546 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



ments; the cirri of this specimen are rather stouter than those of the 

 preceding; another has twenty arms 60 mm. long and cirri 60 mm. 

 long; another has twenty-one arms 65 mm. long, the longest cirrus 

 75 mm. long, with 106 segments; another has nineteen arms; another 

 has twenty-two arms 75 mm. long, the longest cirrus 80 mm. long; 

 another has twenty-three arms 65 mm. long and cirri 70 mm. long; 

 another has twenty-nine arms; another has twenty arms; one IIBr 

 series is lacking, but a IIIBr series is developed on one ray; seven 

 specimens have from twenty to twenty-five arms. 



Station 5593. — One specimen with twenty-three arms and the 

 longest cirrus 80 mm. in length, with 108 segments. 



As a general rule the cirri average about 5 mm. shorter than the 

 arms, though they are often the same length and may be even longer. 



IIIBr series are always external in position (2, 1, 1,2) as in all the 

 Tropiometridse in which they occur. 



Genus ASTEROMETRA. 

 ASTEROMETRA MAGNIPEDA, new species. 



Centrodorsal columnar, 5 mm. high and 6 mm. in diameter at the 

 base, the dorsal pole elevated into a high truncated conical process 

 about 3 mm. high, surmounted by a rosette of five small radial tuber- 

 cles; cirrus sockets in ten columns of three each, the two columns in 

 each radial area interiorly separated by about twice the distance 

 separating the columns of adjacent areas. 



Cirri XXX, 109-122, 100 mm. to 118 mm. long; first segment short, 

 the following gradually increasing in length and becoming about as 

 long as broad on the sixth; following segments similar or slightly 

 longer (rarely so much as half again as long as broad), in the distal 

 third of the cirrus very slowly becoming shorter, in the terminal 

 portion being somewhat over twice as broad as long; beyond the 

 proximal half of the cirri the segments very slowly become carinate 

 and develop a projecting distal dorsal edge which is centrally elevated i 

 into a small spine; this slowly increases in height, involving more 

 and more of the dorsal surface of the segment until in the very short 

 terminal segments a high carinate spine is found reaching nearly one- 

 half the lateral diameter of the segments in height, resembling the 

 same structure found in the other species of the genus ; last few seg- 

 ments rapidly tapering as in related species; a more or less marked i 

 transition segment occurs between the sixteenth and twenty-second; 

 (usually between the eighteenth and twentieth); ventral distal edge, 

 of the proximal segments slightly everted. 



Twenty arms 90 mm. long resembling, with the IIBr series, those 

 of Asterometra macropoda, though somewhat more slender basally;; 

 the dorsal surface of the division series and lower brachials is evenly! 

 and broadly rounded. 



