152 
The cirrus joints have a central constriction as in Catoptometra 
and Eudiocrinus, giving the cirri as a whole a characteristic knobby 
appearance; though this is not quite so marked as in those genera, 
there is no difficulty in distinguishing the cirri at once from those 
of any of the Himerometridæ, Tropiometridæ, or Thalassometridæ, 
and, because of the stoutness and the slightly bulbous ends of 
the joints, from those of any of the Antedonidæ. 
The brachials after the fourth or fifth have strongly produced, 
very finely spinous, distal edges, making the arm very rough as 
in Catoptometra and Eudiocrinus. Carpenter stated that the 
brachials are '””short, smooth, and obliquely quadrate”, and his 
figures bear out this description; in all the Singapore specimens, 
however, they are very short, in the proximal fourth of the arm 
wedge-shaped, in the distal portion oblong, as in Himerometra. 
The smoothness of the brachials and their quadrate shape in 
Carpenter's specimens are probably due to immaturity, as his 
specimens were very small. Specimens at hand from the Philip- 
pines, much larger than those from Singapore, resemble them in 
this, as in other respects. 
Another specimen taken with the preceding is similar, but 
has twenty arms, due to the presence of all the IIBr series, eight 
of which are 4 (3 — 4), and two 2, 
April 16, 1907. Fifteen specimens with seventeen to 
twenty-five arms 40 mm. to 50 mm. long; cirri XIII XX; IM Br 
series are present in all the specimens, 2, developed internally; 
IIBr all 4 (3 — 4). 
July 23, 1907. Two specimens; one resembles in general 
the first as described; the cirri are XXIII, 30, 15 mm. long; 
the arms are twenty in number 75 mm. long; seven of the ten 
IlBr series are 4 (3 + 4), one 2, the remaining two of a single 
joint each. The other specimen has twelve arms 50 mm. long, 
two IIBr series of 4 (3 + 4) being present; the brachials are 
somewhat wedge-shaped, rather longer than in the other specimen, 
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