452 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



brachials 3 + 4, 7+8, 9 + 10, 13 + 14, 20 + 21, 27 + 28, 33 + 34, 39+40. The distal 

 intersyzygial interval is 4-7 muscular articulations. PI is 6 mm. long with 13 seg- 

 ments. P 2 is 7 mm. long with 13 segments. P 3 is 6.5 mm. long with 13 segments. 

 The distal pinnules are 11 mm. long with 17-19 segments. 



In another specimen from station 56 the centrodorsal has no dorsal depression. 

 The cirri are XX, 71-86, 40-56 mm. long. There is a dorsal crest on most of the seg- 

 ments from the fourth or fifth onward. There is no gap between this crest and the 

 dorsal spines, which begin on about the fifteenth segment. The 11 arms are 80 mm. 

 long; they are laterally flattened as far as the fourth brachial. The brachials develop 

 a dorsal spine from about the sixtieth; the terminal eight have only rudimentary 

 pinnules. The distal intersyzygial interval is 4-6 muscular articulations. PI is 5.5 

 mm. long with 12 segments. P 2 is 5.5 mm. long with 9 segments. P 3 is 6 mm. long 

 with 9 segments. The distal pinnules are 11.5 mm. long with 18-19 segments. 



In another specimen from station 56 the centrodorsal is lower than in that pre- 

 ceding, not conical at the apex, 2.5 mm. broad at the base and 1.5 mm. high. There 

 is no dorsal depression. The cirri are XVI, 69-76, 40-55 mm. long. The third-fifth 

 segments have a dorsal spine, those following a crest, becoming smooth on about the 

 fifteenth, then gradually developing dorsal spines distally. The radials have a slight 

 median tubercle. The 10 arms are 70 mm. long. Dorsal spines are developed from 

 the fortieth brachial onward. The distal intersyzygial interval is 6-11 muscular 

 articulations. PI is 4 mm. long with 8 segments. P 2 is 5 mm. long with 10 segments. 

 P 3 is 5 mm. long with 10 segments. The distal pinnules are 10 mm. long with 16 

 segments. 



Another specimen from station 56 has the centrodorsal as in the preceding. The 

 cirri are XVI, 59-82, 26-54 mm. long. The radials have a very high and well-marked 

 tubercle. The IB^ have a trace of a crest. The 10 arms are 80 mm. long. The 

 brachials from about the twentieth onward have dorsal spines. The terminal 7 have 

 only rudimentary pinnules. The distal intersyzygial interval is 6-8 muscular articu- 

 lations. PI is 5 mm. long. P 2 is 5.5 mm. long. P 3 is 5 mm. long. The distal 

 pinnules are 10 mm. long with 19 segments. 



In another specimen from station 56 the cirri are XVI, 57-68, 35-48 mm. long. 

 The third-fifth segments have a small dorsal spine, and the sixth-tenth (or fifteenth) 

 are smooth. The radials carry a very small tubercle. The 12 arms are 55 mm. long. 

 The brachials develop dorsal spines from the fortieth onward. The distal intersyzygial 

 interval is 6-9 muscular articulations. Pj is 4.5 mm. long with 9 segments. P 2 is 5.5 

 mm. long with 9 segments. P 3 is 6 mm. long with 7 segments. The distal pinnules 

 are 8 mm. long with 15 segments. 



In a rather small specimen from station 56 the cirri are XIII, 39-62, 14-29 mm. 

 long. The cirrus segments are longer than those of the preceding specimen. The 

 second-sixth segments have both a ventral and a dorsal crest, and the seventh-tenth 

 (or twelfth) are smooth. The radials have a high median prominence. The elements 

 of the IBr series are almost smooth. The 10 arms are 35 mm. long. The brachials 

 develop a dorsal spine from the thirty-fifth onward. The terminal two to four 

 brachials have rudimentary pinnules. On one arm syzygies occur between brachials 

 3+4, 14 + 15, 22 + 23, and 31+32. P, is 3.5 mm. long with 9 segments. P 2 is 4 



