A MONOGRAPH OF THE EXISTING CRINOIDS 281 



tions and depressions, rendering the surface of the arm as a whole somewhat uneven. 

 There then follows a row of somewhat wedge-shaped brachials, which soon pass over 

 into discoidal brachials. The brachials remain short to the arm tips. Because of the 

 produced distal ends of the brachials the dorsal profile of the arms is gently serrate. 

 Syzygies occur between brachials 3 + 4, again from between brachials 23+24 to 

 between brachials 27 + 28, and distally at intervals of from 8 to 10 muscular articu- 

 lations. P D , and P] on arms arising from a IBr axillary, is slender and about 11 mm. 

 long. Pi on other arms is almost as long but not quite so stout as P 2 , which reaches 

 20 mm. and is composed of about 30-35 segments. P 3 is markedly shorter, and the 

 length of the two following decreases. P a varies in size but is mostly as long as P D . 

 Sometimes it is almost as long as P b , which is always a good deal shorter than the long, 

 slender P 2 , which becomes very slender in its outer portion. The distal pinnules 

 reach 12 mm. in length. All the lower pinnules are remarkable for the somewhat 

 produced finely toothed distal edges of their segments. The disk is 15 mm. in 

 diameter and strongly incised. The disk bears conspicuous small conical lateral 

 papillae opposite the first forking of the ambulacral grooves. The anal tube is plated. 

 The color is deep blackish brown with a reddish cast. 



From Dr. Merton's station 10 Reichensperger recorded 18 specimens with 11-20 

 arms from 50 to 80 mm. long. The cirri are XV-XXIV, 35-38, up to 23 mm. in 

 length. From about the tenth onward the segments are provided with prominent 

 sharp dorsal spines. The radials and the IBri are easily visible. Synartbrial tubercles 

 are developed on the articulation between the elements of the IBr series. The IIBr 

 series are almost without exception 4(3 + 4); but in one 20-armed specimen there are 

 exceptionally two IIBr 2 series. There are no division series beyond the IIBr series. 

 The distal brachials are exceedingly short, sometimes almost triangular. Syzygies 

 occur between brachials 3 + 4, from between brachials 13 + 14 to between brachials 

 17+18, and distally at intervals of 11-15 muscular articulations. P 3 is the longest 

 pinnule and is composed of 11 or 12 segments, which are longer than broad and bear 

 rounded and mostly finely dentate processes on the distal edge. Similar processes are 

 borne by the pinnules of the fifth, sixth, and seventh brachials. The color is varie- 

 gated, broadly banded with light to dark violet and brick red; the cirri are mostly 

 dark violet. 



In another lot from Merton's station 10 there are eight specimens representing 

 two color varieties. Two specimens are grayish white with the cirri and ambulacral 

 grooves mostly dark violet. Six specimens are wholly brick-red. There are 12-18 

 arms which in the largest are 90 mm. long. All the IIBr series examined by Reich- 

 ensperger are 4(3 + 4). 



The third lot from Merton's station 10 consisted of three large specimens that 

 had been fixed in corrosive sublimate and had been red when alive; three red and 

 violet examples; and 10 calices from animals which in life were cross banded red brown 

 and white, the disk with triangular white patches situated singly between the ambul- 

 acral grooves. 



From Dr. Merton's station 13 there were four specimens of which one had the 

 arms 45 mm. long, and the smallest had 11 arms only 30 nun. long, the single IIBr 



208244 — 40 19 



