228 DISCOVERY REPORTS 



Other they are as numerous as in a young example of armata (R 17 mm.) where some 

 of the proximal plates and all of the distal half of ray are monacanthid. 



The macrocephalous pedicellariae are closely similar to those figured by Koehler 

 (1920) but are more numerous in the large specimen where the carinal plates carry a 

 battery of from 2 to 5 and disk spines, 5-8, attached to the swollen base of the spine 

 sheath. A short series of dorsolateral spines carries i or 2 of these major pedicellariae. 

 The superomarginal spines have a complete wreath of ordinary pedicellariae extending 

 half the height of spine, and in addition the proximal spines carry i or 2 major pedicel- 

 lariae. The inferomarginals each have a thick pad of numerous minor pedicellariae on 

 the outer side, while actinals are similarly armed with about 10 minor pedicellariae. The 

 inferomarginal spines are all united at the base by a web of skin which would obviously 

 be broader if the pads of pedicellariae were advanced to the end of spines. The promi- 

 nence of this ventrolateral web (which is present in N. armata) depends upon the 

 contraction of sheath muscles. A similar web occurs in typical Coscinasteriinae. 



There is no trace of actinal papulae. 



The young specimens (R 17 and 20 mm.) already have the minor crossed pedicellariae 

 developed on supero- and inferomarginal spines, whereas in the much larger armata and 

 stolophora they are absent. These small specimens also carry i or 2 macrocephalous 

 pedicellariae at base of the central, primary radial, and about half of the carinal spines. 

 Some of them belong to the pirocephalous variety of Koehler and appear to be incom- 

 pletely developed macrocephalous, lacking the long hyaline spine at end of jaw. 



I do not believe a generic distinction, based upon number of adambulacral spines, can 

 be drawn between A'', armata and N. bongraini. 



Distribution. South Shetland Islands, 420-830 m., latitude 65° 42' to 66° 55' S, 

 longitude 92^ 10' to 145° 21' E, 60-318 fathoms. 



Notasterias species 



St. 195. Admiralty Bay, King George Island, South Shetlands, 391 m., 3 specimens. 

 St. 599. West coast of Adelaide Island, 67° 08' S, 69° oGV W, 203 m., i specimen. 



The specimen from St. 599 has R 18 mm. and definitely diplacanthid adambulacrals. 

 There are no specialized major pedicellariae. The carinal, some of the few dorsolateral, 

 the superomarginal, and inferomarginal spines carry i or sometimes 2 normal crossed 

 pedicellariae, circa 0-4 mm. long, resembling those of A^. bongraini (Fig. 3«) but with a 

 straighter terminal lip as seen in profile. Along the furrow margin at base of about every 

 third or fourth spine is a broadly lanceolate straight pedicellaria. 



The largest specimen from St. 195, representing probably a second species, has R 

 15 mm. and monacanthid adambulacrals. It has a few normal straight pedicellariae but 

 no major pedicellariae. The other specimens (R 8 and 5 mm.) have still fewer crossed 

 pedicellariae. The largest specimen has only a few furrow straight pedicellariae, the 



others none. 



The important feature of these specimens is the absence of the specialized major 



