416 



INFr. ^y. K. Fislior on a 



opaque web into a continuous series of twenty to twenty-four 

 for the two plates (median spinelets not enlarged) ; stiboral 

 webbed series, ?-form, of seven to nine spinelets, of which the 

 innermost are very much tlie longest. E,= 15 mm., r=ll mm., 

 R = l-36r; entire diameter 30 mm.; disk rather thin, but 

 arched radially ; rays broad, rounded. 



Description. — Abjictinal suiface ])aved with closely imbri- 

 cated plates, which decrease in size, centrifugally, from anal 

 region. Adcentral side of plates of papular area strongly 

 concave to admit the passage of the single papula. This 

 papular area includes the centre of disk (where the papulre, 

 on account of size of j)late, are more spaced) and a broad 



Fig. 1. 



Fier. 2. 



Fjg. 1.— Mouth-plates and first adambulacral plate. X 10. The .spines 

 are invisible in the dried specimen, as on the right of the figure. 



Fig. 2.— Three abactinal spinelets, 028, 0-17, and 0-135 mm. long, 

 respectively. X about 200, 



petaloid area on each ray which extends to within to 3"o mm. 

 of the ray-tip and excludes a marginal band of about the 

 same width. At the widest part the areas include 12 longi- 

 tudinal rows of plates and twelve longiseries of papula?. 



The plates of two radial or carinal series are imbricated, so 

 that the concavity faces towards the margin and adcentrally— 

 hence away from the radial line. Those of the five longi- 

 series on either side have the concavity facing adcentrally, 

 but towards the radial line. This causes the two radial series 

 to be marked off from the others. The plates of the papular 

 area have a crescentic group of numerous very ^me, spicules 



