00 Mr. A. Alcock on 



34r) fathoms, and our spocimcn bciiiL;- dreclgeil in tlie green 

 imul of the Andauiaii fSoa at 271 fathoms. 



23. Penfagonaster intennedius^ Perrier. 



Pentagonaster infennediua, rerricr. Noiiv. Archiv. du Mus. d'llist. Nat. 

 8t?r. ii. torn, vi., 1883, p. 2-J3, pi. v. fig. 5. 



From the Laccadive Sea, off Mimiikoy, 1200 fathoms, 

 coral and Glohujerina-oozc. 



Colour in the fresh state salmon-red. 



24. Pentagonaste}' piilvi'nus, sp. n. 



Rays 5. 11 = 22 r. R = 33 millim. in the 

 type specimen. 



Near Pentagonaster vu'rahilis, Perrier (Arch. Zool. exp(5r. 

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



Disk pentagonal, nnicli inflated abactinally and hollowed 

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

 t^trongly U])curved in the di.-<tal half. The strongly convex 

 abactinal surface of disk and rays is covered with hexagonal 

 or ])olygonal jdates, so close-set that, although their boundaries 

 are quite definite, no papula3 are visible on denudation nor 

 any papular pores, and all closely covered with angular 

 granules Avhicii show a distinctly paxilliform arrangement ; 

 the basal intcrradial jdates are more than twice the size of any 

 of the other abactinal plates, 



^larginal plates 17 in the uj)per, 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 

 marly equal-sized lamellar spinelets, and actinally with two 

 longitudinal rows of granules, and between these and the 

 furaow a row of three coarse spinelets, the adcentral (adoral) 

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

 late valves. 



Actinal surface deeply concave ; the actinal intcrradial 

 areas arc large ; the actinal intermediate jdates 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 intcrradial 

 plate, and is inconspicuous not merely because it is small. 



