ASTE EOIDEA OF H.M.S. ' CHALLENaEB ' EXPEDITIOJS^. 257 



longer than tlie pedicel, and do not usually radiate apart widely. 

 In consequence of the rather wide separation of the paxillse, a 

 somewhat " draggled " appearance is produced. In the centre 

 of the disk the paxillse are rather smaller and more crowded, and 

 a central prominence is present. 



Madreporiform body small, and almost concealed by paxillse, 

 situated rather more than its own breadth from the margin. 



Ambulacral sucker-feet moderately robust and with conical 

 pointed tips. 



Terminal (ocular) plate rather large, and broader than long ; 

 distinctly appearing as if formed by the lateral union of two 

 spmicylindrical plates, with a rather large tubercular granule on 

 either side at the extreme tip, on which spinelets were probably 

 articulated. 



Colour, in alcohol, yellowish grey, with a darker tint over the 

 paxillar area approaching greenish grey. 



Station 204. Lat. 12° 43' N., long. 122° 10' E. Depth 100- 

 115 fms. ; mud. 



AsTROPECTElsr HEKMATOPHILTJS, n. sp. 



Eays five. JR>3r; i2=25 millim,, r=8 miUim. Eays of 

 moderate breadth, tapering from the base to the extremity, but 

 do not become attenuate or sharply pointed. Breadth of a ray 

 at the base 8'5 millim. Interbrachial angles slightly rounded. 



Supero-marginal plates 22 or 23 in number from the interbra- 

 chial line to the tip, slightly broader than long; height greater 

 than length, and increasing on the inner portion of the ray, where 

 it is greater than the breadth. The plates are slightly tumid 

 and well defined ; and are covered with low rounded granules, 

 which are larger and more prominent in the middle of the plate. 

 Normally each plate bears a prominent spiniform granule on the 

 rounding between the dorsal and lateral surfaces ; and occasion- 

 ally a second may be present close beside it. Usually one or 

 two of the innermost plates on either side of the median inter- 

 brachial line carry two of these spiniform granules, of equal size. 



The infero -marginal plates do not protrude beyond the line of 

 the superior series, and are gently rounded on to the actinal 

 area. Each plate has a single, short, slightly compressed, and 

 sharply tapering marginal spine, followed by two similar but 

 shorter spinelets, placed close behind and forming a line slightly 

 oblique to the median line of breadth of the plate. The second 

 spine is about two thirds the length of the marginal spine, and 



