368 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



spines from the eighteenth; 29, with spines from the seventeenth; and 27 (a very young 

 regenerating cirrus) . The cirri of the second (apical) row have the following numbers 

 of segments: 26, with spines from the thirteenth; 27, with spines from the seventeenth; 

 27, with spines from the thirteenth; 27, with spines from the seventeenth; 28, with 

 spines from the eleventh; 28, with spines from the thirteenth; and 29 with spines from 

 the fourteenth. The 10 arms are 75 mm. long. The brachials are smooth, the proximal 

 ones a little rugged. The first four brachials are a little flattened laterally. The IB^ 

 are like the first brachials but are partly fused. PI is 5.5 mm. long, with 13 segments. 

 P 2 is 7 mm. long, with 13 or 14 segments. P 3 is of about the same length, with 13 

 segments. P 4 is up to 6 mm. long, with 12-14 segments. P a is 4.5 mm. long, with 11 

 segments. P b is 6.5 mm. long, with 12 segments. P c is 8 mm. long, with 13 segments. 

 The distal pinnules are 6.5 mm. long, with 16 or 17 segments. The segments of the 

 pinnules are short. The basal segments are never longer than broad, and are coarse 

 and thick; the distal segments are somewhat longer than broad and, especially in P c , 

 are slender and thin. 



The specimen from Mjoberg's station 9 was thus described by Gislen. The 

 centrodorsal is thick discoidal, with the bare dorsal pole 3 mm. in diameter. The 

 borders of the dorsal pole are somewhat swollen toward the cirrus bases. The cirri 

 are XXIII-XXIX, 26-38, from 20 to 28 mm. long, and are arranged in two rows on 

 the centrodorsal. The dorsal spines may begin anywhere from the ninth to the twenty- 

 first segment. The dorsal spines are short, in height never reaching more than one- 

 third the width of the segments, and arise from the distal portion of the segments. 

 The opposing spine is twice as large as the preceding dorsal spines, is erect, and arises 

 from almost the whole of the dorsal surface of the penultimate segment. The terminal 

 claw is half again as long as the penultimate segment, usually rather slender with a 

 very long point, and is strongly curved. The radials are smooth and very short, 

 longest in the interradial angles. The IBr, are laterally united. The elements of the 

 IBr series bear a synarthrial tubercle, as in Heterometra crenulata, but arising more 

 abruptly than in that species. The 10 arms are 140 mm. long and are basally closely 

 appressed, though not at all or only very slightly flattened laterally. The first 

 brachials are interiorly united, and there is a synarthrial tubercle on the articulation 

 between the first two brachials. The brachials to about the tenth are irregularly 

 discoidal with dorsolateral swellings, after the tenth becoming triangular. The arms 

 are smooth until about the fiftieth or sixtieth brachial, after which the distal portion 

 of the brachials becomes somewhat produced. The syzygies on two postradial 

 series are as follows: on one arm between brachials 3+4, 10 + 11, 18 + 19, 25 + 26, 

 34 + 35, 43+44, and 55 + 56, and on the other arm between brachials 3+4, 11 + 12, 

 18+19, 29 + 30, 42+43, and 57 + 58; on one arm between brachials 3+4, 9 + 10, 

 21+22, 32 + 33, and 49 + 50, and on the other arm between brachials 3+4, 9 + 10, 

 16 + 17, 29 + 30, 37 + 38, and 50+51. 



PI is 5.5-8 mm. long, with 13 (station 8) to 16 (station 11) segments, which are 

 smooth and, except for the distalmost, a little longer than broad. The nine proximal 

 segments are triangular in cross section. The outermost segments have the distal 

 borders somewhat produced. Similar conditions are seen in P 2 and P 3 also. P 2 is 

 7-10.5 mm. long, with 13 (station 8) to 19 (station 11) segments, of which the first 

 is short and squarish and the third and fourth are the longest; the second-sixth seg- 



