A MONOGRAPH OF THE EXISTING CRINOIDS 163 



entirely united interiorly. The first syzygial pair (composed of brachials 2 + 3) is 

 oblong, nearly twice as broad as long. The next 4 brachials are oblong, three times as 

 broad as long, usually somewhat tubercular. The following brachials are very short, 

 wedge-shaped, about twice, as broad as the longer side, soon becoming shorter and 

 more oblong, and in the outer half of the arm regularly oblong and very short, about 

 four times as broad as long, increasing somewhat in length, though remaining oblong, 

 terminally. The brachials after the sixth or seventh have prominently everted 

 edges which are armed with numerous fine spines. 



Syzygies occur between brachials 2 + 3, again from between brachials 16+ 17 to 

 between brachials 31+32 (usually in the vicinity of the twenty-first brachial), and 

 distally at intervals of from 5 to 9 (usually 6 or 7) muscular articulations. 



The mouth is marginal or submarginal, radial or nearly so. The anal tube is 

 central or approximately central. The disk, which is from 15 to 30 mm. in diameter, 

 is naked or bears a few calcareous nodules. 



P D is about 30 mm. long, stout basally but rapidly becoming slender. It is 

 composed of about 70 segments which at first are considerably broader than long but 

 gradually become proportionately longer and after the tenth about as long as broad. 

 The terminal comb is comparatively inconspicuous. It arises gradually and is 

 composed of 9-11 small low rounded teeth. The following pinnules decrease rapidly 

 in length and stoutness to P 3 , which is 7 mm. long, very slender, and composed of 

 about 30 segments. The succeeding pinnules are slightly stouter, at first of about 

 the same length, later slowly increasing in length, so that the distal pinnules are 9 or 

 10 mm. long. The terminal combs usually end at about P 3 , but may extend as far 

 as P . The pinnules on the division series are somewhat carinate basally. The 

 pinnules on the arm bases as far as the fourth pair, more rarely for one or two more 

 pairs, have the first 2 segments strongly carinate. The distal ends of the pinnule 

 segments are armed with prominent spines, and their dorsal surface is covered with 

 small spines. 



The color in alcohol is dark reddish brown, the cirri yellow brown; yellow; 

 brownish white; light yellow brown; nearly white, the pinnules almost black in the 

 basal third, bright green in the distal two-thirds; or blackish brown. 



Notes. The specimen from North Male, Maldives, is a large and well-developed 

 individual. 



The examples from Investigator station 152 are medium sized and small, each 

 with about 65 arms. Those from Investigator station 175 are all small, as are two 

 from east of the Terribles. 



The specimens from Singapore agree with others from the Philippine Islands. 

 One has 57 arms 95 mm. long and the cirri XX, 30, from 25 to 30 mm. long. 



Another has 60 arms 100 mm. long and the cirri XVIII, 30, 30 mm. long. The 

 color of both of these is very light brown. 



A third has 60 arms 90 mm. long and the cirri XX, 30, 20 mm. long. After the 

 tenth the cirrus segments develop prominent distal edges dorsally which form sharply 

 serrate transverse ridges; these ridges gradually become shorter distally so that the 

 last 12 or 13 segments bear merely a pair of prominent tubercles. The opposing 

 spine is central, subcentral or terminal, erect or directed slightly outward, stout, and 



