lyS DISCOVERY REPORTS 



There are good reasons for regarding this specimen as a different species to /. lineata 

 and not as the young of it. Although it is so much smaller, its gonads are mature. 

 P2 is the first genital pinnule, not Pg or P, as in lineata. The cirri are quite different, as 

 Carpenter's figures show. 



Carpenter describes the arms of both as smooth. This is more true of lineata than 

 angustipinna. In the latter the distal edges of all brachials beyond the first four or five 

 are raised and produced into spines ; in the former the distal edges of the brachials are 

 not everted and only those beyond the second syzygy have spines: the lower brachials 

 are quite smooth. 



Isometra vivipara Mortensen (Plate V, figs, i and 2) 



Isometra vivipara Mortensen, 1918, pp. 10-15, figs. 6-13, pi. i, figs. 6-10, pi. ii, figs. 5-7. 1920, 



pp. 31-48, pis. xiv-xxiii. Clark, 1923, p. 42. 

 Antedon hirsuta Andersson, 1904, pp. 1-7, Taf. i-ii. 



St. 175. 2. iii. 27. Bransfield Strait, South Shetlands. 63° 17' 20" S, 59° 48' 15" W. 200 m. 

 Gear DLH. Bottom: mud, stones and gravel. One female. 



St. 652. 14. iii. 31. Burdwood Bank. 54° 04' S, 61° 40' W. 171-169 m. Gear OTL. Fifteen 

 males and three females; pentacrinoid young. 



St. WS 81. 19. iii. 27. 8 miles N 11° W of North Island, West Falkland Island; from 51° 30' S, 

 61° 15' W to 51° 30' 30" S, 61° 10' W. 81-82 m. Gear OTC. Bottom: sand. One male and two 

 young. 



St. WS 83. 24. iii. 27. 14 miles S 64° W of George Island, East Falkland Island; from 52° 28' S, 

 60° 06' W to 52° 30' S, 60° 09' 30" W. 137-129 m. Gear N 7-T. Bottom: fine green sand and 

 shells. Twelve large specimens with most or all of the arms broken ofi^; four recognizable as males 

 and six as females. 



St. WS 85. 25. iii. 27. 8 miles S 66° E of Lively Island, East Falkland Island; from 52° 09' S, 

 58° 14' W to 52° 08' S, 58° 09' W. 79 m. Gear OTC. Bottom: sand and shell. The centro-dorsals, 

 calices, and arm-bases of two specimens, and fragments of arms, both male and female. 



St. WS 212. 30. V. 28. 49° 22' S, 60° 10' W. 242-249 m. Gear N 7-T. Bottom: green sand, 

 mud and pebbles. One immature specimen. 



St. WS 228. 30. vi. 28. 50° 50' S, 56° 58' W. 229-236 m. Gear OTC. Bottom: coarse white 

 sand. One female. 



St. WS248. 20. vii. 28. 52° 40' S, 58° 30' W. 210-242 m. Gear OTC. Bottom: fine green sand, 

 pebbles and shells. One male and three females. 



St. WS 824. 19. i. 32. 52° 29' 15" S, 58° 27' 15" W. 146-137 m. Gear OTC. Bottom: green 

 speckled sand, and shells. Two incomplete specimens, one a female. 



St. WS 877. 4. iv. 32. 52° 35' 30" S, 6i°04'W. 35o(-o)m. Gear NR. Bottom: no data. 

 Seven males and four females; pentacrinoid young. 



All but one of these 55 specimens come from nine stations near the Falkland Islands 

 or on the Burdwood Bank, from depths of between 79 and 350 m. These are a few of 

 very many trawling stations made on the Burdwood Bank, around the Falkland Islands, 

 between them and Tierra del Fuego and the American mainland, and on the Patagonian 

 shelf to the north. Some are shown in Discovery Reports, Vol. i. Station List, pi. iv 

 and Vol. in. Station List, pi. iii. A later trawling survey of the area has been made, 

 but the Station List including it has not been published. It consists of a larger number 



