and 1.6 mm. from the apex to the interradial margin; bare 



interradial areas very irregular, about half as wide as the 



Ijacent cirrus sockets (nofth <>t Sumbawa; 2060 



Metr< minima 



e arrangement of the cirrus sockets more or less irregular, these being 



usually in two columns with additional sockets toward the proximal 



ntrodorsal; interradial furrows on the centrodorsal 



broad and distinct, trom as wide as the adjacent cirrus sockets to 



3 the entire cirrus bearing portion of the radial areas ; 



\ slender; arms about roo mm. long; cirri XI. L, 25, 35 mm. 



long southwest of Akyab, 'Burma; 489 Me tres) .... gracillima 



1. Psathyrometra fragilis (A. 11. Clark 1. 



A. 11. Clark. Proc. U.S. National .Museum, vol. 33, 1907, p. 80 [Antedon fragilis). 



2. Psathyrometra alascana A. II. Clark. 



1 'cscription in press.] 



3. Psathyrometra borealis A. H. Clark. 



.\. II. CLARK. Proc. U.S. National Museum, vol. 34, 190S, p. 236 [Psathyrometra borealis); 

 p. 237 [Psathyrometra profundorum). 



1 



4. Psathyrometra erythrizon (A. 11. Clark). 



A. H. CLARK. Proc. U.S. National Museum, vol. 33, 1907, p. 79 [Antedon erythrizi 



5. Psathyrometra bigradata (Hartla 



HARTLAUB. Buil. Mus. Comp. Zool., vol. 27, 1895, N' 4. p. 145, pi. 1, fig. 5 [Antedon bigradata). 

 A. II. CLARK. Buil. Mus. Comp. Zool., vol. 51, 190S. X " s, p. J40 [Psathyrometra sp.). 



6. Psathyrometra major A. H. Clark. 



A. II. ( LARK. Records of the Indian Museum, vol. 7, 1912, part 3. N" .:<>. p. 270 nomen 

 nudum; "Investigator" Stat. 115, 188— 220 fathoms). 



rom the Leyden Museum, vol. 34, 1912, ]). 140 [Psathyrometra major). 



t. 45. 7 24 S.. 1 [8 rs'.2 E. I lores Sea. 794 Metres. 1 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 horder; its sides are divided into 



five radial areas by five interradial furrows which are about as broad as the adjacent cirrus 



furrows are deeper and more V-shaped than those of Ps. mira. The cirrus 



emble those of Ps. mira, but the median incomplete column, instead of containing 



