A MONOGRAPH OF THE EXISTING CRINOIDS 173 



lower brachials have on each side, as far as the lowest pinnule, a slightly produced 

 ventrolateral edge, corresponding with that on the IBr series. Viewed in profile the 

 brachials have a somewhat concave dorsal surface and very prominent distal ends 

 which are strongly overlapping and give the animal a curiously ornate appearance. 

 Syzygies occur between the third and fourth brachials (the fifth and sixth post- 

 radial ossicles), again between the eighth and ninth, and distally at intervals of three, 

 more rarely four, muscular articulations. 



P c is 5.5 mm. long, moderately stout basally, tapering evenly to the tip, rather 

 strongly prismatic, with 12 segments, of which the first is short, the second is not quite 

 so long as broad, the third and fourth are squarish, and the following gradually increase 

 in length, becoming nearly or quite twice as long as broad terminally. P, is similar to 

 Pc, with the same number of segments, but somewhat stouter and not tapering so 

 rapidly. P ft is 8.5 mm. long, much stouter than P c , gradually tapering from the base 

 to the tip, with 12 or 15 segments, of which the first three are about as long as broad 

 and these following very gradually become elongated and about twice as long as broad 

 distally; the pinnule is rounded prismatic. P 2 is similar to P a . P b is 6 mm. long, 

 slender, cylindrical, less stout basally than P , gradually tapering and becoming very 

 delicate in the terminal portion, with 15 or 16 segments, of which the first is short, the 

 second and third are about as long as bn ad, and the following gradually increase in 

 length, becoming nearly or quite three times as long as broad in the terminal portion. 

 P 3 is similar to P b . The following pinnules are similar, gradually decreasing in length 

 to 5 mm., then very slowly increasing, reaching a length of 10 nun. distally. The distal 

 ends of the segments of the lower pinnules are more or less produced and spinous. 



The disk bears a few rather large plates along the ambulacra and is well plated in 

 the anal area. 



Notes. — The preceding description is based upon specimens from Investigator 

 station 61. 



In the specimen from Investigator station 387, P tt reaches 12 mm. in length and is 

 composed of 18 segments, of which the distal are three to four times as long as broad. 

 The single specimen collected by the Investigator and labeled Andaman Islands 

 with no further data was described as the type specimen of a new species, Eudiocrinus 

 minor. In this specimen the centrodorsal is a thin disk, with the bare flat dorsal pole 

 1 mm. in diameter. The cirrus sockets are arranged in a single marginal row. The 

 cirri are XII, 12, 5 mm. long. The first two segments are twice as broad as long, 

 the third is half again as broad as long, and the fourth is twice as long as broad. The 

 following segments very gradually decrease in length, the antepenultimate being about 

 one-third again as long as broad. The third and fourth segments are strongly con- 

 stricted centrally, the fifth and sixth are slightly constricted, but the following have 

 practically straight profiles. The cirri are proximally almost circular in cross section, 

 after the fifth segment becoming laterally compressed and therefore broader in lateral 

 view. There are no dorsal spines or projections. The opposing spine is median, 

 small, scarcely equaling one-fourth the width of the penultimate segment in height. 

 The arms and pinnules resemble those of E. indivisus, the overlapping of the brachials 

 and pinnule segments being moderately marked. The arms are 15 mm. long. The 

 color in alcohol is white. 



