352 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



One of the two specimens from Singapore recorded in 1909 resembles the type; 

 it is flesh colored, with the perisome brownish. The other is smaller; it is flesh colored, 

 with the perisome of the arms and the bases of the pinnules deep violet exactly as in a 

 specimen of A. discoidea at hand from the Philippines. Other specimens from Singa- 

 pore collected by Svend Gad show the following characters. (1) The arms are 115 

 mm. long. The cirri are 23 mm. long with 33-35 segments; dorsal spines are developed 

 from the eleventh or twelfth segment onward. (2) The arms are 95 mm. long. The 

 cirri are about 17 mm. long with 24-27 segments; dorsal spines are developed from the 

 seventh-twelfth segment onward. (3) The arms are 100 mm. long. (4) The arms are 

 80 mm. long. (5) The arms are 75 mm. long. 



One of the specimens from off Cape Jabung has 11 arms, one IIBr 2 series being 

 present. 



One of the specimens from near Deli also has one IIBr 2 series and 11 arms. 



The specimen from the Danish Expedition to the Kei Islands station 101 has the 

 arms 105 mm. long, and the cirri X (with some additional more or less developed ones), 

 27-30, 20 mm. long. The dorsal pole of the centrodorsal is evenly convex. This is a 

 small specimen with the cirrus segments rather longer than in typical examples, but 

 it seems to belong here. The color is deep purple with the cirri light yellowish. 



The specimen from the Danish Expedition to the Kei Islands station 82 has 30-35 

 cirrus segments. 



The specimen from the Danish Expedition to the Kei Islands station 103 is small 

 with the arms 60 mm. long. Dorsal processes are found on the second or third and 

 following cirrus segments. 



The largest specimen from Koh Kram has the arms about 80 mm. long. 



Miss Lee Boone says of the specimens collected by Mr. Vanderbilt at the Anambas 

 Islands that one is young, another approximately the dimensions of the type (of A. 

 ensifer), and the third not quite so large. All three are figured. She says that the 

 centrodorsals are thick and discoidal, with the cirrus sockets close together in two 

 irregular semialternate series. The cirri are XVIII-XX, 30 (except those broken or 

 undergoing regeneration), 20 to 21 mm. long. "These joints have the proportions 

 described in the type [of A. ensifer] and are similarly tuberculate in the dorsal line from 

 the tenth to distal articles, except on three cirri, where the tubercles begin, respec- 

 tively, on the sixth, eighth and ninth articles. These dorsal spines or tubercles are 

 uniformly strong, conical, the proximal ten to twelve being moderately developed, 

 the distal ten being distinctly higher, except when the distal one is yet longer, about 

 subequal; the opposed terminal claw strong, about as long as the diameter of the pre- 

 ceding segment, basally thick and decidedly curved, but nearly straight distally and 

 acuminate." The 10 arms, according to Miss Boone, are about 80 to 85 mm. long, 

 and are unbroken in the largest specimen. None is entire in the second specimen, 

 but the three arms, almost complete, have an average length of 60 mm. each. The 

 XX cirri are each 18-20 mm. long. The disk has a mosaic pavement consisting of 

 small plates. This specimen also has 10 arms. The third specimen, juvenile, has 10 

 arms of an average length of 30 mm. (with tips broken off), and has the cirri XV, 20-26, 

 the longest about 11 mm. long, "the tubercle spines beginning from the eighth joint 

 distad, these spines being relatively longer and more acuminate in the young crinoid; 

 the subdistal spine in each instance being 1.5 to twice as high as those preceding, 



