80 THE VOYAGE OF ILM.S. CHALLENGER 



abraded (?). On some of the plates on the inner part of the ray there is a small rudi- 

 mentary lateral spinelet, which, although much larger than the other spinelets on the plates, 

 is scarcely discernible without a magnifying glass. This does not appear to be present on 

 all the plates, and I find no trace of its existence on the outer part of the ray. In the 

 interbrachial arcs two or three plates bear very large pedicellarian apparatus formed of 

 three or four comparatively long and robust spines. This is usually placed near the 

 junction of the infero-marginal with the supero-marginal plates ; and there may occa- 

 sionally be one similarly placed further out on the ray. 



The adambulacral plates are long and very narrow, with the furrow margin very faintly 

 convex. Their armature consists of: — (1.) A furrow series of five or six short, cylindrical, 

 obtusely tipped spinelets, subequal in size, except the outer one of the series, which is 

 sometimes smaller. They appear to stand parallel to one another, forming a compact 

 series, and the successive series are widely spaced apart. (2.) Immediately behind the 

 furrow series, on the actinal surface of the plate, is a lineal series of three or four spinelets 

 precisely simdar in size and form, closely appressed to the furrow series ; and there are no 

 other spinelets or granules on the adanibulacral plates. 



The mouth-plates are large and elongate. The pair together are slightly convex 

 actinally, and the median suture is widely open. The armature consists of a marginal 

 series of nine or ten small, short, obtuse, papilliform spinelets on each plate, the innermost 

 one of which is rather larger and more robust than the others. On the actinal surface of 

 the plates are a few irregularly placed papilliform granules, showing to a certain extent a 

 tendency in places to form a second series behind the marginal series ; one or two of the 

 papilla) at the anterior end of the plate are larger than the others. 



The actinal interradial areas are remarkably small and limited ; and there are not more 

 than from four to six very small intermediate plates in each. These plates bear small, 

 isolated, papilliform granules, and there may be two or more pedicellarian apparatus, 

 similar to those described in the interbrachial arcs, in each area. 



The tube-feet have a terminal knob, which is large when compared with the small size 

 of the Asterid. 



The anal aperture is slightly excentric and difficult to distinguish. 



The madreporiform body is rather large, and with very coarse striations, and is situated 

 close to the marginal plates. It is more or less concealed by paxillse. 



Colour in alcohol, clear white. 



Locality. — Station 198. In the Celebes Sea, between Celebes and Mindanao. October 

 20, 1874. Lat, 2° 55' 0" N., long. 124° 53' 0" E. Depth 2150 fathoms. Blue mud. 

 Bottom temperature 38°"9 Fahr. ; surface temperature 85 o, Fahr. 



Remarks. — There seems to me little doubt that this is an immature specimen. Still it 

 is very distinct from any species hitherto known, and its characters have appeared to me 

 sufficiently well-marked to justify its recognition by name. At first sight the marginal 



