i66 DISCOVERY REPORTS 



serial arrangement of the actinal and marginal plates, which gives the specimens a very 

 abnormal appearance. An analogous, sporadic, variation occurs in Henricia leviiiscula of 

 the Pacific coast of the United States. 



The largest specimen (St. WS 791) measures R 72 mm., r 16 mm., br 18-21 mm. 



A specimen from St. WS 81 carries a colour note: orange red dorsally and dull yellow 

 ventrally. 



Clark (1916, p. 60) has recorded as hyadesi 11 specimens from Tasmania, Bass 

 Strait, south of Gabo Island (Victoria), and Great Australian Bight, 50-200 fathoms. 

 Dr Clark has sent me a specimen from each locality except Bass Strait. While they 

 undoubtedly closely resemble the Magellanic species, an extensive series of obesa and 

 studeri throws a different light on the matter. The specimen from south of Gabo Island 

 seems to me to be a slender-rayed form of//, sufflata, Kermadec Islands. That from 78 

 fathoms, east of Maria Island, Tasmania, is possibly also a form oi sufflata (but definitely 

 not hyadesi) ; while that from the Great Australian Bight is of the compacta group, with 

 numerous adambulacral spines. 



Whether or not this interpretation is correct, it is , nevertheless , evident that in the waters 

 south of Australia there are forms closely similar to both studeri and obesa, just as in the 

 Auckland-Campbell Islands there is a form equivalent to pagenstecheri of South Georgia. 



Type locality. Challenger St. 315, Port William, Falkland Islands, 12 fathoms, 

 sand, gravel. 



Distribution. Typically a species of the Falkland Plateau and Magellan region; 

 north on the Pacific side of Iquique, Chile (Meissner) and on the Atlantic side to north- 

 east of Cape Tres Puntas, Argentina ; 24-242 m. in the Falkland region ; as deep as 245 

 fathoms off entrance to Smyth Channel (Challenger). It is possible that the record from 

 Iquique, Chile, may refer to another, nearly related form. //. australis Barattini (1938) 

 off Uruguay, closely resembles obesa and may be one of its numerous variants. 



Henricia pagenstecheri (Studer) 



(Plate XI, fig. 4) 



Cribrella pagenstecheri Studer, 1885, p. 158, pi. 2, figs. 6a, 6b. 

 Henricia pagenstecheri Koehler, pars, 1923, p. 60 (Shag Rocks). 



St. 6. Tristan da Cunha, 80-140 m., rock, i specimen. 



St. 25. 19 miles north-east of Jason Light, South Georgia, 18-27 m., 2 specimens. 



St. 39. East Cumberland Bay, South Georgia, 179-235 m., grey mud, i specimen. 



St. 123. Off mouth of Cumberland Bay, South Georgia, 230-250 m., grey mud, i specimen. 



St. 140. Stronmess Harbour to Larsen Point, South Georgia, 122-136 m., green mud and stones, 

 4 specimens. 



St. 141. East Cumberland Bay, South Georgia, 17-27 m., i specimen. 



St. 148. Off Cape Saunders, South Georgia, 132-148 m., grey mud and stones, i specimen. 



St. 149. Mouth of East Cumberland Bay, South Georgia, 200-234 m., mud, i specimen. 



St. 156. South Georgia, 53° 51' S, 36° 21' 30" W, 200-236 m., rock, i specimen. 



St. 160. Near Shag Rocks, 53° 43' 30" S, 40^ 57' W, 177 m., grey mud, stones, rock, 5 specimens. 



St. 474. I mile west of Shag Rocks, 199 m., i specimen. 



St. WS 27. South Georgia, 53° 55' S, 38° 01' W, 106-109 m., gravel, i specimen. 



