long; P a is much enlarged on the outer side of the IBr series, and considerably enlarged on 

 the innermost side of the IIBr series; 22 arms 75 mm. long; all of the P 3 's are enlarged, more 

 so than in the preceding; one with 23 arms 75 mm. long, similar to the first ; one with 30 

 arms 65 mm. long, also similar to the first. 



Liparometra A. H. Clark. 

 A. H. CLARK. Froc. Biol. Soc. Washington, vol. 26, 191 3, p. 143. 



Key to the Species of the Genus Liparometra. 



a 1 More than 30 (usually 32 — 36) cirrus segments 



b 1 P 2 and P 3 half again as long as P Y ; cirri long, rather slender, with prominent 



spines on the outer segments (Moluccas to northern Australia). articulata 

 tr P 3 and P., twice as long as Pj ; cirri rather short, and stout, the outer 



segments with very slight, or no, spines (southern Japan) . . . . grandis 

 ar 25 — 30 cirrus segments (Tonga Islands) rcgalis 



1 . Liparometra artiailata (J. Muller). 



J. MULLER. Abhandl. d. k. preuss. Akad. d. Wiss., 1847 (1849), p. 263 (Comatula [Alecto] 

 articulata). 



BELL. Report Zool. Coll. H. M. S. "Alert", 1884, p. 160, pi. 12, figs. A, Aa (Antedon articu- 

 lata and Antedon reginae). 



A. H. Clark. Buil. du Mus. d'hist. nat., Paris, 191 1, N" 4, p. 253 (Dichrometra articulata). 



Die Fauna Südwest-Australiens, vol. 3, 191 1, Lief. 13, p. 440 {Dichrometra articulata); 



p. 441 (Dichrometra reginae), and p. 443 (Dichrometra articulata and D. reginae). 



The Recent Crinoids of Australia, 191 1, p. 770 (Dichrometra articulata and D. reginae). 



Crinoids of the Indian Ocean, 19 12, p. 150 (Dichrometra reginae) and p. 152 (Dichro- 

 metra articulata). 



Smithsonian Miscellaneous Collections, vol. 61, 1913, N° 15, p. 31. 



Internationale Revue der gesamten Hydrobiologie und Hydrographie, 191 5, p. 223 



(Dichrometra articulata). 



Stat. 49a. 8°23'.5S., U9°4'.6E. 69 Metres. 2 Ex. 



Both of the specimens are much broken. The better may be described as follows: 



The centrodorsal is low hemispherical, 5 mm. in diameter at the base; the small dorsal 

 pole is strongly concave, 1 mm. diameter; the cirrus sockets are arranged in three closely 

 crowded irregular rows. 



The cirri are XXVII, 36 — 39, 30 mm. to 35 mm. long; the longest proximal segments 

 are from slightly longer than broad to about one third again as long as broad; prominent, 

 though small, dorsal spines are developed from the twelfth-fourteenth (usually fourteenth) seg- 

 ment onward. 



The division series are in close lateral contact through rather broad lateral extensions 

 which are straight edged and sharply flattened. 



There are 41 arms, all the IIIBr series and one IVBr series (external) being developed. 



P, is S mm. long- with 21 segments, resem blingr p but with the outer segments not 



