430 Messrs. J. Wood-Mason and A. Alcock on 



and bear medially, except in the peripheral third of the ray, 

 each a long adpresscd styllform spine. 



Adambulacral plates ralher long, each with a furrow-series 

 of six obtuse spinelets, and with a mass of small spinelets, 

 which form often three longitudinal series, actinally. Mouth- 

 plates large, prominent, the suture between each pair widely 

 ojjen ; the innermost mouth-spine of each plate much enlarged ; 

 actinally each plate is covered with numerous small spinelets 

 in about three longitudinal series. 



Actinal interradial areas small, the plates covered witii 

 small papilliform spinelets, 



Madreporiform body situated near the margin of the disk 

 and almost entirely concealed by paxillse. 



Anal aperture small, central. 



Colour in the fresh state uniform light rose-madder. 



Station 117, 1748 fathoms. 



Peksephonastek, gen. nov. 



Allied to PlutonasteVy Sladen. 



Disk rather large, flat ; rays rigid. 



Marginal plates more or less covered with papilliform 

 spinelets, and bearing each one or more strong rigid sj)ines ; 

 the supero-marginals, which form a broad massive border on 

 the abactinal surface of the ray, directly superposed on the 

 infero-marginals, plate to plate. 



Abactinal area with close-set paxillte, which on the rays 

 are arranged in transverse rows without any definite median 

 series ; papulae distributed everywhere between the paxillte. 



Actinal interradial areas large, with intermediate plates 

 extending far along the ray. 



The adambulacral plates bear a furrow-series of obtuse, 

 compressed, slightly radiating spinelets, and actinally two or 

 more longitudinal series of papilliform spinelets. 



]\Iadreporiform body small, rather concealed, situated 

 distant from the margin of the disk. 



Anal ajjerture subcentral. 



No pedicellarife. 



5. Persepho7iaster crocciis, sp. n. 



PMo7iaster, ep., Wood-Mason nud Alcock, Ann. & Mag. Nat. Hist. 

 180], vi). p. 13. 



Eays 5. K = 4-5 r. 

 Eays moderately long, rigid. 



