248 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The radials are almost entirely concealed in the midradial line, but extend up- 

 ward in the interradial angles of the calyx. The IBr, are about four times as broad 

 as long, in contact basally or free, and bear a small mediodorsal tubercle. The IBra 

 (axillaries) are one-tbu-d again as broad as long, almost hexagonal, with a low longi- 

 tudinal synarthrial crest rather slightly bordered in the proximal two-thirds. 



The 10 arms are from 30 to 35 mm. long. They are smooth with rather long 

 proximal brachials. The first brachials are interiorly united for two-thirds of their 

 length. The second brachials are twice as long exteriorly as interiorly. The first and 

 second brachials have a slight synarthrial prominence similar to that on the IBr series. 



Syzygies occur between brachials 3+4 and 9 + 10 and distally at intervals of 3 

 muscular articulations. 



Pi and Pa are absent. Pj is 6.5 mm. long with 12 segments of which the first is 

 short, the second is a little longer than broad, the third is twice as long as broad, and 

 the fourth and fiftli are from 3 to 4 times as long as broad, slender, with the ends some- 

 what expanded. From the third segment onward the distal ends are indistinctly 

 collar-shaped and have spiny borders. Pb is 6 mm. long. P3 is 5 mm. long with 11 

 segments. P4 is 3.2 mm. long with considerably shorter segments and a gonad. The 

 distal pinnules are 5.5 mm. long with 16 segments of which the first and second, and 

 the terminal, segments are short and the othei-s are twice as long as broad. 



The disk measures 4 mm. in its greatest and 2.5 mm. in its least diameter. It is 

 incised, and is without calcareous granules. The anal tube is long, about 2 mm. high. 



The arms are red-violet and the cirri are white. 



Notes. — In a second specimen from station 43, as described by Gisl^n, the cirri 

 are XXVIII, 16-19, from 3.5 to 5.5 mm. long. The 10 arms are 25 mm. long. P2 is 

 5.5 mm. long with 12 segments. P3 is 4.7 mm. long with 10 segments. P4 is 3 mm. 

 long with 10 segments. The distal pinnules are 5 mm. long with 15-17 segments. 

 The disk is of the same size as in the specimen preceding. The anal cone is 1.5 mm. 

 high. The color is a little hghter than in the preceding specimen, red gray with a 

 light dorsal longitudinal band. 



In the third specimen from station 43 the cirri have 14 or 15 segments. The 

 radials are visible as narrow bands. The IBri are laterally free. The synarthrial 

 tubercles are indistinct. The 10 arms are 20 mm. long. P2 is 4 mm. long with 9 

 segments. Pb is 3 mm. long with 9 segments. P3 is 3.5 mm. long with 8 segments. 

 P4 is 2.3 mm. long with 7 segments. The distal pinnules are 4 mm. long with 12 

 segments. 



In the fourth specimen from station 43 the cirri are XV, 13, from 3 to 3.5 mm. 

 long. The radials are easily visible, 6 times as broad as long. There are no synar- 

 thrial tubercles. The arms are broken off. 



In a fifth specimen from station 43 the cirri are XVII, 13. The radials are as 

 in the specimen preceding. The 10 arms are 12 mm. long. P2 is 2.7 mm. long with 

 8 or 9 segments. Pb is 2.7 mm. long with 7 segments. P3 is 2.5 mm. long with 7 or 8 

 segments. P4 is 1.5 mm. long with 8 segments. The distal pirmules are 2.5 mm. 

 long with 10 segments. 



In a sixth specimen from station 43 the cirri are XXVIII, 13-16, from 3.5 to 6 

 mm. long. The 10 arms are 27 mm. long. P2 is 4.2 mm. long with 9 segments. 



