2S0 DISCOVERY REPORTS 



5. i. 27. Off mouth of Stromness Harbour, South Georgia, 155-178 m. 4 specimens. 

 148. 9. i. 27. Off Cape Saunders, South Georgia, 132-148 m. i specimen. 

 17. i. 27. 53° 51' S, 36° 18' W, South Georgia, 245 m. i specimen. 



20. i. 27. 53° 51' S, 36° 21' W, South Georgia, 200-236 m. 7 specimens. 



21. i. 27. 53° 52' S, 36° 08' W, South Georgia, 160 m. 2 specimens. 

 7. ii. 27. Near Shag Rocks, South Georgia, 177 m. 3 specimens. 

 20. ii. 27. Off Signy Island, South Orkneys, 244-344 "i- 4 specimens. 



23. ii. 27. Off Cape Bowles, Clarence Island, 342 m. 7 specimens. 

 2. iii. 27. Bransfield Strait, South Shetlands, 200 m. i specimen. 



24. iii. 27. Bismarck Strait, Palmer Archipelago, 93-130 m. i specimen. 



St. 363. 26. ii. 30. 2-5 miles S 80° E of Zavodovski Island, South Sandwich Islands, 329-278 m. 

 I specimen. 



St. WS 27. 19! xii. 26. 53° 55' S, 38° 01' W, South Georgia, 107 m. 5 specimens. 



St. WS 33. 21. xii. 26. 54° 59' S, 35° 24' W, South Georgia, 130 m. Several specimens. 



St. WS 42. 7. i. 27. 54° 42' S, 36° 47' W, South Georgia, 198 m. 2 specimens. 



St. WS 228. 30. vi. 28. 50° 50' S, 56° 58' W, Falkland Islands, 229-236 m. i specimen. 



St. WS 244. 18. vii. 28. 52° 00' S, 62° 40' W, Falkland Islands, 253-247 m. 2 specimens. 



St. WS 840. 6. ii. 32. 53° 52' S, 61° 49' W, 368-463 m. 3 specimens. 



St. MS 14. 17. ii. 25. East Cumberland Bay, South Georgia, 190-110 m. 2 specimens. 



St. MS 71. 9. iii. 26. East Cumberland Bay, South Georgia, 110-60 m. Several specimens. 



It seems quite certain that Koehler's A. Mortenseni is identical with his A. Belgicae. 

 In describing the former {op. cit., 1908, pp. 604-5) ^^ evidently forgot A. Belgicae, 

 since he does not say a word of how they are to be distinguished from one another, only 

 mentioning that A. Mortenseni cannot be confounded with A. Engeniae and A. Studeri. 

 In the descriptions of the two species no distinguishing characters are to be found, but 

 the figures would seem to show them to be different. Thus the tentacle scales of A. 

 Mortenseni are shown (pi. xiv, fig. 122) in a very curious position, at a right angle to one 

 another; but that this is erroneous has been pointed out by Koehler himself {op. cit., 

 1922, p. 31). As shown by the photographic figures given there, the tentacle scales are 

 as in y^. Belgicae. Some slight difference may be found in the shape of the buccal shields ; 

 but as shown in pi. 80, figs. 6-8 of Koehler's work of 1922, there is a considerable 

 variation in their shape, so that no reliable distinguishing character can be deduced from 

 them. There are no other differences. Comparison of a couple of co-types of ^. Belgicae, 

 received from the Brussels Museum, with the published figures of A. Mortenseni shows 

 beyond any doubt that they are identical. 



In addition the subspecies gracilis of A. Engeniae, established by Hertz (Deutsche 

 Siidpolar-Exped., Ophiuroiden, p. 30), is in my opinion simply a synonym oi A. Belgicae. 

 Through the kindness of Professor W. Arndt, of the Berlin Museum, I have had a couple 

 of specimens for examination and find them to agree completely with A. Belgicae. As 

 for the character that it has only three arm spines, I find that an arm of a larger specimen 

 lying together with these specimens has actually four spines, so this difference is not 

 reliable. 



Further, there can in my opinion be no doubt but that Koehler's A. alternans is also 

 identical with A. Belgicae. Koehler {op. cit., 1923) points out the great variation in the 

 tentacle scales o{ A. alteriians — from one scale almost regularly throughout the arm, to 



