90 Mr. A. x\lcock on 



345 fathoms, and our specimen being dredged in the green 

 mud of the Andaman Sea at 271 fathoms. 



23. Pentagonaster {ntermedius, Perrier. 



Pentayonaster intenneditis, Perrier. Nouv. Arcbiv. du Mus. d'Hist. Nat. 

 ser. ii. torn, vi., 1883, p. 2J3, pi. v. fig. 5. 



From the Laccadive Sea, off Minnikoy, 1200 fathoms, 

 coral and Glohic/erina-ooze.. 



Colour in the fresh state salmon-red. 



24. Pentagonaster ijulvinus^ sp. n. 



Rays 5. R = 2-2 r. E = 33 millim. in the 

 type specimen. 



Near Pentagonaster omrabih's, Perrier (Arch. Zool. exp^r. 

 vol. v., 1876, p. 40). 



Disk pentagonal, nuich inflated abactinally and hollowed 

 actinally ; rays relatively long and narrow, blunt-pointed, 

 strongly upcurved in the distal half. The strongly convex 

 abactinal surface of disk and ra3's is covered with hexagonal 

 or polygonal plates, so close-set that, although their boundaries 

 are quite definite, no papulas are visible on denudation nor 

 any papular pores, and all closely covered with angular 

 granules whicli show a distinctly paxilliform arrangement ; 

 the basal interradial plates are more than twice the size of any 

 of the other abactinal plates. 



Marginal plates 17 in the upper, 19 in the lower series, 

 measured from mid-interbrachium to tip of ray, all very 

 closely and uniformly covered with granules except the 

 terminal six to eight in the supero-marginal series, which 

 have a central smooth oval boss. 



Adambulacral plates with a furrow-comb of about seven 

 nearly equal-sized lamellar spinelets, and actinally with two 

 longitudinal rows of granules, and between these and the 

 fuKi'ow a row of three coarse spinelets, the adcentral (adoral) 

 of which is often replaced by a pedicellaria with two spathu- 

 late valves. 



Actinal surface deeply concave ; the actinal interradial 

 areas are large ; the actinal intermediate plates extend to the 

 fourteenth infero-marginal, they are large and roughly quad- 

 rangular, and are so closely covered with granules that their 

 limits are not easily discerned. 



Anus very indistinct. Madreporiform plate small and also 

 very indistinct ; it lies outside a much larger basal interradial 

 platCj and is inconspicuous not merely because it is small, 



