A MONOGRAPH OF THE EXISTING CRINOIDS 345 



very thin, 3 mm. in diameter. The cirri are arranged in a single marginal row, which 

 is deficient in two places. The cirri are XVI, 12-13, 8 mm. long, and rather weak. 

 The first segment is short, the second is from half again to twice as broad as long, 

 the third is as long as, or slightly longer than, broad, the next 2 or 3 are about half 

 again as long as broad, and the remainder are about one-third longer than broad. 

 The color in alcohol is brown, each arm having a white mediodorsal stripe; regener- 

 ating arms and portions of arms are brownish white. 



The specimen from the Kei Islands expedition station 90 is of the slender-armed 

 type; the anterior arms are 120 mm. in length. 



The 3 specimens from the Kei Islands expedition station 85 are all of the slender- 

 armed type and are light brown in color, with a light mediodorsal stripe bordered on 

 either side with darker. In one the 10 arms are 115 mm. in length; the cirri are 

 XVI, 15, from 14 to 15 mm. long; P 2 and P 3 have the first-third, especially the second, 

 segments strongly carinate. A second specimen is of about the same size, but has 

 11 arms, one IIBr 2 series being present; the cirri are XIII, 15. The third specimen 

 is smaller, with the 10 arms 85 mm. long; the cirri are XI, 13. 



The specimen from the Kei Islands expedition station 73 has 10 arms up to 150 

 mm. in length; the cirri are V (with numerous additional more or less undeveloped), 

 13-15. 



Of the 6 specimens from the Kei Islands expedition station 67, one has 17 arms, 

 of which 8 are small and regenerating. Another has 16 arms; of the 6 IIBr series 

 present 1 is of full size, 1 is almost of full size, 2 are half grown, and 2 are small. 

 The last 2 are situated on a small IBr series, which apparently is regenerating. All 

 of the IIBr series are 2 (1 + 2). The arms were probably about 140 mm. long. The 

 centrodorsal is thin discoidal, oval, sunken in the center, and measures 5 by 3.5 mm. 

 The cirri are XIII, 12, with the distal half moderately compressed laterally and 

 moderately recurved. This specimen is light in color and is of the slender armed 

 type. A very large specimen has the 10 arms probably 190 mm. long; the arms are 

 broadened basally, becoming 4.5 mm. wide at about the fourteenth brachial, thence 

 slowly tapering distally. There is a trace of a low, blunt, median keel. The centro- 

 dorsal is thin discoidal, slightly concave dorsally, 4 mm. broad. The cirri are XVI, 

 12-13, with several more incompletely developed; they are slender and weak, from 

 10 to 15 mm. long. The color is deep purple, with the regenerating arm tips yellow 

 brown. Another has the 10 arms moderately stout, the longest 155 mm. long; the 

 cirri are XIX, 14, rather strongly recurved distally. Another specimen is similar to 

 this but slightly smaller. The last specimen resembles that preceding, but has 11 

 arms. 



One of the specimens from the Kei Islands expedition station 111 has 10 arms 

 190 mm. long. The arms are stout, though not so stout as in the extreme of the 

 stout-armed form; they increase slowly in width to about the twelfth brachial, thence 

 taper slowly distally and become slender in the outer third. There is a trace of a 

 median dorsal carination. The centrodorsal is thin discoidal, 3.5 mm. in diameter. 

 The cirri are XVI, 10-12, rather weak and slender. In another the arms are 170 

 mm. long, stout, 3.3 mm. broad at the base and increasing in width to 4 mm. at the 

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