320 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



(composed of brachials 3 + 4) are about twice as long inwardly as outwardly, and nearly 

 twice as broad as long. The following five or six brachials are obliquely wedge-shaped, 

 about twice as broad as long, with strong articular tubercles, giving the arm bases a 

 very rugged appearance. Beyond the second syzygy the articular tubercles disappear, 

 and beyond the third the brachials are triangular, about twice as broad as the median 

 length, with prominent and finely serrate distal edges which become more and more 

 marked distally. 



Syzygies occur between brachials 3+4, 9 + 10, 14 + 15, and distally at intervals of 

 3 muscular articulations. 



P! is 31 mm. long, composed of 63 segments, slender, and tapering gradually to a 

 delicate and flagellate tip. The first segment is almost oblong, nearly twice as broad 

 as long, with a slight angle in the middle of the distal border. The second is shorter, 

 with the anterolateral angles broadly cut away so that the proximal edges make nearly 

 a right angle with each other, with the ventral border rounded and the distal short and 

 straight; the dorsal portions of the proximal and distal borders are armed with fine 

 spines. The following segments decrease gradually in width and in the amount of the 

 truncation of the anterolateral angles so that after about the eighth the segments in 

 lateral view are almost square. The terminal twenty-five segments have the dorsal 

 side produced into a rounded angle crowned with fine spines which on superficial exam- 

 ination to a certain extent simulate the teeth of the combs of the Comasteridae. 



P 2 is 32 or 33 mm. long with 65 segments, resembling P! but not tapering quite so 

 rapidly and hence less flagellate distally. 



P 3 is 33 mm. long with 55 segments, resembling P 2 but with the segments beyond 

 the proximal eight half again as long as broad instead of as long as broad. 



P 4 is 34 mm. long with 44 segments, resembling P 3 but with the segments more 

 elongated and the distal without the production of the dorsal border. 



P 5 is 30 mm. long with 35 segments most of which are twice as long as broad. 



P 6 is 28 mm. long with 32 segments which become three times as long as broad in 

 the distal third and have the distal edge armed with very fine spines. 



P 7 is 25 mm. long with 28 segments which have the distal ends slightly more 

 prominent. 



The following pinnules are similar, slowly decreasing in length so that the twenty- 

 fifth is 23 mm. long with 32 segments which have the distal edges slightly everted and 

 finely spinous. 



The distal pinnules are 24 mm. long with 30 segments most of which are about twice 

 as long as broad, becoming more elongate distally, with finely spinous distal ends. 



Notes. The preceding description is based upon an unusually fine specimen from 

 Albatross station 3330, north of Unalaska in 642 meters. 



In the type specimen of asperrima, which is from Albatross station 3332, north of 

 Unalaska in 742 meters, the centrodorsal is hemispherical, 9 mm. in diameter, and the 

 cirri are LXX, 50-60, from 50 to 53 mm. in length; the apical cirri are only half as large 

 as the peripheral with half the number of segments, 25 mm. long with 25 to 30 segments, 

 but in most specimens this dimorphism is not so well marked, the apical cirri being 

 usually not very conspicuously smaller than the peripheral. 



The arms are about 230 mm. in length and are composed of 250 to 300 brachials. 



PI is 20 mm. long with nearly 100 very short segments. P 2 is 24 mm. long. P 3 

 is 25 mm. long with its component segments much longer than those in the two preceding 



