DESCRIPTION OF SPECIES 287 



St. WS 229: 50° 35' S, 57° 20' W, 210-271 m.; i 5 (b.), 5 immature. St. WS 233 : 49° 25' S, 59° 45' VV, 

 185-175 m.; 3 $? (b.), 2oc?, a number of immature. St. WS 234: 48° 52' S, 60° 25' W, 195-207 m.; 

 2 $$(b.), 6 immature. St. WS 235 : 47° 56' S, 61° 10' W, 155 m.; i <?, 3 $$ (b.), i immature. St.WS236: 

 46° 55' S, 6o°4o'W, 273-300 m.; i immature. St.WS237: 46° 00' S, 6o°05'W, 150-256 m.; ioV?(b.) 

 I $ (non-b.), i2<:JcJ, a number of immature. St. WS 239: 51° 10' S, 62° 10' W, 196-192 m.; 2$? (b.), i <S, 

 I immature. St. WS 243 : 51° 06' S, 64° 30' W, 144-141 m.; 11 immature. St. WS 244: 52° 00' S, 

 62° 40' W, 253-248 m.; 2 33, 3 immature. St. WS 245 : 52° 36' S, 63" 40' W, 304-290 m.; 3 immature. 

 St. WS752: 5i°2o'S, 63°i7'W, 160 m.; i young t?. St. WS754: 5i°09'3o"S, 58° 54' W, 106 m.; 



I immature. St. WS 758: 48° 32' S, 61" 19' W, 112 m.; a number of immature. St. WS 763 : 44° 14' S, 

 63° 28' W, 87-82 m.; I immature. St.WS765: 45°07'S, 60° 28' 15" W, ii3-ii8m.; 3$? (b.), 55 immature. 

 St. WS771: 42°4i'45"S, 6o°3i'W, 90 m.; y^S, 8 ?$ (b.), 10 ?? (non-b.), a number of immature. 

 St. WS 772: 47° 28' S, 6o°5i' W, 309-162 m.; 13 J, 7$ (b.), a number of immature. St.WS 774: 47° 08' S, 

 62°02'W, i39-i44m.; i ? (non-b.). St. WS 775: 46° 44' 45" S, 63° 33' W, 115-110 m.; 6 (?<?, 2 ?? (b.), 

 a few immature. St. WS776: 46° 18' 15" S, 65° 02' 15" W, 107-99 m.; i <J. St. WS 781 : 50° 30' S, 

 58°5o'W, 148 m.; 2(J(J, a number of immature. St. WS782: 50° 29' 15" S, 58° 23' 45" W, 141m.; 



II (J,^, 7?? (b.), 8?? (non-b.), a number of immature. St. WS 783: 50° 02' 45" S, 60° 14' W, 159-0 m.; 

 533, I? (b.), 2?? (non-b.), 7 immature. St. WS786: 49° 07' S, 63° 55' W, i33-ii9m.; 7 immature. 

 St. WS 787 : 48° 44' S, 65° 24' 30" W, 106-1 10 m. ; 5 <J(J, 2 ?? (non-b.), a number of immature. St. WS 791 : 

 45° 41' 45" S, 62°45'W, 96-101 m.; i? (b.), i? (non-b.), a number of immature. St. WS797: 

 47°45'36"S, 64° 20' W, 115-111 m.; 2?? (non-b.), a number of immature. St. WS802: Haul A, 

 50° 45' 45" S, 61° 22' W, 128-13201.; I, ^, 2$$ (b.), I ? (non-b.), several immature. St.WS 802: Haul B, 

 50° 43' 45" S, 6i°26'W, 132-139 m.; g<S3, 6S?(b.), 6?? (non-b.), several immature. St. WS 814: 

 5i°45'i5"S, 66°4o'W, iii-ii8m.; i immature. St. WS815: 51° 51' 45" S, 65° 44' W, i32-i62m.; 

 I immature. St. WS 816: 52° 09' 45" S, 64° 56' W, 150 m.; i cj, 7 immature. St. WS 818: 

 52° 31' I5"S, 63° 25' W, 272-278 m.; 7 immature. St.WS 824: 52° 29' 15" S, 58° 27' 15" W, 146-137 m.; 

 2immature. St WS 825: 50° 50' S, 57° 15' 15" W, 135-144 m.; id", 6?? (b.), several immature. St. WS866: 

 50° 37' 45" S, 64° 15' W, 137-144 m.; I immature specimen. 



Diagnostic characters. The largest male in the collection measures 28 mm. in 

 length and 33 mm. in greatest breadth, whilst a female in the breeding phase measures 

 23 mm. in length and 23 mm. in greatest breadth. The male (Plate XIV, fig. i) is thus 

 considerably broader in proportion to its length than the female, the latter being almost 

 circular in outline. 



The head is broadest at the eyes, which are large and prominent. Between them are 

 three somewhat triangular areas, the two lateral of which are raised to form low 

 prominences, while the central one forms the posterior boundary of the head. The body 

 is flattened; the coxal plates are sickle-shaped, with their outer halves projecting freely, 

 those of the first four free somites are marked off by sutures. In the male the coxal plates 

 of the seventh thoracic somite are long, extending, in the largest specimen, for the space 

 of about 5 mm. beyond the extremity of the terminal segment. The posterior margin 

 of the tergum of each thoracic somite, except the first, is curved backwards in the middle 

 line into a short spine; these diminish in size from before backwards. 



The pleural plates of the second abdominal segment are long and reach beyond the 

 end of the terminal segment in the male, but not quite to the end in the female ; those 

 of the third abdominal segment are short and do not extend far down the terminal 

 segment. The terminal segment is hexagonal in outline, its posterior end projecting as 

 a short spine. It bears a median dorsal and two lateral keels, the latter starting from the 

 base of a strong, stout spine, which lies in a median anterior position, and terminating 



5-2 



