A MONOGRAPH OF THE EXISTING CRINOIDS 115 



The specimen from Holothuria Bank has 18 arms, and the cirri are X, 29-31, 

 20 mm. long. On the cirri long dorsal spines are developed from the eleventh seg- 

 ment onward. 



Dr. H. L. Clark says that the number of arms in specimens from Broome ranges 

 from 11 in a specimen 70 mm. across to 25 in a specimen 115 mm. from tip to tip. 

 Of the 39 specimens he collected and examined the largest are 175-200 mm. across 

 and have 16-24 arms. He remarks that it is hard to see where the line is to be drawn 

 between this species and punctata. So far as the number of segments in the cirri is 

 concerned, the series of specimens from Broome shows that there is a considerable 

 range of variation, but only a few large specimens show as many as 25-27; most of 

 them have 20-23. None of the specimens from Broome have fewer than 20 cirrus 

 segments. 



The example from Siboga, station 179 has 20 arms 90 mm. long. There are six 

 IIBr 4 (3 + 4) series and four IIIBr 2 series present, the latter all internal. The 

 distal borders of the radials are obscurely beaded. The sides of the division series 

 and rays bear a few irregular spinous processes. The cirri are XVIII, 28-33 (usually 

 30), 25 mm. long. Long dorsal spines are developed from the eleventh to the thir- 

 teenth segment onward. 



The specimen collected by Dr. Th. Mortensen off Jolo has 41 arms about 100 mm. 

 long. Of the 10 IIBr series five are 4 (3+4), three are 2, and two are 3. Of the 16 

 IIIBr series eight are 2 and eight are 4 (3 + 4). The centrodorsal is discoidal, broad, 

 with a broad flat circular dorsal pole 6 mm. in diameter. The cirri are XXXII, 

 36-45, 30 mm. long. 



The specimen from Albatross station 5358 has 28 arms 110 mm. long. It resem- 

 bles others from Singapore with which it was compared. 



Of the five specimens from Bantayan Reef four have about 40 arms, and the fifth 

 has about 20 arms. 



Carpenter noted (1888) that, while in the specimens from the Mergui Archi- 

 pelago the ambulacra of the disk are very strongly plated, and also the interpalmar 

 areas at their sides, this feature is less marked in Philippine examples. He also 

 remarked (1889) that the straight-edged and "wall-sided" character of the elements 

 of the IIBr series, a tendency to wlrich is shown by the largest specimens from Mergui, 

 is much more distinct in the specimens from the Philippines. 



The specimen from Pulo Condor, as described by Gislen, has 20 arms; of the 10 

 IIBr series six are 2 and four are 4 (3 + 4). The cirri are XXII, 25-26. The color is 

 mottled violet and white. 



In the better of the two specimens from Hongkong there are about 38 arms, 

 which are about 90 mm. long. There are nine IIBr series, five of which are 4 (3+4), 

 the other four being 2. Of the 15 IIIBr series, 11 are 4 (3+4) and four are 2. The 

 single IVBr series is 4 (3+4). The radials, division series, and arms are similar to 

 those of specimens from Singapore. The centrodorsal is discoidal, very slightly 

 concave — almost flat — on the broad dorsal pole, which is 5 mm. in diameter. The 

 cirri are arranged in two irregidar closely crowded marginal rows, and are XXIX, 

 34-36, from 20 to 27 mm. long. The longest proximal cirrus segments are usually 

 from one-third to one-half again as broad as long, and the outer cirrus segments are 

 two and one-half or three times as broad as long. The eighth or ninth and following 



