A MONOGRAPH OF THE EXISTING CRINOIDS 399 



About eight or nine of the following brachials are oblong, and those succeeding are 

 shorter and rather sharply wedge-shaped. Toward the ends of the arms the brachials 

 become more bluntly wedge-shaped, and finally more squarish. 



Syzygies occur between brachials 3+4, again somewhere between the forty-first 

 and fifty-first brachials, and distally at intervals of usually nine or ten, but occa- 

 sionally only four, muscular articulations. 



The disk is surrounded by a thick circlet of spiny pinnules. The pinnules of the 

 first four pairs are very stiff and sharply spiny. Those of the first and second pairs 

 are about 14 mm. long and are composed of about 25 short segments. The pinnules 

 of the third and fourth pairs decrease in length. P 6 on the outer arms is also stiff- 

 ened and is about 5 mm. long. P 8 and P 7 are very small. The following pinnules 

 gradually increase in length, distally reaching about 8 mm. The spiny pinnules are 

 equally stout on all the arms, and the pinnules on the inner side of the arms are as 

 long as those on the outer. The segments of the enlarged lower pinnules are all 

 short, about as long as broad, and of uniform size. These pinnules are stiffened, 

 though scarcely so much so as those of the species of Stephanometra, and the tip, 

 though sharp, ends in the normal manner. The pinnules are more slender than the 

 enlarged and spiny pinnules of Stephanometra and are evenly tapering. 



The disk of the type specimen has been lost. Sacculi are thickly set on the 

 pinnules. 



The color in alcohol is uniform light brown. 



Notes. — The preceding description is adapted from Hartlaub's original descrip- 

 tion, with supplementary information supplied by my examination of the type speci- 

 men at Hamburg in 1910. 



The specimen from the Danish expedition to the Kei Islands station 20 has 35 

 arms 110 mm. long. 



One of the specimens from the Danish expedition to the Kei Islands station 90 

 has 41 arms 95 mm. long. A single IVBr series is present, on the outer side of one of 

 the inner IIIBr series — that is, next to the midradial line. The cirri are XXXVI, 

 54-63, from 40 to 50 mm. long. The longest cirrus segments are one- third again 

 as long as broad, and the short distal segments are from half again to twice as long 

 as broad. Pi is much stiffened, 9 mm. long with 20 segments of which the first is 

 very short, the fourth is nearly as long as broad, and the tenth and following are 

 twice as long as broad. The distal side of the segments (toward the arm tip) is slightly 

 concave. P 2 is cylindrical, 10 mm. long, with 19 segments; it is about as stout basally 

 as P, but tapers more gradually and is less slender distally. P 3 is 6 mm. long with 13 

 segments, of which the last three or four are about three times as long as broad. P 4 is 

 5.5 mm. long, with 12 segments. 



Another specimen has 49 arms 105 mm. long; the extra axillary is next to the mid- 

 radial line. The cirri have 50-52 segments and are up to 40 mm. in length. Pi is 

 11.5 mm. long, with 22 segments. P 2 is 12 mm. long, with 22 segments, more stiffened 

 than Pi, tapering very slowly and therefore stouter in the distal half. P 3 is 9 mm. long, 

 with 17 segments, and resembles P 2 . P 4 is 6.5 mm. long, with 14 segments, and resem- 

 bles P 3 . 



