NO. 1798. CRIN0ID8 COLLECTED BY THE ALBATROSS— CLARE. 559 



the adult; the peripheral cirri are XIV, 19-20, 21 mm, long; the 

 centrodorsal is of the characteristic shape. 



Station 5349. — One large specimen resembling the type. 



Suborder MACROPHREATA. 

 Family ANTEDONID^. 



Subfamily u?^N"TIGI30ISri]Sr-<E. 

 Genus IRIDOMETRA. 



IRIDOMETRA EXQUISITA A. H. Clark. 



Station 5483. — One specimen with arms about 50 mm. long and 

 cirri 11 mm. long, somewhat more robust than the type. 



IRIDOMETRA PARVICIRRA (P. H. Carpenter). 



Station 5355. — One specimen. 



IRIDOMETRA MELPOMENE, new species. 



Centrodorsal low, hemispherical, the small dorsal pole papillose; 

 cirrus sockets arranged in three or four closely crowded alternating 

 rows, the proximal with four sockets in each radial area. 



Cirri XXX-L, 15-19 (usually 16-18) 10 mm. to 14 mm. (usually 

 12 mm. to 14 mm.) long, very slender, and strongly compressed lat- 

 erally; first two segments about twice as broad as long, third slightly 

 longer than broad, fourth or fifth to sixth or eighth three to four 

 times as long as broad, the following gradually decreasing in length, the 

 four to six outermost segments being about half again as long as their 

 distal diameter; both ends of the long lower segments and the 

 distal end of the shorter outer segments somewhat enlarged; no dor- 

 sal spines; opposing spine prominent, terminal directed slightly 

 anteriorly. 



The calyx and arms resemble those of /. adrestine, to which species 

 this new form is most closely allied. 



Pi 7.5 mm. long, moderately slender, with sixteen segments, the 

 more distal somewhat over twice as long as broad; Pj similar, 8 mm. 

 long with sixteen segments; Pg 6 mm. long with thirteen segments; 

 P4 5 mm. long; following pinnules similar, gradually becoming longer, 

 reaching a length of 9 mm. distally. 



The color is a light yellow brown, the sides of the arms and of 

 the division series, and the cirri, white; the perisome is dark purple. 



Type.— Cat. No. 27506, U.S.N.M., from station 5311. 



Five other specimens were obtained at this station. 



