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first terminal, but becoming median on about the fifth or sixth; on the antepenultimate segment 
this becomes a single small median spine; the opposing spine is long, median, erect, very 
much longer than the minute spine on the preceding segment, equal to about half the lateral 
diameter of the penultimate segment in height; the terminal claw is about half again as long 
as the preceding segment, stout in the basal third but becoming slender in the distal two-thirds, 
strongly curved basally but becoming nearly straight distally; the dorsal surface of the cirri is 
broad and flat, rather abruptly separated from the lateral surface. 
The radials are almost entirely concealed by the centrodorsal ; the IBrj is very short, 
three and one half times as broad as long, widely separated from its neighbours laterally ; the 
IBr^ is broadly pentagonal, twice as broad as long; the synarthrial tubercles are moderately 
developed. The dorsal surface of the arms is almost smooth. 
P„ is absent; Pj is 9 mm. long with 24 segments of which the first is twice as broad 
as long and the following gradually increase in length becoming about as long as broad on 
the fourth and thereafter slightly longer than broad. ?„ is similar, but slightly longer and 
slightly stouter. P., is similar, but somewhat smaller and shorter than P^, 7 mm. long with 16 
segments; Pj is 4.5 mm. long with 15 segments of which the distal are elongate; the following 
pinnules are similar; the distal pinnules are very slender, 12 mm. long. 
The colour is yellow brown with purplish blotches on the arms; the outer half of the 
cirri is purplish. 
Another specimen has 14 arms 120 mm. long; all four of the IIBr series are 4(3 + 4); 
the cirri are XVI, 23 — 24 (usually 23), 15 mm. long; the dorsal pole of the centrodorsal is 
slightly concave, 3 mm. in diameter. Pj is 8 mm. long. P„ is 9.5 mm. long with 22 segments. 
P., is 6.5 mm. long. Pj and the following pinnules are 4.5 mm. long, very delicate; the large 
proximal pinnules are somewhat stiffened. The distal pinnules are 9 mm. long. The colour is 
the same as in the preceding. 
The third specimen is small; it has 10 arms 55 mm. long. 
Cyllometra A. H. Clark. 
Key to the Species of the Genus Cyllometra. 
a^ The proximal cirrus segments are longer than broad, and may be twice as 
loner as broad or even longer 
b' cirri of moderate length and stoutness, the distal segments broader than 
long; the cirrus segments beyond the basal bear long and prominent ' 
dorsal spines which at first are simply forked, then usually tridentate, 
later transforming into a high dorsal process with a straight edge 
parallel to the distal border of the segment, which gradually becomes 
a simple high dorsal spine; 11—20 arms (Philippine Islands). . disciforiiiis 
b" cirri long and slender with the distal segments longer than bmad and 
bearing minute dorsal tubercles; usually 25 — 30 arms (Lesser Sunda 
Islands) gracilis 
