21/ 



the relative proportions ot the lower pinnules, by some curious accident, were wrongly described. 

 Pj is 3.2 mm. long with 10 — 11 segments ; P., is 6 mm. long with 13 — 14 segments, propor- 

 tionately stouter than F 1 - 1 P s is 9 mm. to 10 mm. long with 17 — 19 segments, the largest 

 pinnule on the arm; P 4 is 4.5 mm. long with 13 segments; P. is 4.5 mm. long with 12 seg- 

 ments, slightly stouter than P t and hearing a genital gland. The cirri are about XXXV, 13 — 15, 

 10 mm. long; the longest segments (the third and fourth) are twice as long as the diameter 

 of the expanded ends; the last two before thé penultimate are only slightly longer than broad. 

 The arms are 60 mm. long. 



6. Dorometra aegyptica (A. H. Clark). 



A. H. Clark. Proc. U.S. National Museum, vol. 40, 191 1, p. 42 [Iridometra aegyptica). 

 Smithsonian Miscellaneous Collections, vol. 61, 19 13, N" 15, p. 53 {Iridometra aegyptica). 



7. Dorometra clymene nov. sp. 



Stat. 167. 2°35'.5S., i3i°26'.2E. Ceram Sea. 95 Metres. 1 Ex. 



The cirri are exceedingly slender, 9 mm. long, composed of 11 — 12 segments of which 

 the longer proximal are about four times as long as the diameter of the much expanded 

 dista! ends and the penultimate is twice as long as broad; the opposing spine is indicated 

 by a very minute tubercle, or is absent altogether; the terminal claw is very slender, and only 

 slightly curved. 



The arms are 40 mm. long, and resemble those of the other species of the genus. 



Pj is 2 mm. long with S segments. P 2 is 3.5 mm. long with 8 — 9 segments. P s is 

 4.5 mm. long with 9 segments. P 4 is shorter and smaller than P 3 . 



Hybometra A. H. Clark. 

 The only species in the genus Hybometra is 



1. Hybometra senta A. H. Clark. 



A. H. Clark. Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 54 {Hybometra 

 senta). 



2" d Subfamily Thysanometrinae A. H. Clark. 



Key to the Genera of the Subfamily Thysanometrinae. 



a 1 P., with the third segment as long as, or longer than, broad, and the fol- 

 lowing segments markedly longer than broad (southern Japan and the 

 Admiralty Islands; 126 — 355 Metres) Thysanometra 



a- P, with the third segment broader than long, and the fourth broader than 

 long, or about as long as broad (Caribbean Sea, and northward to 

 North Carolina; 13 — 1029 Metres) Coccometra 



StBOGA-EXPEDITIE XLII b. 28 



