100 Mr. A. Alcockon 



of the plates of the apical half of the ray tliey are unarmed, 

 but the cap- like terminal plate has a fringe of five spinelets. 

 The infero-marginals, which correspond plate to plate with 

 the supero-marginals, have each a strong lateral bulge on 

 which stands a horizontal series of three (sometimes only 

 two) spines, but in the apical half of the rays there is only one 

 spine, ])laced on the extreme distal edge of the plate. 



The small adambulacral plates have each a palmate furrow- 

 series of six or seven spinelets, and almost in serial continuity 

 with these, and to the central (adoral) side of them, a pedi- 

 cellaria with two long spoon-shaped valves; actinally each 

 plate has near its distal end an eminence on which stands a 

 stout spine longer than the plate itself and usually longei* 

 thaii any of the infero-marginal spines, in addition to two or 

 three pustules; on the mouth-plates, which are extremely 

 prominent actinally, the spine and pedicellaria are usually 

 absent, and only the pustular granules present, but the central 

 (adoral) furrow-spines are much enlarged. 



The actinal interradial areas are very large, reacliing to the 

 sixth or seventh infero-marginal (thirteenth or fourteenth 

 adambulacral) plates ; each area bears eighty to ninety large 

 plates arranged inconcentricchevrons; all the plates are covered 

 with a distantly granular membrane, and some or all of them 

 (but most constantly those of the series next the ambulacrum) 

 bear one or more papilliform pedicellarige ; the plates of the 

 second series from the ambulacrum are of superior size. 



Anus central, distinct. Madreporiform plate large, with 

 fine radial striations ; placed rather nearer to the centre than 

 to the margin. 



Ambulacra! furrow wide ; tube-feet with a terminal sucker. 



Andaman Sea, 130 to 250 fathoms. 



Family Asterinidse. 



Palmipes, Linck. 



35. Palmipes pellucidus J sp. n. 



Rays 5. R = 1'5 r. R = 48 millim. in the 

 type specimen. 



Form a curvilinear pentagon with bluntly rounded angles; 

 flat, very thin and leaf-like, membranous, semitransparent. 



Abactinal surface with regular longitudinal and oblique 

 rows of scale-like rhomboid or subhexagonal plates, which 

 gradually diminish in size from the centre to the margin ; all 

 the plates are covered with distant erect spicules and bear 



