84 :Mr. A. Alcock on 



rays with one, or with two or three in a vertical series ; at 

 the base of the rays each plate usually bears on its extreme 

 abactinal edge one or two incipient pediccllariaj. 



Tiie infero-niaiginal plates correspond, ])late to plate, with 

 the supero-niarginals ; they are almost smooth in tlie middle 

 and arc covered with papilliform granules round the edge, and 

 are armed with from two to four stout accumbent spines in a 

 median vertical series, the most abactinad being the largest. 



Adambulacral plates with a strongly convex furrow-margin 

 armed with six to eight short, truncated, longitudinally- 

 grooved spinelets, and actinally with two longitudinal series 

 of similar spinelets, about five in each series ; these spinelets 

 are sometimes almost clavate. JMouth-plates small, very 

 narrow, with the suture widely open ; each with a furrow- 

 series of about ten spinelets, of which the most central (adoral) 

 is much enlarged, and with a single suture-series of eight or 

 nine barleycorn sjiinelets. 



Actinal interradial areas large, the intermediate plates 

 extending to about the eighteenth infero-marginal ; in the 

 interradial areas each plate carries a pedicellaria-like clump 

 of from six to eight truncate or clavate grooved spinelets, 

 and along the rays each usually carries two short longitudinal 

 series of similar spinelets. 



Madreporiform plate small and inconspicuous or quite 

 concealed ; placed about midway between margin and centre. 



Ambulacral groove very broad; tube-feet large, conical. 



The intestine is similar to that of P. croceus and opens by 

 a long narrow vent. 



Colour in the fresh state " crushed strawberry," with some- 

 times a golden suffusion ; marginal plates pink, tube-feet 

 blood-red. 



Laccadive Sea and Gulf of Manaar, 738 to 902 fathoms, 

 green mud. 



In a very young specimen a granular epiproctal tube is 

 observed. 



12. Persephonaster coelockiles, sp. n. 



Rays 5. R = 4-7o r. E,= 117 millim. in the 

 type specimen. 



Disk thin, flat, flexible; rays very broad at base, but 

 tapering to a flne point, thin and flat, with a remarkably 

 broad ambulacral furrow. 



Abactinal surface with close-set pasilla3 consisting of a 

 slender cylindrical column crowned by a thick brusli of 

 capillary spinelets ; the paxilke of the disk small and irrcgu- 



