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



9. Porcellanaster, sp. prox. cceruleus, Wy.-Tlioms. 



Numerous small specimens from Station 111, 1664 fathoms, 

 and Station 117, 1748 fathoms, may perhaps be the young of 

 P. caruleus. The epiproctal tube is of great length, the 

 abactinal membrane, which is fragile, has the spinelets con- 

 fined to a very narrow band in the middle of each interradial 

 space, and the supero-marginal plates, though strongly bossed, 

 are unarmed. 



Styracaster, Sladen. 



10. Styracaster horridus^ Sladen. 



Styracaster luirridus, Sladen, 'Challenger' Asteroidea, pp. Io0-lo2, 

 pi. xxiii. tigs. 5-7, pi. xxvii. figs. 17-20. 



8i)ecimens from Stations 117, 1748 fathoms, and 118, 1803 

 fathoms. 



In our specimens only a few of the adambulacral plates, 

 near the adcentral end of the ray, have four spines in the 

 furrow-series, the majority have three, and tlie most distal 

 only two. Specimens with the stomach distended show no 

 epiproctal elevation ; but those with the stomach empty have 

 a distinct elevated cone, in one case bilobed. 



Colour in the fresh state pale yellowish pink. 



11. Styracaster clavipes, sp. n. 



Agrees with S. armatvs very closely, but differs in tlie 

 following particulars : — There are five cribriform organs in 

 each interbrachial arc ; the infero-marginal plates are not 

 much longer than broad ; the terminal plate of tlie ray is 

 markedly inflated ; the median spines of the coalescent 

 sujjero-marginal rays are comparatively short and blunt. 



In general " habit " it is well distinct from S. armatus, 

 Sladen, of which species there are in the ' Investigator ' col- 

 lection two fine specimens dredged in 1888, in 1840 to 1924 

 fathoms, in the Bay of Bengal. 



Colour in the fresh state pale yellowish ]iink. 



One specimen from Station 117, 1748 fathoms. 



Ihl'llALASTEK, Sladen. 



12. Hyphalaster tara, sp. n. 



Bays 5. B = 2r. 



Ea}s short, squat, slightly inflated terminally. Disk large, 

 strongly inflated, with a .-hort, tapering, epiproctal tube. 



