NO. 1697. FIVE NEW UN STALKED CRIN0ID8— CLARK. 33 



the brachials is somewhat raised, but the remainder of the arm is 

 perfectly smooth. Syzygies occur between the third and fourth 

 brachials, again between the ninth and tenth or fourteenth and fif- 

 teenth (if the former, another occurs between the fourteenth and fif- 

 teenth or fifteenth and sixteenth), and thence at intervals of from 

 seven to seventeen oblique muscular articulations up to about the mid- 

 dle of the arm, beyond which point syzygies are rare or entirely 

 lacking. 



P^ mm. long with thirty joints, broad basally but tapering rap- 

 idly and slender and flagellate in its outer half; first eight joints 

 broader than long, very considerably so at first, the remainder squar- 

 ish; Po 13 mm. long with thirty joints, stout like P^ in its basal third 

 but tapering rapidly and slender and flagellate distally; first six 

 joints broader than long, the remainder squarish; the broad lower 

 joints, as in P^, are carinate; P3 19 mm. long, much stouter than P^ 

 or P„, but of the same general shape, stout basally, becoming grad- 

 ually slender distally with a flagellate tip, with thirty joints; P^ 20 

 mm. long, stouter and stiffer than P,, with about twenty-five joints, 

 the first ten broader than long, the following squarish, becoming 

 slightly longer than broad distally; like P3, P^ is carinate in its basal 

 half and has a low lateral keel in its outer two-thirds; P5 10 mm. 

 long, about as stout basally as Po, but not tapering so rapidly, with 

 seventeen joints, the first six longer than broad, the remainder squar- 

 ish; first seven joints strongly carinate; Pg and following pinnules 7 

 mm. long with sixteen joints, slender, about as stout as P^ proximally, 

 but not tapering so rapidly, the first five or six joints broader than 

 long and strongly carinate, then squarish, and finally slightly longer 

 than broad; distal pinnules 10 mm. long, moderately slender; the 

 carination of the lower pinnule joints gradually dies away at the end 

 of the proximal fourth of the arm. 



Color (in spirits). — Greenish yellow, the cirri purple in the outer 

 two-thirds; disk mottled green and brown; brachial and pinnule 

 perisome light blue. 



Type-specimen. — Cat. No. 25515, U.S.N.M., from Albatross sta- 

 tion 5147; off Balinpongpong Island (south of Jolo), Philippines; 

 21 fathoms. 



Family TKOPIOMETRIDzE. 



Genus PTILOMETRA A. H. Clark. 



PTILOMETRA SPLENDIDA, new species. 



Centro-dorsal columnar, 4 mm. long and 3 mm. in diameter, the 

 center of the dorsal pole concave and surrounded by five broad low 

 tubercles radially situated ; cirrus sockets arranged in ten evenly 

 spaced columns, usually three to a column. 

 Proc. N. ]M. vol. 37—09 3 



