296 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



minally, and the ends of the cirrus segments may become slightly flaring so that they 

 become prominent dorsally, though there is no tendency to form dorsal spines. 



The distal edge of the radials is even with the rim of the centrodorsal. The IBr, 

 are very short and broad, four or five times as broad as long, and are in close appo- 

 sition laterally. The IBrz (axillaries) are triangular, about twice as broad as long, 

 and approximately three times the length of the IBr,. 



The 10 arms are from 115 to 135 mm. in length. The first brachials are almost 

 oblong, though exteriorly sUghtly longer than interiorly, four times as broad as long, 

 or even slightly broader. The second brachials are exteriorly much longer than the 

 first, but the proximal and distal edges come almost to a point interiorly. Broad low 

 synarthrial tubercles are present. The first syzygial pair (composed of the brachials 

 3+4) is about as long as the second brachial in its greater (outer) length, but is more 

 bluntly wedge-shaped. The five to seven following brachials are discoidal or oblong, 

 about four times as broad as long, those succeeding becoming wedge-shaped or almost 

 triangular, very short, then wedge-shaped again, later almost oblong, gradually 

 elongating and at the arm tips being almost as long as broad. The four or five ter- 

 minal brachials are very small and short and are curved inward between the distal 

 pinnules which reach for 2 or 3 mm. beyond them. Beginning sometimes as early 

 as the third brachial, sometimes not until the twenty-fifth brachial, the middle of the 

 distal edge of each brachial is raised rather suddenly into a small tubercle which 

 gradually increases in height distally, becoming at the same time laterally compressed 

 and carinate, and gradually dies away toward the end of the arm. This carination 

 is very variable. In many specimens there is hardly more than a trace of it, while in 

 others it rises to a very considerable height forming a row of small but prominent 

 blunt teeth down the middle line of the arm, the teeth in the proximal half of the arm 

 standing vertically, those following gradually leaning distally. 



Syzygies occur between brachials 3+4, again from between brachials 9 + 10 to 

 between brachials 14 + 15, and distally at intervals of from 3 to 9 (usually 5-7) muscu- 

 lar articulations. 



Pi is 10-12 mm. long, slender, becoming almost filiform distally, prismatic, with 

 20-25 segments which are about as long as broad except for those in the terminal 

 portion which are elongated. P2 is similar to Pi, of about the same length or slightly 

 longer, somewhat stouter, and with a long, slender, fusiform gonad. P3 to Pj or P7 

 are of the same length as Pi and P2 but stouter with about 20 segments of which those 

 in the proximal half are broader than long, those in the middle are about as long as 

 broad, and the distal are slightly longer than broad. These pinnules bear elongate 

 fusiform gonads that reach to within seven segments of the distal ends. From Pe or 

 P7 onward the gonads become progressively shorter and occupy less and less of the 

 pinnule. At the same time the slender distal end of the pinnule becomes propor- 

 tionately longer and longer, the stout basal portion shortening with the decrease in 

 length of the gonad. After P15 the gonads are greatly reduced, and they disappear 

 entirely after Pig. The distal pinnules are 12 mm. long with 40-50 segments of which 

 the first two are considerably enlarged, the first being about twice as broad as long, 

 the second trapezoidal, and the remainder about twice as long as broad. These 

 pinnules are very slender and filiform. 



The color is violet, blotched, spotted, or banded in various ways and in varying 



