226 
and 1.6 mm. from the apex to the interradial margin; bare 
interradial areas very irregular, about half as wide as the 
adjacent cirrus sockets (north of Sumbawa: 2060 
Metres) mini ma 
■ e" arrangfenient of the cirrus sockets more or less irregular, these beinsj 
usually in two columns with additional sockets toward the proximal 
border of the centrodorsal ; interradial furrows on the centrodorsal 
broad and distinct, from as wide as the adjacent cirrus sockets to 
as wide as the entire cirrus bearing portion of the radial areas; 
very slender; arms about 100 mm. long; cirri XL — L, 25, 35 mm. 
long (southwest of Akyab, Burma; 489 Metres) .... gracilliiiia 
1. Psathyrometra fragilis (A. H. Clark). 
A. H. Clark. Proc. U. S. National Museum, vol. 33, 1907, p. So {AnliJon fragilis). 
2. Psathyrometra alascana A. H. Clark. 
[Description in press.] 
3. Psathyrometra boreal is A. H. Clark. 
A. H. Clark. Proc. U.S. National Museum, vol. 34, 1908, p. 236 {Fsatliyrouictra dorealis); 
p. 237 [Psatiiyroiiu'tra profundorum). 
4. Psathyrometra erythrizoii (A. H. Clark). 
A. H. Clark. Proc. U. S. National Museum, vol. 33, 1907, p. 79 [Aniidon crytlirizon). 
5. Psathyrometra bigradata (Hartlaub). 
Hartlaub. Bull. Mus. Comp. Zool., vol. 27, 1895, N''4, p. 145, pi. i, fig. 5 [Antedon bigradata). 
A. H. Clark. Bull. Mus. Comp. Zool., vol. 51, 1908, N" 8, p. 240 [Psatliyroinctra sp.). 
6. Psathyrometra major A. H. Clark. 
A. H. Clark. Records of the Indian Museum, vol. 7, 1912, part 3, N" 26, p. 270 (nomen 
nudum» "Investigator" Stat. 115; 188 — 220 fathoms). 
Notes from the Leyden Museum, vol. 34, 19 12, p. 140 [Psatliyroinctra major). 
Stat. 45. 7°24'S., 1 18° 15.2 E. Flores Sea. 794 Metres, i Ex. ■ 
The centrodorsal is sharply conical with the apex slightly rounded, 5.5 mm. in diameter 
at the base and 5.0 mm. from the apex to the interradial border; its sides are divided into 
five radial areas by five interradial furrows which are about as broad as the adjacent cirrus 
sockets; these furrows are deeper and more V-shaped than those of Ps. mira. The cirrus 
sockets resemble those of Ps. mira, but the median incomplete column, instead of containing 
