A MONOGRAPH OF THE EXISTING CRINOIDS 87 



mm. across, was taken in Roebuck Bay. Dr. Clark says it has about 110 arms, but 

 it is impossible to count the exact number without serious damage to the specimen. 

 The cirri are XLIII, 52-70, from 50 to 55 mm. long; one of the cirri is forked at 



the tip. 



In the specimen from Mjoberg's station 13, as described by Gislen, the centro- 

 dorsal is flattened with the bare dorsal pole 3 mm. in diameter. The cirrus 

 sockets are arranged in three or four irregular rows. There are 42 cirrus sockets of 

 which 17 carry large cirri, 16 carry regenerating young cirri, and the rest are empty. 

 The cirri are XVII, 48-51, 40-50 mm. long. From the sixteenth to the twenty- 

 fourth segment onward there is a small distal dorsal tubercle or blunt spine. The 

 first segment is very short, about half as long as the second, and those following 

 increase in length to about the twelfth, which is somewhat longer than broad, and 

 then decrease in length. The blunt dorsal spines, which are directed obliquely for- 

 ward, are in height equal to about one-fifth the width of the segments that bear 

 them. The opposing spine is in length equal to about half the width of the pen- 

 ultimate segment, and is directly obliquely distaUy. The terminal claw is half again 

 as long as the penultimate segment, slightly curved, and white like the dorsal spines. 

 The radials are almost completely concealed, being visible only in the interradial 

 angles. The IBr! are very short, seven times as broad as long, and are in contact 

 basally. The IBr 2 (axillaries) are broadly pentagonal, about three times as broad 

 as long. The IIBr series are 4(3 + 4), except for a single one which is 2. Of the 18 

 IIIBr series present 1 1 are 4 (3 + 4 ) and 7 are 2 . The nine 1 VBr series are all 4 (3 + 4 ) . 

 The division series and first two brachials are laterally flattened with a fairly distinct 

 ventrolateral edge. The arms are between 49 and 60 in number and are about 130 

 mm. long. They are a little compressed laterally. On the undivided arms the 

 first syzygy is between brachials 3+4, the second is from brachials 30 + 31 to brachials 

 39 + 40, the third is from brachials 49 + 50 to brachials 56 + 57, and the fourth is from 

 brachials 61 + 62 to brachials 64 + 65. On one arm the syzygies are between brachials 

 3_j-4 ; 8 + 9, 26 + 27 and 39+40, and on another between brachials 3 + 4, 13 + 14, 30 + 31 

 and 49 + 50. But in general the animal shows fairly definite zones of syzygies crossing 

 all the arms. The anal tube is encrusted with coarse calcarous concretions. 



Pj is 20 mm. to 22 mm. long and is composed of 39-48 segments. The basal 

 segments are about as long as broad, and the distal are half again as long as broad. 

 P 2 is 20 mm. to 23 mm. long with 36-43 segments; as in P, the basal segments are a 

 little flattened. P 3 is 20 mm. long with 38 segments. P 4 is 13 mm. long with 26 

 segments. P 5 is 10 mm. long with 24 segments. P 10 is 8 mm. long with 15 segments. 

 The distal pinnules are 8 mm. long with about 20 segments. The color in fife, ac- 

 cording to a note by Dr. Mjoberg, was yellowish white both dorsally and ventrally, 

 the pinnules dark with small rectangular whitish spots. The proximal segments of 

 P, have lateral black spots. In alcohol the specimen is yellow-brown, the arms being 

 chocolate-brown ventrally. The segments of the distal pinnules have dark central 

 bands and white ends so that the pinnules as a whole suggest a string of beads. 



From Holothuria Bank I have seen one fine specimen and fragments of others. 



Bell mentioned three specimens from Nicol Bay, which he found in the British 

 Museum collection and which he said were smaller than the type specimen from 

 Port Molle. He noted that the smallest of these has not more than XXX cirri, which 



