Indian Deep-sea Dredging. 433 



Abactinal area covered with hexagonal tabulate paxillie, 

 which in the centre and in the interradial areas of the disk 

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

 arranged in longitudinal rows, those of the central row being 

 of predominant size. The papulee surround the paxillaj. 



The marginal plates are sliort 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-niarginals correspond in number, size, 

 and disposition with the supero-raarginals, 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 radiatino- 

 spines, and actinally two irregular longitudinal series of smaFl 

 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 

 YQ\j minute spinelets. Mouth-plates small and inconspicuous, 

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

 lets, and with numerous irregularly arranged spinelets on the 

 actinal surface, one of these being much enlarged. 



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. 



Station 115, 188 to 220 fathoms. 



Family Porcellanasteridas. 



POECELLANASTER, Wyville-Thomson. 



8. Porcellanaster cceruleus, Wyville-Thomson. 



Porcellanaster caruleus, Wyville-Thomson, Voy. Chall. Atlantic, vol i 

 p. 3/8, figs. 97 and 98; Sladeu, 'Challenger' Asteroidea, pp. 134- 

 138, pi. XX, ^^ 



One specimen from Station 113, 6SS fathoms. 



Colours in the fresh state .-—Abactinal membrane dull 

 blue, epiproctal tube and marginal plates light orano-e-pink 

 tube- feet and cribriform organs bright orange. '^ ' 



