232 SMITHSONIAN -MISCELLANEOUS COLLECTIONS VOL.52 



fourth, ninth and tenth, and fourteenth and fifteenth brachials, and 

 distally at intervals of. in one specimen, three, and in another four, 

 oblique muscular articulations. 



First pinnule 6 mm. long, somewhat stiiT, slightly compressed, 

 tapering evenly from the base to the tip, composed of 12 joints, the 

 first not so long as broad, the third slightly longer than broad, the 

 fourth about half again as long as broad, the remainder about twice 

 as long as broad ; second pinnule half as long again (9 mm.), stouter 

 and stififer than the first, containing about 16 joints, the first about 

 twice as broad as long, the second squarish, the third rather longer 

 than broad, the remainder about twice as long as broad ; third pinnule 

 the longest and stififest, 13 mm. long, with 20 to 22 joints, the first 

 short, the second squarish, the following increasing in length, the 

 fifth and succeeding being about twice as long as broad, and slightly 

 longer distally ; fourth and fifth pinnules resembling the second ; 

 distal pinnules 9 mm. long with 18 or 19 joints, the first very short, 

 the second about as long as its proximal diameter, slightly trapezoidal, 

 the third and following greatly elongated and very slender, with 

 slightly expanded articulations. 



Mcasnrciiicnts.—Anri?. 80 mm., cirri 25 mm. to 30 mm. in length. 



Color (in spirits). — Yellow, the cirri white, the perisome brown. 



Type.— Cat No. 25450, U. S. N. M., from Albatross Station No. 

 5178; north of Tablas Island; 78 fathoms. 



Genus IRIDOMETRA A. H. Clark 

 IRIDOMETRA SCITA, new species 



This s])ecies comes nearest to /. psyche from Japan, in that the 

 second ])innule is much the largest and longest on the arm ; but it 

 may be at once distinguished by its cirri which, though containing 

 the same number of joints as those of /. psyche, have the proximal 

 joints elongated and "dice-box shaped." and the distal squarish : the 

 first and second pinnules also arc proportionately rather larger than 

 those of I. psyche, and have more numerous joints. 



Measiireiiieiits. — Arms 60 mm., cirri to mm. long. 



Color (in .spirits). — Purple, with blotches of darker. 



Type. — Cat. No. 25451, U. S. N. JNI.. from the Philippine Islands. 



Genus TRICHOMETRA A. H. Clark 

 TRICHOMETRA EXPLICATA, new species 



This new species resembles 7". aspera, of the West Indies, in its 

 general a])]jearance and in the character of its cirri, having fewer 

 joints in the latter than T. vcxator, of the Hawaiian Islands. .^11 



