PHOTIDAE 229 



above the level of the middle line, each with a spine and a setule, distal margins concave, 

 sloping to the sharply acute apex. 



Antenna 1, 3rd joint longer than 1st, flagellum about 18-jointed, accessory flagellum 

 6-jointed. Antenna 2 subequal to antenna 1, flagellum 12-16-jointed. Epistome with a 

 strong spiniform projection. Third joint of mandibular palp large, oval, laminate, 

 longer and broader than 2nd joint. 



Gnathopod 1, 6th joint slightly shorter than 5th, both broadly expanded (cf. pur- 

 purescens, but 6th not so strongly expanded). Gnathopod 2, stout, especially in <J, 2nd 

 joint strongly channelled in front, both keels ending distally in projecting lobes, 

 especially the inner one, the outer one in S irregularly serrate, in $ very obscurely 

 serrulate, 5th joint short, triangular, cup-shaped, 5th and 6th very heavy in <$, broad 

 dorsally (anteriorly) with the surface distinctly flattened, the inner and outer margins 

 forming low ridges, the inner with groups of spinules, the outer smooth, 6th joint 

 broad, widening distally to the somewhat oblique palm which is subequal to the hind 

 margin, defined by a strong tooth with two triangular teeth separated by a notch, the 

 tooth nearer the hinge being the larger, finger closing on to inner surface ; in ? 5th and 

 6th joints rounded not flattened on dorsal margin, palm oblique, minutely crenulate, 

 with one small tooth about in middle, and another, with a stout spine, forming a de- 

 fining angle, below which the margin curves downwards before passing into hind 

 margin. 



Peraeopods 3-5, 2nd joint elongate oblong (cf. purpurescens), hind margin serrulate, 

 lower hind angle rounded in peraeopod 3, quadrate in peraeopods 4 and 5. 



Uropod 3, upper outer margin of peduncle spinose, three stout spines on distal 

 margin at bases of rami. 



Colour (as preserved), pale yellowish-white, eyes brownish. In the ?? and in the 3 

 from St. 123 there are indications of a series of brownish spots laterally at the junctions 

 of each pair of peraeon and pleon segments. 



Remarks. At first sight somewhat resembling distichon, which is also uniformly pale- 

 coloured ; but easily distinguished by the telson and other features. The flattened upper 

 surface of the 5th and 6th joints of gnathopod 2 is noteworthy. 



Although the two sexes were not found together, the complete agreement, except in 

 the secondary sexual characters, makes it certain that they are conspecific. Moreover, 

 nos. 1 and 2 are both from the South Georgia area. 



Eurystheus remipes, n.sp. (Fig. 143). 



Chilton, 1912, p. 510, pi. ii, figs. 30-34 (afer, von Stebb.); 1920, p. 7 (dentatits, non Chevr.). 



Occurrence: St. 51. Falklands. 1 $ 6 mm. 



Description of <$. Eyes broadly oval, oblique. Ocular angle of head rounded, 

 post-antennal angle acute but not prominent. Peraeon and pleon dorsally smooth. 

 Side-plate 1 oblong, not produced forwards, setulose but not dentate, 2 much larger. 

 Postero-inferior angle of pleon segment 3 rounded, with a small subapical notch on 

 lower margin. Telson transverse, apex rounded, a strong spine on each lateral angle. 



