2i8 DISCOVERY REPORTS 



St. WS99. 19. iv. 27. 49° 42' S, 59° 14' W, 251-225 m. 2 specimens. 



St. WS 109. 26. iv. 27. 50° 18' S, 58° 28' W, 145 m. 3 specimens. 



St. WS 211. 29. V. 28. 50° 17' S, 60° 06' W, 161-174 m. 2 specimens. 



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



St. WS 246. 19. vii. 28. 52° 25' S, 61° 00' W, 267-208 m. i specimen. 



St. WS 248. 20. vii. 28. 52° 40' S, 58° 30' W, 210-242 m. 12 specimens. 



St. WS 795. 18. xii. 31. 46° 14' S, 60° 24' W, 157-161 m. i specimen. 



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



St. MS 71. 9. iii. 26. East Cumberland Bay, South Georgia, 1 10-160 m. i specimen. 



The specimens from St. 39 might almost equally well be identified as S. antarcticiis 

 (cf. below). 



The specimen from St. WS 91 measures no less than 81 mm. h.d., and thus by far 

 exceeds the largest size hitherto recorded for this species, viz. 60 mm. It is of the typical 

 shape, low-conical (Plate II, figs. 14-16) ; even at this large size the oculars are all exsert. 

 As might be expected, the secondary tubercles of the oral side are particularly well 

 developed ; but the fact that the areoles of the consecutive plates are widely separated is 

 unusual, they being otherwise as a rule confluent. On the other hand, the areoles of the 

 primary and the larger secondary tubercles of the same plates may be confluent near 

 the ambitus. That this is merely an individual peculiarity, not indicating a local type, 

 appears from the fact that other specimens from the same region (e.g. St. WS 109) 

 have the areoles confluent. 



Plate II, figs. 12, 13 give a good representation of the characteristic appearance of this 

 species when preserved with its dense, bristling coat of delicate secondary spines 

 intact. Unfortunately these spines, as well as the primary ones, are exceedingly brittle 

 so that the merest touch will break them. 



Sterechinus antarcticus, Koehler 



Sterechinus antarcticus, Koehler, 1902. Result. Voyage 'Belgica'. Echinides et Ophiures, 



p. 8, pis. ii, figs. 9-10; iii, figs. 1-8, viii, figs. 55-56. 

 S. antarcticus, Mortensen, 1909. Deutsche Siidpolar-Exped. Echinoiden, p. 75, Taf. viii, 



figs. 2, 4, 14-15; ix, figs. I, 3-5, 14; xvii, figs. I, 7, 10, 16, 19-21, 26, 30. 



St. 170. 23. ii. 27. Clarence Island, 342 m. 4 specimens. 



St. 175. 2. iii. 27. Bransfield Strait, South Shetlands, 200 m. i specimen (young). 

 St. 177. 5. iii. 27. 27 miles SW of Deception Island, South Shetlands, 1080 m. i specimen 

 (fragments). 



St. 180. II. iii. 27. Schollaert Channel, Palmer Archipelago, 160-330 m. 2 specimens. 

 St. 181. 12. iii. 27. Schollaert Channel, Palmer Archipelago, 160-335 m. 3 specimens. 

 St. 182. 14. iii. 27. Schollaert Channel, Palmer Archipelago, 278-500 m. i specimen. 

 St. 599. 17. i. 31. 67° 08' S, 69° 06' W, 203 m. I specimen (young). 

 St. WS 167. I. iii. 28. 53° 31' S, 39° 22' W, 460 m. i specimen. 



The distinction between S. antarcticus and S. Agassisii is not sharp ; as a matter of 

 fact the specimens from St. 181 may perhaps rather be referable to S. Agassisii, while, 

 on the other hand, the specimens from St. 39 mentioned above under S. Agassizii might 

 equally well be referred to S. antarcticus. The consequence is that S. antarcticus can 

 hardly be maintained as a separate species, but only as a variety, and not even a very 



