86 DISCOVERY REPORTS 



short furrow spinelet on the angular margin of plate, followed by 5-7 longer subam- 

 bulacral spines in 3 longitudinal series of 2 each ; or 2 series with an odd spine behind 

 furrow spine, or on outer margin of plate. The plates are characteristically shorter than 

 broad and are distorted in adult specimens as indicated above. 



The rays of magnificus are more arched, the paxillae slightly larger, and the marginal 

 plates less numerous. In accrescens with R 1 10 mm. there are go inferomarginals, and in 

 magnificus with R 117 mm. there are 67. This difference is evident from Koehler's 

 figures. At interbrachial angle the width of the combined marginal plates is about the 

 same in the two species, but in magnificus the superomarginals are a little larger. The 

 slight disparity in size between the upper and lower marginal plates of Koehler's figure 

 is not constant ; in our specimen of magnificus there is a marked disparity. Both species 

 have an equally high narrow keel to the marginal plates, separating very deep marginal 

 fasciolar furrows. I am at a loss to understand Koehler's statement that they are 

 shallower in magnificus. He uses this as a differential character of Priamaster. The 

 gonads are distributed precisely alike in the two species. In the two comparable 

 specimens there is so little difference in the extent of the actinal intermediate areas that 

 it is rather futile to contrast them. In our specimens there are slightly more spinelets 

 on the actinal paxillae of accrescens. 



The abactinal plates are stellate, with 5 or 6 rather slender lobes, on the radial as well 

 as on lateral parts of the abactinal area. In mature specimens there is no median radial 

 area free from papulae. In young examples, however, this continuity is interrupted by 

 two adradial bands, free from papulae. There are thus on the rays two marginal and a 

 radial area of papulae. 



The colour in life is pale yellow with interradial bars of chocolate brown extending 

 nearly to centre of disk and a cross-bar of brown near end of ray (R no mm.). In the 

 very large specimen only the latter markings are present ; and in four small examples only 

 the interradial bars are present. The examples from Ross Sea lack the brown markings. 

 The largest specimen from St. 2467 was bright orange, tube feet dark orange. 



After the completion of this report, Dr N. A. Mackintosh sent photographs of a 

 large specimen and records of others. Three specimens from St. 2467 measure respec- 

 tively R 260, 260, 230 mm., r 85, 80, 80 mm., breadth of ray at base in all three 90 mm. 

 The specimen from St. 2563 measures R 230 mm., r 65 mm., br 80 mm. 



Type locality. Not indicated. Probably 65' 42' S, 92° 10' E, 60 fathoms. 



Distribution. The species is evidently circumpolar. It was taken by the Australasian 

 Antarctic Expedition between 64° 32' and 66° 50' S, and 92° 10' and 142° 6' E, 60- 

 354 fathoms. Probably at least some of Bell's specimens from Victoria Land are refer- 

 able to accrescens. Koehler has already reported it from South Georgia (1923, p. 98). 



