594 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



The IBr series and arm bases in general resemble those of the smaller and more 

 slender specimens of Leptometra phalangium. 



The 10 arms are about 80 mm. long. 



Syzygies occur between brachials 3+4, 9 + 10, and 16 + 17, and distally at inter- 

 vals of 3 or 4 muscular articulations. 



P, is very slender and delicate, 5 mm. long, with 11 or 12 segments, of which the 

 first is broader than long, the second is slightly longer than broad, the third is twice as 

 long as broad, and the following are much elongated. P2 is similar to Pj, 6.5 mm. long, 

 with 13 to 15 segments. P3 is 10 mm. long, with 15 to 16 segments, which after the 

 third become very greatly elongated; the fourth to seventh bear a fusiform gonad. 

 The following pinnules are similar to P3, the gonad disappearing after Pg. The distal 

 piimules are extremely slender, 15 mm. long, with about 22 segments, which beyond the 

 second are very greatly elongated with swollen articulations. 



Locality. — Gauss (German South Polar Expedition) station in the vicinity of 

 Gaussberg Gat. 66°02' S., long. 89°38' E.); 2725 meters; February 24, 1903 [A. H. 

 Clark, 1915] (1, Berl. M.). 



EOMETRA WEDDELLI John 



Eomelra weddelli John, in Vaney and John, Sci. Res. Voy. Scotia, 1902-04, Crinoidea, 1939, pp. 668-670 

 (Weddell Sea, 3426 meters; description; comparison with E. antactica) ; fig. 2, p. 669. — Tob- 

 TONESB, Bull. Inst. Oc&nogr. Monaco, No. 956, 1949, p. 4 (depth range). — Gisl£n, Rep. Swedish 

 Deep Sea Exped., vol. 2, Zool., No. 4, 1951, p. 56. 



Diagnostic features. — The centrodorsal is a third again as wide at the base as it is 

 high; the cirrus sockets are XXII-XXVII, the cirri about 18 mm. long, probably with 

 about 18 segments, of which the fifth to eighth are four times as long as broad; the lateral 

 corners of the radials are produced into interradial processes alongside the proximal two- 

 thirds of the IBri ; Pi has 10 segments, tapering evenly, the foiu:th and fifth segments are 

 three times as long as broad; P3 is between half again and t\vice as long as Pj. 



Description. — The centrodorsal is conical, with slightly rounded sides. The base 

 is a third again as wide as it is high, the diameter being 3 mm. The cirrus sockets are 

 arranged in 10 slightly irregular columns, their number is XXII-XXVII. The dorsal 

 pole is smooth and rounded. 



Only a single detached cirrus was found. This has 18 segments and measures 

 about 18 mm. in length. After the first two segments, all are longer than wide, the 

 fifth to eighth, which are the longest, being four times as long as broad. The distal 

 segments become progressively shorter. The distal ends of the elongated segments are 

 slightly wider than the proximal ends but there are no dorsal processes. The terminal 

 claw is short, curved and hyaline at the tip. There is no opposing spine. 



The lateral corners of the radials are produced into long interradial processes 

 running up alongside the IBri for about two-thirds or more of their length. In the 

 midline the radials are only a quarter as long as wide, but laterally they are four -fifths 

 as long as wide. The IBri are narrower than the radials and the IBrj (a.xillaries) 

 which incise them quite deeply. The axillaries arc about as long as wide, with all 

 four sides concave. 



Syzygies occur between brachials 3+4, 9 + 10 (exceptionally 10 + 11), and 15 + 16 

 or 16+17. A detached distal part of an arm shows syzygial pairs separated by two 

 brachials. 



