92 Mr. A. Alcock on 



with a single close series of small squamous membrane-clad 

 granules lying nearly flush with tlie general surface ; the 

 central plates and the mid-radial plates to a point about 

 halfway along the ray are much enlarged, and usually bear a 

 central large coarse erect s])ine from 5 to 8 millim. in length, 

 and often also a large excentric pediceUaria formed of two 

 short-stalked spoons or obovate leaves ; the plates elsewhere 

 are small and occasionally carry a pedicellaria, but never a 

 spine ; papulae emerge everywhere between the plates, but 

 much more numerously in the centre and along the margin of 

 the disk. 



Marginal plates quite smooth, edged like the abactinal 

 plates with squamous granules. 



The supero-marginal plates number 20, excluding the 

 globular terminal plate, and are entirely lateral and vertical 

 throughout; they are tumid, and each carries at its abactinad 

 end a large coarse sharp spine, from 5 to 9 millim. long, 

 standing rigidly outwards almost at right angles to the ray ; 

 at the tip of the ray the plates have two spines ; many of the 

 plates have also one of the large pedicellarias formed of two 

 spoons or obovate leaves. 



The infero-marginals correspond plate to plate with the 

 supero-marginals in the interbrachial arcs, but not in the 

 distal half of the ray ; each bears on a central eroded 

 eminence one or two, occasionally three, coarse spines, not 

 quite so long as those of the supero-marginal series, and 

 differing from them in having the points bifid or trifid ; a few 

 of the plates carry also one of the large obovate pedi- 

 cellarise. 



The adambulacral plates, which, in addition to the edging 

 of squamous membrane-clad granules, have a distantly 

 granular surface, bear a furrow-comb of eight to ten close 

 truncate spinelets, and actinally a transversely arranged pair 

 of large spines (PI. VI. fig. 7) equal in length to those of the 

 infero-marginal series, and, somewhat like them, ending in 

 swollen multifid points not unlike the long spines of Doro- 

 cidaris hracteata or of Goniocidaris florigera ; a few of the 

 plates have also one of the large pedicellaria^. Mouth-plates 

 with the central (adoral) furrow-spine enlarged — 4 millim. 

 long in the type specimen — and each witli one large " flori- 

 gerous " spine actinally. 



Actinal interradial areas large, extending to the eighth 

 infero-marginal plate ; the actinal intermediate plates are 

 arranged in concentric chevrons or semicircles, in addition 

 to the edging of squamous granules they often have an 

 incomplete second marginal series of granules, and occa- 



