450 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



to half that of the penultimate segment. The terminal claw is about as long as the 

 penultimate segment. The basals form a narrow continuous ring, especially pro- 

 jecting at the interradial angles. The raclials are half again as broad as long with 

 a strong longitudinal crest in the proximal two-thirds. They are laterally contiguous 

 and enclose practically the whole intestinal sac. The IB^ have a mediodorsal 

 crest like the IBr 2 (axillaries) and are well separated from each other laterally. The 

 10 arms are 7 mm. long with only 13-18 brachials. On the two arms of a single 

 postradial series syzygies occur between brachials 3+4 and 10+11. The disk is 

 concealed. PI to P 3 are usually absent. Sometimes, however, P! and P 3 are de- 

 veloped. The distal pinnules are 3 mm. long with 14 segments. Because of the 

 relatively great size of the pinnules the brachials, especially the eighth and eleventh, 

 appear almost like axillaries. 



In another young specimen from station 53 the cirri are XIV, 20-35, 7-10 mm. 

 long. The 10 arms are 15 mm. long. The distal pinnules are 5.5 mm. long with 15 

 segments which are three times as long as broad. Kudimentary orals are present. 



Another young specimen from station 53 has the cirri XI, 25-35, 8-13 mm. long. 

 The 10 arms are 15 mm. long. The distal pinnules are 5.5 mm. long with 15 segments 

 which are two and one-half times as long as broad. 



The last specimen from station 53 has the cirri XIII, 17-31, 3-11 mm. long. 

 The 10 arms are 15 mm. long. The distal pinnules are 5 mm. long with 15 segments 

 which are two and one-half times as long as broad. 



In a specimen from Bock's station 54 the cirri are XVI, (14)-27, (3)-7 mm. 

 long. The fourth cirrus segment is the longest, three times as long as broad. Dorsal 

 spines are developed from the sixth (to tenth) segment onward. The radials are half 

 again as long as broad with a well circumscribed median tubercle. The elements of 

 the IBr series are similar, but with a median keel, the IBr, being half again as broad 

 as long and the IBr 2 (axillaries) as long as broad. The IBr t and the first brachials 

 have a slight lateral carination. The 10 arms are 8 mm. long. There is a median 

 keel on the first two brachials, less developed than that on the IBr series. P, is 2.2 

 mm. long with 9 segments. P 2 is lacking. Small orals are present. 



In another specimen from station 54 the cirri are XV, 10-16 mm. long. The 

 radials are as long as broad. The elements of the IBr series have a rather distinct 

 median crest. The 10 arms are 25 mm. long. The distal pinnules are 6.5 mm. long; 

 their segments are twice as long as broad. 



In a specimen from Bock's station 55 the cirri are XI, 16-22, 4-5 mm. long; the 

 third-sixth segments are the longest, two and one-half times as long as broad, and the 

 distal segments are half again as long as broad. There is a dorsal carination from 

 the ninth segment onward. The opposing spine rises to a height equal to half the 

 width of the penultimate segment. The basals form a narrow continuous ring 

 especially projecting in the interradial angles. The radials are twice as broad as long 

 with a high keel, interradially somewhat produced anteriorly, extending distally 

 between the IBr,. The 10 arms are 7 mm. long. The outermost brachials have a 

 small dorsal spine. The brachials bearing pinnules usually are shaped like axillaries. 

 The lowest pinnule is most often on the seventh brachial. There is sometimes also a 

 small PI. One axillary bears on the left a long arm, 5 mm. long, provided with a 

 small P, and distal pinnules, and on the right a smaller arm, 2 mm. long, without 



