92 ^Ir. A. Alcock on 



witli a single close series of small squamous membrane-clad 

 granules lying nearly flush with the general surface ; the 

 central plates and the mid-radial plates to a ])oint about 

 hallway ahmg the ray are much enlarged, and usually bear a 

 central large coarse erect spine from 5 to 8 millim. in length, 

 and often also a large excentric ])edicellaria formed of two 

 short-stalked spoons or obovate leaves ; the plates elsewhere 

 are small and occasionally carry a pedicellaria, but never a 

 spine ; ])apnlre emerge everywhere between the plates, but 

 much more numerously in the centre and along the margin of 

 the disk. 



^larginal plates quite smooth, edged like the abactinal 

 j)latcs with squamous granules. 



The supero-marginal plates number 20, excluding the 

 globular terminal plate, and are entirely lateral and vertical 

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

 end a large coarse sharj) si)ine, 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 tlie 

 plates have also one of the large pedicellarige 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 scries, 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 scries, and, somewhat like them, ending in 

 swollen multifid points not uidike the long spines of Doro- 

 cidaris bracteaia or of Goniocidaris floricjera ; a few of the 

 plates have also one of the large pedicel larite. Mouth-plates 

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

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

 gerous " spine actinally. 



Actinal interradial areas large, extending to the eighth 

 infero-marginal plate ; the actinal intermediate ])lates 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- 



