Indian Deep-sea Dredging. 433 



AbactiiKil area covered with hexagonal tabulate paxill e, 

 which in the centre and in the interradial areas of the di.sk 

 are much smaller than elsewhere, and which on the rays are 

 arranged in longitudinal rows, those of the central row being 

 of predominant size. The papulas surround the paxillee. 



The marginal ])lates are short and broad. The supero- 

 marginals, about 42 in number, occupy on each side more 

 than one third of the abactinal surface of the ray, and 

 are uniformly covered with large granules without other 

 armature. The infero-marginals correspond in number, size, 

 and disposition with the supero-marginals, plate to plate, and 

 are uniformly covered with spine-like granules, of which two 

 or three in a longitudinal row near the suture with the supero- 

 marginal plate are enlarged. 



Ambulacral plates with a furrow-comb of five long radiating 

 spines, and actinally two irregular longitudinal series of small 

 spines, of which one in each series is much enlarged, except 

 in the distal half of the ray, where one in the outer series 

 only is enlarged ; outside these is a third irregular row of 

 very minute spinelets. Mouth-plates small and inconspicuous, 

 eacli with a furrow-series of six equal moderate-sized spine- 

 lets, and with numerous irregularly arranged spinelets on tlie 

 actinal suiface, one of these beino- much enlaru:ed. 



Actinal interradial areas large, the intermediate plates 

 extending to about the tenth infero-marginal ; they are 

 arranged in columns, and their surface is covered with spines, 

 of which one in each plate is much enlarged. 



Anal aperture small, subcentral. 



Madreporiform body very small, situated midway between 

 the margin and the centre of the disk. 



Colour in the fresh state uniform pink. 



iStation 115, 188 to 220 fathoms. 



Family Porcellanasteridje. 

 PORCELLANASTEE, Wyvillc-Thomson. 



8. Porcellanaster cceruleus, Wyville-Thomson. 



Porcellannster canUeus, Wyville-Thomson, Voy. Cball. Atlantic, vol. i. 

 p. 378, figs. 07 and 98 ; Sladen, 'Challenger' Asteroidea, pp. 134- 

 138, pi. XX. 



One specimen from Station 113, 083 fathoms. 



Colours in the fresh state : — Abactinal membrane dull 

 blue, epiproctal tube and marginal plates light orange-pink, 

 tube- feet and cribriform organs bright orange. 



