SYSTEMATIC REPORT 101 



composed of seven segments and without any modified setae. All the male pleopods have long slender 

 sympods and very slender rami (Fig. 19 B). Uropods with the endopod small and tapering, extending 

 for nearly half its length beyond the short telson ; exopod broader and considerably longer than the 

 endopod (Fig. 19 C). Telson short, lateral margins concave, armed with 8-10 small spines, which are 

 confined to the distal two-thirds of the margin and form an evenly graduated row increasing in size 

 distally; apex broad and truncate with a very slight emargination in the median line; armed with three 

 pairs of long, slender spines, which become progressively longer towards the median line, and a pair 

 of plumose setae borne on a small papilla. The apex is so broad and the spines arming it are so slender 

 that they are unusually spaced — the space between the innermost pair being especially wide. 

 (Fig. 19 C). 



Length of adult male 9-25 mm., of adult female 9-4 mm. 



Fig. 19. Pseudomma magellanensis sp.n. A, anterior end of adult male in dorsal view; B, fourth pleopod of male; 



C, telson and left uropod in dorsal view. All x 20. 



Remarks. This species differs from P. sarsi in its smaller size; in its very deep eyeplate with the 

 two well-marked dorsal ridges and the shallow trough between them; in the fewer, coarser teeth 

 arming the lateral margins of the eyeplate; in the modified exopod of the fourth pleopod of the male 

 and, especially, in the small telson with its broad truncate apex and concave lateral margins. The telson 

 resembles that of P. truncation in some respects, but in truncatum there are only two pairs of long 

 spines arming the apex. 



Distribution. This species has been taken on only one occasion — by 'William Scoresby' in the 

 Strait of Magellan to the east of the northern end of Dawson Island, in a bottom tow-net during 

 daylight working at 300 m. and which failed to close. 



Pseudomma minutum sp.n. 



Occurrence: ( Fi §- 2oA -°) 



St. 51. 4. v. 26 (day). East Falkland Is., 105-1 15 m., 2 SS, 4"0~4'4 mm., 4 $?, largest 4-4 mm., ovigerous. <J Types. 



Second tube, 2 $$ adult with empty brood sacs, 4-2 mm. 

 St. WS 802. 5. i. 32 (day). North of Falkland Is., haul A, 132-139 m., fragments of ?. 

 St. WS 806. 7. i. 32 (day). North-west of Falkland Is., 130-123 m., 1 $, 4-4 mm., 2 adult $$, larger 4-6 mm. 



$ Types. 

 St. WS 818. 17. i. 32 (day). West-south-west of Falkland Is., 272-278 m., 1 g, 4 mm., 2 9$, larger 4-5 mm., 



ovigerous. 



Description. General form small and slender; anterior margin of carapace not produced and only 

 slightly convex. Antenmdar peduncle short, rather more robust in the male than in the female 



