368 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



rounded dorsal process and is from half again to twice as broad as the second; and 

 the first segment of P2 has a prominent high dorsal process. 



Description.— The centrodorsal is discoidal, moderately thick, with the bare 

 polar area flat, 4 mm. in diameter. The cirrus sockets are arranged in a single 

 slightly irregular marginal row. 



The cirri are IX-XV, ,39-46, from 25 mm. to 30 nun. long, resembling those of 

 A'^. spinosissima but somewhat more slender, especially distally; there is no ventral 

 carination as in A^. acanthaster. The first segment is very short, and the following 

 gradually increase in length to the fifth, which is nearly or quite as long as broad; 

 those succeeding up to the twelfth are similar, from which point the segments grad- 

 ually decrease in length those -in the terminal third of the cirri being twice as broad 

 as long. After the fifth or sixth the distal edge of the segments on the dorsal side 

 becomes prominent this prominence gradually narrowing, becoming higher, and 

 moving anteriorly, while at the same time the dorsal surface of the segments becomes 

 strongly carinate so that the short distal segments possess prominent, though small 

 and broadly roimded dorsal spines scarcely reaching in height one-quarter the width 

 of the segments which bear them. In the longer proximal segments there is more or 

 less eversion of the ventral distal edge. The cirri are moderately stout basally, but 

 taper slightly, becoming rather slender distally. 



The disk, calyx, and arm bases resemble those of A^. multicolor. The division 

 series and first two brachials have a slight rounded median carination. 



The 1.5-20 arms are from 60 mm. to 70 mm. in length, and resemble those of 

 N. multicolor. The brachials have moderately produced distal borders. 



Pi is 7 mm. long, slender and weak, composed of 25 segments of which the first 

 is greatly enlarged. P2 is stiff and spinelike, 10 mm. long. P3 is similar, 12 mm. long. 

 P4 is similar, 1 mm. long. Ps is 9 mm. long. Pj is 8 mm. long. P? and the following 

 pinnules are 6 mm. long. The distal pinnules are 8 mm. long-. 



Notes.- — Of the specimens obtamed at Albatross station 5414, 2, both young, had 

 13 arms, 1 had 15, 2 had 16, 3 had 17, 1 had 18, 3 had 19, and 5 had 20; one of the 

 specimens was small and much mutilated. An example from Albatross station 5356 

 had 19 arms, and 2 from station 5413 had 17 and 18 arms respectively. 



The specimen from Siboga station 305 had apparently 20 arms, there being 12 

 on the 3 rays preserved, about 70 mm. long. The cirri are XVII; one cirrus not quite 

 of full size with 39 segments remains. 



Localities. — Siboga station 305; midchannel of Solor Strait, off Kampong 

 Menanga; 113 meters; stony bottom; February 8, 1899 [A. H. Clark, 1918] (1. 

 Amsterdam Mus.). 



Rotti Strait, between Rotti and southwestern Timor; 183 meters; cable repair 

 ship The Cable, Eastern and Associated Telegraph Co.; from the Banjuwangi-Dar- 

 win No. 2 cable [A. H. Clark, 1929] (3, B. M.). 



Albatross station 5356; North Balabac Strait; Balabac light bearing S. 64° 

 W., 15.5 miles distant (lat. 8° 06' 40" N., long. 117° 18' 45" E.); 106 meters; Janu- 

 ary 5, 1909 [A. H. Clark, 1911] (1, U.S.N.M. 35417). 



Albatross station 5355; North Balabac Strait; Balabac Ught bearing S. 61° 

 W., 16.6 miles distant (lat. 8° 08' 10" N., long. 117° 19' 15" E.); 80 meters; coral 

 and sand; January 5, 1909 (disk, U.S.N.M., 35991). 



