740 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



seventh and following are greatly elongated, becoming 5 or 6 times as long as broad 

 distally; the distal ends of the segments are expanded and finely spinous. 



P 2 is 11 mm. long, with 22 segments, exactly resembling P, but proportionately 

 stouter. 



P 3 is 8.5 mm. long, with 16 segments, tapering less rapidly than P 2 and hence 

 appearing less slender; the third segment is about twice as long as broad and those 

 beyond the fifth are greatly elongated. As in the preceding pinnules all the segments 

 have spinous distal ends. 



P 4 is about 7 mm. long, with 14 segments, resembling P 3 . P 6 is similar, with a fusi- 

 form gonad on the fifth to sixth segments. P 6 is similar, with the gonad on the fifth 

 to seventh segments. The distal pinnules are long and very slender, 13 mm. long, with 

 20 segments, most of which are greatly elongated. 



The color in life is bright yellow. 



Description of the type specimen. Hartlaub's description of the single specimen 

 which he examined is as follows: 



The centrodorsal is approximately conical with slightly convex sides. 



The cirri are XX-XXX, about 20, from 5 to 6 mm. long. The third to fifth seg- 

 ments are greatly elongated, and constricted centrally; those following rapidly become 

 shorter. The distal border of all the cirrus segments is produced, and the dorsal pro- 

 file of the cirri is strongly serrate. The distal ends of the cirri are somewhat compressed. 



The radials are somewhat shorter than the IBri, laterally free, with slightly concave 

 distal borders. The IBn are short, free laterally, and not incised. The IBr 2 (axillaries) 

 are rhombic. 



The 10 arms are apparently about 30 mm. long. The first brachials are short, 

 discoidal, not in contact. The second brachials are almost twice as long, and of vari- 

 able shape, sometimes more triangular, sometimes more quadrate. The first syzygial 

 pair (third and fourth brachials) is longer than the second brachial; each of its two 

 elements is as long as the first brachial. The 4 following brachials are almost oblong. 

 The second syzygial pan- (ninth and tenth brachials) is longer than the preceding seg- 

 ments. The following brachials are trapezoidal. 



Syzygies occur between brachials 3+4, 9+10, 14+15, and distally at intervals of 2 

 muscular articulations. 



P! is very slender; the segments in the middle and toward the end are fairly strongly 

 elongated and have produced and finely spinous distal borders. No PI is preserved 

 entire, but one retains as many as 15 segments. P 2 is 6 mm. long, with about 15 seg- 

 ments, of which the majority are strongly elongated. P 3 is shorter and is composed of 

 about 10 much elongated segments. P 4 appears to be the shortest. The segments of 

 all the following pinnules are much elongated. 



Localities. Albatross station 3363; near the Cocos Islands, off Panama (lat. 

 543'00" N., long. 8550'00" W.); 1788 meters; temperature 3.05 C.; white globi- 

 gerina ooze; February 26, 1891 [Hartlaub, 1895]. Type locality. 



Albatross station 3354; off Mariato Point, Panama (lat. 709'45" N., long. 8050' 

 00" W.); 589 meters; temperature 7.78 C.; green mud; February 23, 1891 [Hartlaub, 

 1895]. 



Albatross station 5692; southwest of San Diego, California Gat. 3123'45" N., 

 long. 11831'30" W.); 1967 meters; temperature 2.83 C.; density 1.02534; gray mud; 

 April 25, 1911 [H. L. Clark, 1923] (1, U.S.N.M., E. 1121). 



