REPORT ON THE CRINOIDEA. 361 
Stem slender and pentagonal in outline, with slight re-entering angles. Generally 
seven or eight internodal joints with distinctly crenulated edges. Their relatively high 
sides are somewhat hollowed, and smooth or marked with faint ridges ; while their angles 
are sharpened and a little produced outwards, so that the whole stem is traversed by five 
well defined interradial ridges. 
The supra-nodals are but slightly incised, and the wide cirrus-facets do not reach the 
upper edges of the nodal joints. They likewise barely reach the lower edges, coming 
much nearer to them in some specimens than in others ; and the infra-nodals are scarcely 
grooved, so that their re-entering angles are but little more marked than those of the 
other internodal joints. 
Cirri composed of about forty joints, the first two of which are short and wide, while 
the eighth and a few following ones are sometimes a little longer than wide. The lower 
cirri do not seem to be specially shorter than the upper. Interarticular pores not 
visible below the tenth node. 
The basals (in the only specimen possessing them) appear as small rhomboidal knobs 
with their pointed lower extremities resting on the interradial ridges at the top of the 
stem ; but they extend laterally and meet their fellows in the re-entering angles between 
the first radials. The rays consist of six rounded joints, of which the second and fourth 
are syzygies, and are well separated laterally above the hypozygals of the second radials. 
They all divide three times, and there are generally additional axillaries on the two outer- 
most of each set of four tertiary arms thus produced, so that the total number of arms 
reaches about sixty. They consist of about one hundred joints above the palmar 
axillaries, and are almost smooth in the medio-dorsal line till near the ends, which are 
slightly serrate. 
The distichals, palmars, and lower brachials present a peculiarity which is, much more 
marked in the baseless individual than in the more normal one. The pinnule-bearing 
side of each joint is slightly bent outwards above the pinnule-socket, and its edge is cut 
into several small teeth or spines. In addition to this the front edge of each joint and 
the corresponding part of the hinder edge of its successor are slightly raised on one or 
both sides, and are also more or less spinose. These characters are perhaps most distinctly 
marked upon the palmars, not being fully developed upon the distichals, and disappearing 
a little beyond the level of the tertiary axillaries. Six or eight joimts in the primary 
arms ; secondaries of eight to fourteen (usually ten or twelve) palmars. The next division 
(when present) may be from eight to twenty (generally twelve to sixteen) joints, and in 
one case there is another axillary after sixteen joints more. The third joint after each 
axillary is usually a syzygy. The next syzygy in the free arms may be anywhere 
between the sixth and thirtieth brachials, after which an interval of three to eighteen 
joints occurs between successive syzygies. 
The pinnules on the radials and first distichals are large and massive, consisting of 
(ZOOL, CHALL, EXP.—PART XXx1I.—1884.) ii 46 
