SYSTEMATIC REPORT 115 



St. 1991. 11. iii. 37 (day). West of South Sandwich Is., 1500-1000 m., 3 $$, 1 9, 1 juv. 



St. 1993. 12. iii. 37 (day). South of South Sandwich Is., 950-650 m., 1 <3\ 2 ?$, fragments. 



St. 1999. 15. iii. 37 (day). Ice Edge, south of South Sandwich Is., 1000-500 m., 1 adult <J. 



St. 2006. 19. iii. 37 (day). Ice Edge, south-east of South Sandwich Is., 1750-1400 m., 1 adult $. 



St. 2018. 26. iii. 37 (night). West of Bouvet I., 1000-750 m., 1 <J, 2 $?, all adult. 



St. WS 22. 30. xi. 26 (day). Off South Georgia, 1000-750 m., 1 juv. 



St. WS 30. 19/20. xii. 26 (night). Off South Georgia, 750-500 m., 1 small juv., 6-5 mm. 



St. WS 38. 22. xii. 26 (night). East of South Georgia, 1000-750 m., 3 juv., 7 mm. 



St. WS 44. 8. i. 27 (day). South Georgia, 750-500 m., 1 small juv. 



St. WS 144. 19. i. 28 (day). Off South Georgia, 270-100 m., 1 juv. 



St. WS 385. 16. ii. 29 (night). Bransfield Strait, South Shetland Is., 1000-750 m., 1 adult $, 18 mm. 



St. WS 976. 6. iii. 50 (day). 200 miles west of Walvis Bay, 1000-750 m., 1 juv. <J, 6 mm. (Bad condition.) 



Remarks. This species may be recognized by its small pear-shaped eyes with the well-developed 

 finger-like process from the inner distal margin of the eyestalk, by the comparatively long antennular 

 peduncles which are only slightly shorter than the antennal scale, by the bluntly rounded rostrum 

 with its convex lateral margins and by the linguiform telson armed around its distal half with a 

 regularly graduated row of spines with the largest at the apex. The only other species of the genus at 

 present known from Antarctic waters is D. antarctica Hansen, 1913. This species has large, short, 

 very broad, obliquely set eyes, which are quite far apart, with a broadly rounded rostrum between 

 them and a small antennal scale which has no tooth at the distal end of the naked outer margin. 



Distribution. The Discovery collections prove that this species has a circumpolar distribution 

 south of 50 S. The type was dredged at about 3700 m. in the Ross Sea. Zimmer (1914) recorded it 

 from several stations south-west of Heard Island in the South Indian Ocean and Illig (1930) from 

 seven stations around Bouvet Island in the South Atlantic. 



It was taken at forty-two stations by 'Discovery' and 'Discovery II' and at seven by 'William 

 Scoresby' (sometimes in more than one haul at a station), mostly around South Georgia and the 

 South Sandwich Group ranging from the South Orkneys and South Shetlands to the Ross Sea and 

 along the Ice Edge of the South Pacific and Indian Oceans. 



It most commonly occurs between depths of 1000-500 m. but has been taken at over 3500 m. On 

 one occasion only has it been captured at less than 500 m., at station WS 144. The species has always 

 occurred in small numbers, usually only one or two specimens appearing in a haul. 



^.,, w L T11 . Genus Gibberythrops Illig, 1930 



1930 Gibberythrops Illig, p. 431. ° yj 



Remarks. Only one of the previously described species of the genus, G. acantkura, is represented 

 in the present material, but in a haul taken by ' Discovery II ' to the west of Cape Town, there is 

 a single immature male specimen which closely resembles G. philippinensis, differing only in the much 

 less convex anterior margin of the carapace, which is produced forward to form a broad rostral plate ; 

 in the very large peculiar eyes ; in the form of the antennal scale and in details in the armature of the 

 uropods and telson. This specimen is in very bad condition and the endopods of the third to the 

 eighth thoracic appendages are missing. The pleopods are small and very immature. It would, never- 

 theless, seem to represent a new species which I refer, somewhat doubtfully, to the genus Gibberythrops. 



Gibberythrops acanthura (Illig), 1906 



1906a Parerythrops acanthura Illig, p. 197, figs. 



1930 Gibberythrops acanthura (Illig), p. 431, figs. 



1936 Erythrops (Gibberythrops) acanthura Coifmann, p. 32, figs. 



1951 Gibberythrops acanthura, W. M. Tattersall, p. 122, figs. 



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