278 



DISCOVERY REPORTS 



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

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

 St. 180. II. iii. 27. SchoUaert Channel, Palmer Archipelago, 160 m. 15 specimens. 

 St. 181. 12. iii. 27. SchoUaert Channel, Palmer Archipelago, 160-335 ■^- Several specimens. 

 St. 182. 14. iii. 27. SchoUaert Channel, Palmer Archipelago, 278-500 m. Several specimens, 

 partly very young. 



St. 186. 16. iii. 27. Fournier Bay, Anvers Island, Palmer Archipelago, 295 m. 3 specimens. 



St. 187. 18. iii. 27. Neumayr Channel, Palmer Archipelago, 259-354 "i- ^ specimen. 



St. 190. 24. iii. 27. Bismarck Strait, Palmer Archipelago, 315 m. i specimen. 



St. 195. 30. iii. 27. Admiralty Bay, King George Island, Palmer Archipelago, 391 m. 4 specimens. 



These specimens are, on the whole, in full agreement with the excellent description 

 and figures given by Koehler {op. at.). It may be pointed out that there are sometimes 

 only five spines at the base of the arms, instead of the usual six or seven. A very note- 

 worthy fact is that some of the spines on the part of the arms enclosed within the disk 

 not infrequently terminate in two diverging, hyaline hooks (Fig. ij o), instead of the 



Fig. 16. Ampliiura Joitbini, Koehler, young. Part of oral side {a) and dorsal side {b). 18. 



usual single, inwardly pointing hook. This hook is not confined to the part of the arm 

 enclosed within the disk, as Koehler states, but may continue almost to the middle of 

 the arm, only it is much less conspicuous farther out on the arm, and is turned outwards. 

 The spines are on the whole very smooth. 



Young specimens have a very characteristic appearance, due to the fact that the edge 

 of the disk-scales is somewhat thickened and very finely thorny, one might say ciliated 

 (Fig. 16 ^); also the primary plates are distinct, though small, whereas they are indis- 

 cernible in the adult. As these young specimens also have the main part of the ventral 

 interradii naked and have generally only one tentacle scale, or even none at all, and only 

 four spines, without distinct hooks, they differ so strikingly from the adult that one 

 would be inclined to regard them as a separate species. There are, however, all possible 

 transitions, according to size, from the young to the adult specimens, so that it is per- 



