTS 



the circumstances I have removed some of the appendages in order to make accurate drawings of 

 them. 



Distribution. Open ocean to the west of Saldanha Bay, South Africa, captured in a closing net 

 fishing between 1600 m. and 1000 m. 



Eucopia sp. 



Occurrence: v &• 7 / 



St. 295. 26. viii. 27 (day). West of Sierra Leone, 270o-250o(-o) m., 1 damaged imm. specimen, estimated length 

 12 mm. 



Remarks. This specimen is too damaged to be described fully. The anterior end of the carapace 

 and the eyes are distorted so that their normal form cannot 

 be ascertained. The antennule is somewhat slender, articulation 

 between second and third segments not oblique ; inner margin 

 of third segment slightly longer than the distal margin with 

 only a very small setiferous lobe at the distal end. The antennal 

 scale is less broad than is usual in other species of the genus ; 

 the spine marking the distal end of the unarmed portion 

 of the outer margin is extremely small, but quite clearly 

 developed; distal articulation very oblique; apex bluntly 

 pointed and markedly asymmetrical (Fig. 7 A). Endopods of 

 the second to the fourth thoracic appendages long and slender 

 with the dactylus and nail relatively very long (Fig. 7B). 

 Uropods with the exopods shorter than the endopods and 



the terminal segment half as long again as broad at its proximal end. Telson slightly longer than the 

 uropods; apex bluntly and evenly rounded. (Fig. 7C). 



Suborder Mysida 



Family PETALOPHTHALMIDAE Czerniavsky 



This family is characterized by the absence of gills on the thoracic appendages; the presence of seven 

 pairs of oostegites in the female; the undivided propodus of the thoracic endopods; the biramous 

 pleopods of the male (with the endopod of the fifth pair modified in the genus Hansenomysis) and the 

 reduced pleopods of the female ; the absence of a statocyst on the endopod of the uropod ; the two- 

 segmented exopod of the uropod and (with the one exception of Petalophthalmns oculata Illig), by the 

 rudimentary eyes, lacking all traces of visual elements and reduced either to flat plates or to more or 

 less spiniform processes. 



I should like to take this opportunity of correcting a typographical error which occurs on p. 114 

 of the recently published monograph on British Mysidacea (Tattersall and Tattersall, 1951). The 

 sentence beginning ' A second species . . . ' should read ' Only one species of the family Petalophthal- 

 midae, Petalophthalmus oculata Illig (1906, p. 194), has the eyes. . . '. 



Fig. 7. Eucopia sp. A, right antenna ; B, distal 

 end of endopod of fourth thoracic appendage; 

 C, telson and right uropod in dorsal view. 



Genus Hansenomysis Stebbing, 1893 

 1887 Arctomysis Hansen, p. 210. 

 1893 Hansenomysis Stebbing, p. 268. 



Remarks. Only two species are at present included in this genus, H. fyllae Hansen and H. antarc- 

 tica Holt and Tattersall. I am now able to add a third species H. falklandica, which agrees with the 

 other two species in the rudimentary form of the eyes. It would appear that this character can be 



