2s6 DISCOVERY REPORTS 



Ophiomitrella ingrata, Koehler 



Ophiomitrella ingrata, Koehler, 1908. Scott. Nat. Antarct. Exped. Asteries, Ophiures et 

 Echinides, p. 613, pi. xiv, figs. 126-127. 



St. 399. 18. V. 30. Off Gough Island, 102-141 m. Several specimens. 



Ophiomitrella falklandica, n.sp. 



(Plate VII, fig. 5) 



Ophion'pa ingrata, Koehler, 1923. Swedish Antarct. Exped. Asteries et Ophiures, p. 106, 

 pi. xiv, figs. 4-6. 



St. 175. 2. iii. 27. Bransfield Strait, South Shetlands, 200 m. 2 specimens. 

 St. 652. 14. iii. 31. Burdwood Bank, 169-171 m. 5 specimens. 



St. WS 83. 24. iii. 27. 14 miles S 64° W of George Island, East Falkland Islands, 137-129 m. 

 I specimen. 



St. WS85. 25. iii. 27. 8 miles S 66° E of Lively Island, East Falkland Islands, 79 m. 3 specimens. 



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



St. WS 246. 19. vii. 28. 52° 25' S, 61° 00' W, Falkland Islands, 267-208 m. 3 specimens. 



St. WS 248. 20. vii. 28. 52° 40' S, 58° 30' W, Falkland Islands, 210-242 m. 5 specimens. 



St. WS 773. 31. X. 31. 47° 28' S, 60° 51' W, 291-296 m. 4 specimens. 



St. WS 804. 6. i. 32. 50° 21' S, 62° 53' W, Falkland Islands, 143-150 m. i specimen. 



St. WS 824. 19. i. 32. 52° 29' S, 58° 27' W, Falkland Islands, 146-137 m. 4 specimens. 



St. WS 825. 29. i. 32. 50° 50' S, 57° 15' W, Falkland Islands, 135-144 m. 4 specimens. 



St. WS 829. 31. i. 32. 50" 51' S, 63° 13' W, Falkland Islands, 155 m. 4 specimens. 



St. WS 840. 6. ii. 32. 53° 52' S, 61° 49' W, Falkland Islands, 368-463 m. 5 specimens. 



St. WS 871. I. iv. 32. 53° 16' S, 64° 12' W, Falkland Islands, 336-341 m. i specimen. 



The specimens from off the Falkland Islands and from the Burdwood Bank are 

 regarded by Koehler {op. cit.) as identical with the species from Gough Island, originally 

 described by Koehler as Ophiomitrella ingrata, but in his work on the Asterids and 

 Ophiurids of the Swedish Antarctic Expedition [loc. cit.) transferred to the genus Ophio- 

 ripa ; but in my opinion they decidedly represent a different species. As appears from 

 the figures given here of the two species (Figs. 8 a-d), the species from the Falkland 

 region differs from O. ingrata, in addition to its much larger size (up to 9 mm. diameter 

 of disk, O. ingrata not surpassing a diameter of 5 mm.), in being in general much coarser. 

 This is seen clearly even in young specimens, as shown in the figures which are drawn 

 from specimens of 3-5 mm. diameter of both species ; in the larger specimens this differ- 

 ence is much more conspicuous. It is in the arm spines, the grains of the disk, and the 

 mouth papillae that this difference is to be found, as seen from the figures ; in both, how- 

 ever, they are finely thorny and rough. In the ventral and dorsal arm plates there is no 

 distinct difference, but the radial shields afford a good and apparently constant difference, 

 being widely separated m falklandica and contiguous in ingrata. The difference in the 

 shape of the buccal shields shown in the figures is less reliable. It may be added that 

 the granules of the disk in falklandica are often more elongate and quite club-shaped, 

 recalling, indeed, the condition found in Ophioripa conferta, Koehler. As a matter of 

 fact O. falklandica very much recalls Ophioripa conferta from off Maria Island, Tas- 



