A MONOGRAPH OF THE EXISTING CRINOIDS 267 



The two specimens from Siboga station 274 are small. The larger has 13 arms 

 75 mm. long. There are three IIBr 4(3 + 4) series on three separate postradial series. 

 The animal is flesh colored with regular narrow purple bands on the arms. 



The specimen collected by Dr. Merton in the Aru Islands was thus described 

 by Reichensperger: The centrodorsal is somewhat hemispherical, convex, the free 

 dorsal pole about 3 mm. in diameter and sculptured with fine pits. The cirri are 

 arranged in two or three irregular rows. The cirri are XXXIII, 40-42, about 35 

 mm. in length. None of the cirrus segments are longer than broad; the middle ones 

 are about as long as broad and they bear toward the end a prominent dorsal keel. 

 The antepenultimate segment is toothed. The terminal claw is short and not very 

 stout, but sharp. When viewed from above the cirri are seen to be somewhat less 

 sharply pointed than those of Craspedometra acuticirra, although they have hi general 

 great similarity to the cirri of that species. The radials are visible for the most 

 part oidy in the interradial angles of the calyx where their adjoining anterolateral 

 corners are to be seen. The IBr, are very broad and short, about five times as broad 

 as long. The IBr 2 (axillaries) are shortly pentagonal. The IIBr series are always 4 

 (3+4); they are composed of short rugose elements which appear as if laterally 

 compressed at the articulations. This lateral compression is continued to the eighth 

 or tenth segment of the free undivided arms. When present the IIIBr series are 2; 

 the first segment is short discoidal, evenly convex dorsally, and the axillary is half 

 again as long and pentagonal. There are no further division series. The first ele- 

 ments of each division series are laterally united. There are 22 arms which are up 

 to 130 mm. long. The arms gradually taper distally. The 9 or 10 lowest brachials 

 are discoidal, short, and laterally compressed; those following become more and 

 more wedge-shaped and distally markedly convex dorsally, with the distal ends 

 laterally and dorsally produced so that the middle portion of the arm is very uneven. 

 The distal brachials are much more even and are short and discoidal. The first 

 syzygy is between brachials 3+4, and the second is somewhere between brachials 

 12+13 and brachials 15+16. 



P D is short, 10-12 mm. long, and is composed of 25-28 segments, which at first 

 are broader than long, in the middle of the pinnule about as long as broad, and later 

 broader again. The pinnule is but little stiffened and becomes slender and some- 

 what moniliform distally. Pi is longer than P D , of similar form but stiffer, 16-17 

 mm. long; the component segments are relatively markedly longer than those of 

 P D . P 2 is stiff, 19-20 mm. long, with 24-26 segments. It tapers gradually and the 

 distal portion is recurved and finally pointed. The three basal segments are broader 

 than long, the fourth is about as long as broad, and those following, if the pinnule 

 is viewed laterally, are longer than broad. P 3 is similar to P 2 but markedly stouter 

 and prominently keeled. It is up to 23 mm. long and is composed of 26-28 seg- 

 ments. P D to P 6 are basally, and Pi to P 3 are also farther out, prominently carinate. 

 The latter have on the outer side of the segments from the third onward lateral 

 processes involving the distal half of the segments which increase in size distally. 

 P 4 and a number of the succeeding pinnules are straight, rather stiff, of approxi- 

 mately the same length, 11 mm., and composed of 16-18 segments which except for 

 three or four of the basal are longer than broad. On individual arms P 5 may be the 

 smallest pinnule, only from 9 to 10.5 mm. long. From this point the size very slightly 



