356 THE VOYAGE OF H.M.S. CHALLENGER. 



Stem slender and of a rounded pentagonal form, without lateral grooves. Usually 

 seven internodal joints with scarcely crenulated edges and more or less marked horizontal 

 ridges, which are especially prominent on the larger joints. The nodal joints are deeply 

 hollowed by the cirrus-sockets, and have their angles slightly produced, so as to be lobate 

 in form. The sockets extend but very slightly either on to the supra- or on to the infra- 

 nodals. Cirri composed of forty to forty-five joints, the basal ones of which are not 

 specially broad, while their successors are often a trifle longer than wide. Interarticular 

 pores end at the sixth node. 



Basals relatively very large and convex, pentagonal or almost oblong in form. {N.B., 

 the preceding description is based upon one individual only.) Radials very variable, 

 sometimes only three or four, but usually five or even six, with the second and sometimes 

 also the fourth a syzygy. Most of the rays divide three times, giving from thirty to 

 forty arms, the longest unbroken ones of which consist of about fifty joints beyond the 

 palmar axillary. 



The dorsal surface of the skeleton is rather uneven, owing to the overlapping of the 

 joints and the elevation of their distal edges, especially between the radials and the 

 palmar axdlaries. Primary arms of six to twelve (generally eight or ten) joints. 

 Secondaries of seven to sixteen (usually ten or twelve) palmars. The third joint, but not 

 unfrequently the fourth or fifth, after each axillary is generally a syzygy. The next 

 syzygy in the free arms may be anywhere between the fifth and the thirtieth brachials, 

 and others follow at very irregular intervals. 



The radial pinnules vary in appearance according to their position, but the two lower 

 joints are larger and more cuboidal than the rest, which are flattened laterallj'. The 

 distichal and palmar pinnules are shorter than those on the radials, and gradually decrease 

 in size. Their dorsal edge is sharpened, but the two lower joints are broad and 

 expanded, as is also the case, though in a less degree, with the first pinnules on the free 

 arms. 



The disk is thickly covered with comparatively large plates, and the ambulacral 

 skeleton is well developed. The brachial ambulacra are withdrawn into the narrow arm- 

 groove, and but little plated independently of those of the pinnules, which have scpiarish 

 side plates and large, rounded, covering plates. 



Colour — a uniform dusky purple when fresh (Moseley), light grey when dry, almost 

 white in spirit. 



Locality. — Station 214, February 10 ,1875 ; off the Meangis Islands ; lat. 4° 33' N., 

 long. 127° 6' W. ; 500 fathoms ; blue mud ; bottom temperature, 41°"8 F. Two specimens. 



Remarks — I have much pleasure in associating this pretty little species \dih the 

 name of Prof. H. N. Moseley, F.R.S. Two specimens of it were obtained by the 

 Challenger. One of them, represented on PI. XLV., is evidently immature, as shown 

 by the relatively large size of its basals, the length of its lower and middle cirrus- 



