157 



b 2 longest cirrus segments twice as long as broad, or slightly longer; profile 

 of the median keel on the elements of the IBr series and first tvvo 

 brachials even, or nearly so (Philippine Islands; 210 Metres) . . cristata 



1 . Stenometra quinquecostata (P. H. Carpenter). 



P. H. Carpenter. "Challenger" Reports. Comatulae, 1888, p. 262, pi. 3, figs. 6, a — d; pi. 38, 



figs. 1 — 3 {Antedon quinquecostata). 

 A. H. CLARK. Smithsonian Miscellaneous Collections, vol. 61, 1913, N" 15, p. 44 {Stenometra 



quinquecostata). 



2. Stenometra diadema (A. H. Clark). 



A. H. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 144 {Antedon diadema). 

 — Proc. U.S. National Museum, vol. 34, 1908, p. 310 {Tlialassometra quinquecostata). 

 - Vid. Med. fra den naturhist. Forening i Kobenhavn, 1909, p. 186 {Stenometra dorsata). 



3. Stenometra cristata A. H. Clark. 



A. H. Clark. Proc. U.S. National Museum, vol. 39, 191 1, p. 553 {Stenometra cristata). 



Daidalometra A. H. Clark. 



Key to the Species of the Genus Daidalometra. 



a 1 65-^-75 cirrus segments; cirri more than two thirds as long as the arms; 

 carination of the ossicles of the division series and of the proximal brachials 

 lovv and more or less blunted along the crest (sou t h west e r n Japan; 

 192 — 250 Metres) hana 



a 2 51 — 65 cirrus segments; cirri less than half as long as the arms; carination 

 of the ossicles of the IBr series and of the proximal brachials higher and 

 sharper (Port Denison, Oueensland, to Ti mor and the southern 

 Philppine Islands; o — 118 Metres) arachnoides 



1. Daidalometra hana (A. H. Clark). 



A. H. Clark. Proc. U.S. National Museum, vol. n, 1907, p. 137 {Antedon hana). 



2. Daidalometra arachnoides (A. H. Clark). 



A. H. Clark. Proc. U. S. National Museum, vol. 36, 1909, p. 402 {Stenometra arachnoides). 

 Zool. Anzeiger, vol. 39, 1912, N" 11 12, p. 428 {Stenometra acuta). 



Stat. 166. 2°28'.5S., 131° 3. 3 E. Ceram Sea. 118 Metres. 4 Ex. 

 Stat. 294. io°i2'.2S., I24°27'.3E. Timor Sea. 73 Metres. 6 Ex. 



.Of the specimens from Stat. 166 one has 10 arms and cirri with 54 segments; another 

 has 13 arms about 60 mm. long and cirri with 49 — 54 segments, 20 mm. to 25 mm. long; 

 the other two have 16 and 18 arms respectively. 



The largest example from Stat 294 has 12 arms about 60 mm, long; the cirri are 

 XII, 51 — 58, 25 mm. long; the others are all small, with 10 arms. 



