Indian Deep-sea Asteroidea. 89 



in tlie interradial areas, flexible ; rays very short and broad, 

 flat, pointed, rigid, upturned at the tip. 



Abactinal surface covered with uniformly small round 

 tabular plates, which are distinctly isolated from one another 

 and are fringed with a single row of flat squamous membrane- 

 clad granules flush with the general surface, but are otherwise 

 naked, except that some of the plates (perhaps one fourth) 

 bear a very excentric or quite marginal broadly bilobed |)edi- 

 cellaria. Papulte long, crowded everywhere, except in a 

 narrow band down the middle of each interradial area, where 

 the plates are in close apposition. 



Marginal plates 17 in each series from mid-interbrachiura 

 to ti]) of ray, quadrangular, fringed with squamous granules 

 like the abactinal plates, and occasionally bearing a deciduous 

 bilobed pedicellaria ; the supero-marginals with a small 

 central patch of deciduous granules, the infero-marginals with 

 a much larger similar patch ; at the very tip of the rays these 

 patches of granules are placed on distinct elevations. 



Adambulacral plates with a furrow-series of 6 or 7 coarse 

 prism-shaped spinelets, and actinally with (i.) a longitudinal 

 series of three or four large coarse distant granules, one or two 

 of which in a series are often replaced by a bivalve pedi- 

 cellaria ; and (ii.) numerous distant conical granules, arranged 

 in two irregular rows, but sometimes only in one. Mouth- 

 plates large, with the furrow spinelets chisel-shaped, the most 

 central (adoral) one being enlarged. 



Actinal interradial areas very large, continued to the tip 

 of the ray; the intermediate plates are rather closely covered 

 with small rounded granules which are more or less decidu- 

 ous; many of those nearest the actinostome carry one or two 

 rather broadly bilobed pedicellaricC. 



Anus excentric. Madreporiform plate of moderate size, 

 placed a third of the way from the centre to the margin, with 

 line radial striatious. 



Colour in life brilliant orange. 



Bay of Bengal, ofi:' the Kistna Delta, 678 fathoms, brown 

 mud. 



22. Pentagonaster arcuatuSj Sladen. 



Pentayomisler arcuatus, Sladen, ' Challenger ' Asteroidea, p. 277, pi. lii. 

 figs. 1 and 2, pi. xviii. figs. 5 and 6. 



1 am not quite certain about this determination, although 

 our species coniorms exactly to Mr. Sladen's description, and 

 although the habitat supports it — the ' Challenger ' sjjecimen 

 being dredged in the green mud of the Japanese Sea at 



Ann. dj MiKj. N. Hist. ►Ser. G. Vul. xi. 7 



