!69 
2. ^Itclecrinns auoi>m/iis A. 11. Clark. 
A. M. Cl..\KK. Notes from the Lcyilcii Museum, vol. 34, 1912, p. 153. 
Stat. 177. 2^24'.5.S., I29°38'.5 E. Ceiam Sea. 1633 Metres, i E.\. 
Centrodorsal very long, about i.S mm. br(3ad at the base and 3 mm. loncj radially, 
cylindrical in the j)r<).\inial ihirtl, trom that point onward (beginning;- rather abruptly) conical; 
the ape.\ is rounded. The cirrus .sockets are moderate in size, and are arranj^ed in ten evenly 
spaced columns, three (rarely two or four) to a column. Each column is separated from its 
neighbors in the same column by about the distance 
that the columns are apart. The surface of the centro- 
dorsal is smooth and undifferentiated ; the cirrus sockets 
are simple excavations, without the raised borders 
usually found in the species of this genus; in each 
cirrus socket just above the middle a half conical 
ridge makes in from either side; these ridges are 
trianoular in outline, the aiie.x of the triangle abutting 
on the central canal. The ligament areas above 
(^proximal to) these ridges are rounded proximally, 
the sides converging in a sharp angle at the central 
canal; their area is approximately equal to. that of 
the ridges ; the ligament areas below (distal to) these 
ridges are shallower, occupying about half the area 
of the cirrus socket or rather more. The iuterradial 
portions of the centrodorsal just below the basals are 
slightly raised above the general surface, so that a 
section of the centrodorsal through the base is rounded- 
pentagonal. The cirrus sockets occur almost exclusively 
on the conical outer two thirds of the centrodorsal. 
The cirri are XXX, 19 — 20, about 13 mm. 
long; the first two segments are about twice as broad as long, the third is slightly broader 
than long, or about as long as broad, the fourth is twice as long as the diameter of its ends, 
the fifth is nearly or ([uite three times as long as the diameter of its ends, and the sixth is 
slightly shorter; the following decrease gradually in length, so that the fourteenth and following 
are only slightly longer than broad; the fourth-seventh are moderately constricted centrally, 
but this central constriction disappears in the next two or three following, when the cirri 
become strongly compressed laterally. The opposing spine is terminal, small and blunt. The 
terminal claw is slightly longer than the penultimate segment, rather stout, evenly tapering, 
and rather strongly curved. 
The short cirri of the species, which have short segments distally and a stout strongly 
curved terminal claw, are very different from the very long and slender type heretofore 
supposed to be characteristic of the species of Atelecrinns. It seems that in Atelccrinus we 
Fig. 17. 
Lateral view of a specimen of Alilarinus aiiomalus 
from Stat. 177. X 6- (Courtesy of the U. S. National 
Museum). 
