416 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Diagnostic features.- The outer cirrus segments are wholly without dorsal 

 processes, being merely more or less sharply carinate in the middorsal line; PI is stiffened 

 and spinelike, resembling P 2 though smaller and slenderer; there are 12-32 arms 

 35-150 mm. long; and the cirri have 15-23 segments. 



Description. The centrodorsal is convex, with the bare dorsal pole small and 

 pitted ; the cirri are arranged in two irregular marginal rows. 



The cirri are XV-XX, about 15, slender and moderately compressed, with 

 smooth segments, of which the fourth-ninth are elongated. 



The radials are visible. The IBri, which are as long as the free sides of the 

 axillaries, are not in lateral contact. The IBr 2 (axillaries) are pentagonal. Four of 

 the postradial series divide only once, but the fifth which is markedly smaller than 

 the others, perhaps as a result of regeneration divides twice. The IIBr series are 

 2. The ventral edges of the division series are smooth, and synarthrial tubercles are 

 not developed. 



There are 12 smooth arms 35 mm. long. The first brachial is rather short and is 

 only partially united with its fellow. The second brachial is a little longer. The 

 first syzygial pair (composed of brachials 3+4) is longer than broad. From the 

 seventh onward the brachials are larger and wedge-shaped, finally becoming more 

 oblong. 



The first syzygy is between brachials 3+4, the second is between brachials 9 + 10, 

 and the distal intersyzygial interval is three or four muscular articulations. 



P! on arms arising from a IBr axillary is slender, but rather stiff and styliform, 

 and consists of about 12, or at the most 14, elongated segments. P 2 is markedly 

 stouter and a good deal longer; it is quite stiff and spinelike, 6 mm. long, and consists 

 of 8-10 very long segments. P 3 and P 4 decrease in length and are less stiff. P a is 

 markedly smaller than PI and is not styliform. P b is about as long as P 2 . The 

 outer pinnules are moderately long, reaching 7 mm. in length. 



The disk is 7 mm. in diameter and is not incised. On the pinnules the sacculi 

 are large and closely set. 



The color in alcohol is light yellowish brown, with dark cross bands at the articu- 

 lations. The disk is gray-brown. 



Notes. The preceding description is taken from Hartlaub's redescription of the 

 type specimen from Amboina. 



The specimen from Siboga station 81 has 31 arms about 90 mm. long. The 

 cirri are XXIV, 22-23, 20 mm. long. PI is 10 mm. long, with 18 segments. P 2 is 12 

 mm. long, with 12 segments. P 3 is 10 mm. long, with 11 segments. P 4 , which is of 

 the same character as the pinnules preceding, is 8 mm. long, with 10 segments. 



The example from Siboga station 89 has 25 arms about 80 mm. long. The cirri 

 are XXIII, 22-23, from 15 to 20 mm. long. PI is 11 mm. long, with 20 segments, of 

 which the first two are about as long as broad, the third is longer than broad, and the 

 remainder are much elongated; the pinnule is slender but very stiff. P 2 is 11 to 12 

 mm. long, stouter than P b with 13 segments. P 3 is 9 mm. long, with 10 segments. 

 P 4 , which resembles the preceding pinnules, is 5 mm. long, with 9 segments. 



One of the specimens collected by the Danish Expedition to the Kei Islands at 

 Vatek van Toeal has the cirri XXI, 23, from 20 to 23 mm. long. The first segment 



