366 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



somewhat less strongly developed. The pinnules are somewhat shorter, with fewer 

 (14-18) segments. Reichensperger said that, except for the somewhat less robust 

 cirri, this specimen might have served for the figure given by Carpenter in the Challen- 

 ger report. 



In the smallest specimen the arms are 130 mm. long. The cirri are XVII, about 

 30. The synarthrial tubercles are less strongly developed than in that just preceding. 

 PI is about 8 mm. long, with 16-18 segments. P 2 is 1 1 mm. long, with 18-20 segments. 

 P 3 is equal to P 2 , or is slightly shorter. The bracm'als of this specimen are noticeable 

 for their marked shortness. 



All three specimens have some of the lower pinnules with a trace of carination, 

 usually only on the lowest segments. The color of the three specimens in alcohol 

 is blackish brown. 



The specimen collected at Amboina by the Danish Expedition to the Kei Islands 

 is large; the cirri have 36-39 segments. 



The specimen collected by the Willebrord Snellius at Amboina has 11 arms 220 

 mm. long. One IIBr 2 series is present. The cirri are 40 mm. long, with 43-47 

 segments. 



Miiller described Comatula jacquinoti as follows: There are 10 arms. The centro- 

 dorsal is moderately convex and appears to be entirely covered with cirri. The cirri 

 are XX, 35. Toward the end of the cirri, or much earlier, there is developed dorsally 

 on the segments a spine that certainly on the forward part of the segment is directed 

 distally. The cirrus segments are broader than long. The radials are very short. 

 The brachials are short. The intersyzygial interval is 4-7 muscular articulations. P, 

 to P 3 or P 4 are stouter than the other pinnules. The color is blackish brown. The 

 expanse approaches 2 feet (which would give an arm length of about 300 mm.). 

 Habitat Ceram. 



My notes on the type specimen, which I examined at the Paris Museum, are as 

 follows: The cirri are large and stout, becoming laterally compressed distally. The 

 first segment is very short, and those following progressively increase in length to the 

 eighth or ninth, which is half as long as broad. All the cirrus segments are approxi- 

 mately equal hi size. Rather prominent dorsal spines are developed from the twelfth 

 or thirteenth segments onward. There are 10 stout arms. The radials are concealed. 

 The IBr! are very short and are almost entirely united with their neighbors. The IBr 2 

 (axillaries) are almost triangular, twice as broad as long. They are not quite in lateral 

 contact. The synarthrial tubercles are only slightly developed. The brachials are 

 extremely short, with their distal ends slightly overlapping. The pinnules resemble 

 those of the A. milberti described by P. H. Carpenter (A. molleri). The color is 

 brownish black. 



In the two specimens from Siboga station 164 the arms and cirri are slightly 

 stouter than in the specimens from Siboga station 33, and the cirri are relatively 

 shorter, with a less-marked production of the distal ends of the segments. In one the 

 arms are about 140 mm. long, and the cirri are XVII, 34, 27 mm. long. The longest 

 cirrus segments are from half again to twice as broad as long. Dorsal spines are 

 developed from the tenth or eleventh segments onward, and the earlier spines are 

 double as described for the specimens from station 33. The color is violet, with the 

 cirri yellow, becoming violet distally in one specimen. 



