268 
centrodorsal is viewed dorsally. Their height is scarcely more than sufficient to modify the 
normally circular base of the centrodorsal to a pentagon. 
The basals form a very narrow band of almost uniform height between the radials and 
the centrodorsal, though they are slightly higher than elsewhere in the angles of the calyx 
where their dorsal surface is raised to form a proximal continuation of the interradial ridges 
on the centrodorsal. 
The radials are relatively long, distally scarcely twice as broad as long in the median 
line; in lateral view the profile of the dorsal surface is straight; the proximal edge is somewhat 
shorter than the distal. 
The IBi', is regularly oblong, about one third again as broad as long, entirely free basally ; 
there is almost no incision of the proximal border; the distal lateral angles are slightly out away. 
The axillaries are broadly pentagonal, slightly broader than long; their lateral edges 
slope slightly inward and downward so as to form, with the truncated anterior corners of the 
IBrj, prominent water pores; similar pores occur between the first and second brachials, interiorly. 
The visceral mass is high and narrow, and the ambulacra reach the arms along the 
summits of mesentary-like perisomic bridges as in Gepiiyrocrimts and in Thalassoa'imts. The 
mouth is centr.al. The disk is unplated. 
The arms resemble those of Atelecrinus wyvillii\ syzygies usually occur between 
brachials 3 + 4, 6 + 7 and 10 + 11, and distally at intervals of three or four oblique 
muscular articulations. 
The lowest pinnule (on two arms) is on the sixteenth brachial ; the pinnules are small 
and weak, long-jointed and strongly flattened. 
"Albatross" Stat. 5619. 0°35'oo"N., 127° 14' 40" E., (Molucca Passage; March Island bearing 
S. 78° E., 7 miles distant); 435 fathoms (783 Metres); fine gray sand and mud. 
A specimen collected by the "Albatross" near the locality where the type was dredged 
by the "Siboga" appears to belong to this species. The centrodorsal is somewhat more sharply 
pointed. There are the same interradial furrows. The proximal interradial ridges, though 
prominent, are more rounded. The basals are visible only in the interradial angles of the 
calyx, in the form of low triangles with excessively produced lateral apices, which fail to meet 
the similarly produced apices of those on either side. The radials are considerably shorter 
than those of the type, and when the specimen is viewed laterally their dorsal profiles make 
considerably more than instead of less than, a right angle with each other. The ossicles of the 
IBr series are slightly shorter than those of the type, and the brachials also are proportionately 
slightly shorter. This gives the animal a more robust and compact appearance. 
Afelecriints sukatus differs from A. zvyvillii in having the centrodorsal, basals and 
radials all in intimate contact, there being no perisomic lacunae as in A. wyvillii. The centro- 
dorsal differs from that of A. wyvilli in its more sharply conical form, its pentagonal base 
with interradial ridges proximally, passing into interradial furrows between the cirrus sockets, 
the greater height of the lateral ridges bordering the cirrus sockets, and the absence of notches 
on the proximal border. 
