A MONOGRAPH OF THE EXISTING CRINOIDS 137 



axillary. The IIBr series are 2 and resemble the IBr series. The two ossicles immedi- 

 ately following each a.xillary are united interiorly in their proximal two-thirds, their 

 inner borders then diverging at an angle of 90°. 



The 16 arms are about 70 mm. long. The first eight or ten brachials have a 

 distinct, though low and rounded, gablehke median keel, and the brachials following 

 have the distal edge very slightly produced and armed with excessively fine spines. 



Pi is 6 mm. long with 16 segments of which the first is very short, the second is 

 about as long as broad, and those following slowly increase in length, becoming about 

 three times as long as broad terminally. The pinnule is slender and delicate, and 

 tapers gradually from the base to a very slender tip. P^ is absent. P2 is much 

 stouter and stiffer than Pi, 12 mm. long Avith 18 segments of which the first is twice as 

 broad as long, the second is about as long as broad, and those following gradually 

 increase in length to the eighth, which is twice as long as broad, and the terminal, 

 which are somewhat longer. The segments in the outer half of the pinnule have 

 the distal ends armed with a conspicuous everted border of fine spines which are 

 longest on the side toward the arm tip. P3 is 11.5 mm. long with 17 segments, and 

 resembles P2. P4 is 7.5 mm. long with 15 segments and resembles the two preceding 

 pinnules, but is more slender, especially in the distal half. 



The color in alcohol is purplish brown vaguely blotched with Ughter; the cirri are 

 whitish. 



Notes.- — Three additional specimens have 16-f , 14 + , and 11+ arms. 



Comparisons. — This new species is at once distinguished from all the other species 

 in the genus by the long cirri which are composed of very numerous segments. In 

 the character of its cirri it comes nearest C. soluta, but the cirri are longer with more 

 numerous segments and longer dorsal spines, P3 resembles P2 instead of being much 

 shorter and more slender, and the distal ends of the pinnule segments are much 

 more spiny. 



Locality. — Investigator station 535; Mergui Archipelago, west of Tavoy Island (lat. 

 13°04'30" N., long. 96°44' E.); 119 meters; sand and mud; April 17, 1913 (4). 



CYLLOMETRA MANCA (P. H. Carpenter) 



Plate 17, Figure 86; Plate 18, Figure 87; Plate 19, Figures 91-96; Plate 20, Figures 99, 100; 

 Plate 21, Figure 101; Plate 22, Figures 102-108 



(See also vol. 1, pt. 1, fig. 262 (centrodorsal), p. 257; figs. 346-348 (cirri), p. 289; fig. 478 (radial pen- 

 tagon), p. 363; pt. 2, figs. 54, 55 (radial pentagon), p. 33; figs. 488, 489 (pinnule tip), p. 273; 

 figs. 776-778 (ambulacral deposits), p. 366; pi. 2, figs. 969, 970 (radial pentagon).] 



Aniedon sp. P. H. Carpenter, Proc. Roy. Soc, 1879, p. 384; Bull. Mus. Comp. Zool., vol. 9, No. 4, 

 1881, p. 155 (specimen with defective pinnulation [lacking P.] dredged by the Challenger). 



Antedon manca von Graff, Challenger Reports, Zoology, vol. 10, pt. 27, 1884, pp. 18, 61 (Challen- 

 ger station 192; myzostomes). — P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 

 1888, p. 226 (description; station 192; remarks), pi. 44, figs. 2, 3. — Braun, Centralbl. Bak- 

 teriol. und Parasitenk., vol. 3, 1888, p. 210 (myzostomes; from von Graff). — Hartlaub, Nova 

 Acta Acad. German., vol. 58, No. 1, 1891, p. 36 (in key), p. 42 (compared with A. [Petasometra] 

 clarae).—A. H. Clark, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 131 (refers especially to a/6opt/r- 

 pwrea; considered as including disn/ormis and darae). — Hamann, Bronns Klassen und Ordnun- 

 gen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1581 (listed).— A. H. Clark, Crinoids of the Indian 

 Ocean, 1912, p. 34 (identity). 

 724008 — 47 10 



