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



First radials just visible ; the second partly free laterally and deeply incised by the 

 sharp proximal angles of the axillaries, which are longer than wide. Both joints are 

 very sharply convex and almost carinate, but the axillaries are wider and have a more 

 rounded surface than the second radials, which are partly hidden beneath their lateral 

 angles. Both joints and also the first brachials have straight edges and flattened 

 sides. The inner sides of the second and the hypozygals of the third brachials are also 

 flattened. 



Ten arms; the first brachials somewhat incised for the sharp proximal angles of the 

 second, 1 both joints rising to their line of junction. The fifth and following joints smooth 

 and obliquely triangular, much longer than wide, the later ones becoming obliquely 

 quadrate. 



Syzygies in the third and sixteenth brachials, and then at intervals of three or four 

 joints. 



First pinnule much larger than the second ; its lower joints wide and thick, with 

 somewhat flattened outer sides. The third to fifth have their inner edges produced into 

 expanded processes which are slightly folded upwards. The next pair of pinnules are 

 rather larger than their immediate successors, but the following ones are quite small and 

 increase very slowly in length. 



Disk well plated and the brachial ambulacra slightly so ; pinnule-ambulacra without 

 very definite side plates ; the presence of sacculi uncertain. 



Colour in spirit, — light brownish-white. 



Disk 4 mm.; spread probably 10 cm. 



Zoca^'ty.— Station 175, August 12, 1874; near Kandavu, Fiji; lat. 19° 2' S., long. 

 177° 10' E.; 1350 fathoms; Globigerina ooze; bottom temperature, 36° F. Two 

 mutilated specimens. 



Remarks. — This type is unfortunately only represented by two calyces and half a 

 dozen arm-fragments with their pinnules mostly broken. No entire cirri are preserved, 

 and the position which I have assigned to this species among those with thirty to fifty 

 spiny cirrus-joints is therefore a somewhat conjectural one. But it has so many points 

 of resemblance with Antedon spinicirra and the two preceding species, that I have little 

 doubt respecting the character of its cirri. 



It is most closely allied to Antedon spinicirra (PL XL fig. l), but differs in the 

 sharper carination and the greater relative length of the axillaries (PL XL fig. 3). 



The second radials are much compressed laterally so that they appear, as it were, at 

 a lower level than the axillaries, the lateral angles of which overlap and partly conceal 

 them. Traces of this arrangement are visible both in Antedon spinicirra and in 

 Antedon bisptnosa. In the former species the enlargment and carination of the lower 



1 There is a considerable amount of variation in this respect. 



