544 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



Genus OLIGOMETRA. 

 OLIGOMETRA JAPONIC A (Hartlaub). 



Station 5356. — Two specimens. 



OLIGOMETRA GRACILICIRRA, var. ORNATA, new variety. 



In general similar to typical 0. gracilicirra; but the broad IBr 

 and first two brachials, instead of just coming into apposition laterally 

 and showing only a trace of lateral flattening, are sharply flattened 

 against their neighbors, their outer edges along the line of union being 

 strongly everted and strongly denticulate; the radials bear an 

 abrupt rounded dorso-ventrally elongate median tubercle; the IBr 

 series have an abrupt more or less tuberculated median ridge which 

 is continued on to the arm bases, becoming less noticeable as the 

 brachials become triangular, but traceable to the distal portion of the 

 arm; there is only a slight suggestion of this in typical 0. gracilicirra. 

 The color pattern is as in the specimens of 0. gracilicirra at hand, but 

 the color is much deeper. 



Type.— Cat. No. 27493, U.S.N.M., from station 5355. 



Two additional specimens were secured at this station. 



Station 5356. — Two similar specimens. . i 



Family TROPIOMETRID^. 



Genus CALOMETRA. 

 CALOMETRA ALECTO, new species. 



This new form belongs to that group of the genus including Calo- 

 metra multicolor, C. acanthaster, and C. spinossirna. 



Centrodorsal discoidal, moderately thick, the bare polar area flat, 

 4 mm. in diameter; cirrus sockets in a single slightly irregular mar- 

 ginal row. 



Cirri IX-XV, 39-46, 25 mm. to 30 mm. long, resembling those of 

 S. spinossima but somewhat more slender, especially distally'; there 

 is no ventral carination as in C. acanthaster. The first segment is 

 very short, the following gradually increasing in length to the fifth, 

 which is nearly or quite as long as broad; following to the twelfth 

 similar, then gradually decreasing in length, those in the terminal 

 third of the cirri being twice as broad as long ; after the fifth or sixth 

 the distal dorsal edge becomes prominent, distally gradually narrow- 

 ing and becoming higher and moving anteriorly, the dorsal surface 

 of the segments at the same time becoming strongly carinate so that 

 the short distal segments possess prominent, though small and 

 broadly rounded, dorsal spines which scarcely reach in height one- 

 quarter of the lateral diameter of the segments which bear them; in ' 

 the longer proximal segments there is more or less eversion of the ; 



