IS6 DISCOVERY REPORTS 



the fifth is nearly as long as wide. The sixth to the tenth are slightly longer than wide; 

 they are wider distally than proximally but not so much so as in the third to fifth seg- 

 ments : they are of a more regular shape, not waisted. The eleventh and twelfth seg- 

 ments are as long as broad. The remaining segments are broader than long. Beyond 

 about the fifteenth the dorsal edge becomes curved instead of straight and on the distal 

 segments it is produced into a low, strongly rounded dorsal spine. The opposing spine 

 is strong and stands out at right angles ; the terminal claw is strong. 



The cirri, in common with the rest of the proximal half of the specimens, were orange- 

 yellow in life. The colour is lost in spirit. The first five or six segments are lighter than 

 the remainder. On many cirri the eighth to tenth segments are much darker, being a 

 rusty yellow, than the others. 



The radials are short narrow strips with concave and everted distal margins (Fig. "jb). 

 The costals are short, about one-sixth as long in the midline as they are wide. They are 

 in contact laterally. They are deeply incised by the posterior projection of the axillaries 

 which makes shoulder-like projections with them. The axillary is a little broader than 

 long. Its proximal edges are nearly straight whereas the distal are deeply concave ; it 

 follows that the posterior projection is broadly rounded, the anterior sharper. The edges 

 of the costals and axillaries are everted and finely thorny. 



Syzygies occur between brachials 3 + 4, 9 + 10 and 14 + 15, beyond which they are 

 numerous, the pairs being separated by two to three, or exceptionally four, brachials. 



The first brachial is short with a shghtly longer external than internal edge; its distal 

 margin is slightly incised by the second brachial. The second brachial is approximately 

 an equilateral triangle ; the distal edge is slightly concave. The internal edge of the first 

 syzygial pair is considerably longer than the external. 



The fifth to eighth brachials, between the first and second syzygial pairs, are roughly 

 rectangular, somewhat broader than long. They are alternately longer on one side than 

 the other. For some distance beyond the second syzygy the brachials are triangular and 

 about as long as broad. Farther out on the arm they are quadrangular with one side, 

 alternate sides in successive brachials, considerably longer than the other; they are 

 slightly longer than broad. The distal edges of the lower brachials, between the first and 

 the third or fourth syzygial pairs, are produced into single rows of strong tooth-like 

 spines; those of the more distal segments are smooth. 



Pi and P2 are incomplete or hidden. P3 and Pt are each about 5 mm. long. P^ is of 

 1 1 segments and tapers to the distal end (Fig. 7 c). The first segment is as long as 

 broad; the second and third are slightly longer than broad. The fourth and fifth are 

 about twice as long as broad. The slender distal segments are longer, three or more 

 times as long as broad. The distal edges of the more distal segments are produced into 

 strong spines. The ventral side of the pinnule is thickly covered with sacculi, though 

 there is no ambulacral groove. 



Pi, is usually an oral pinnule of 9 slender evenly tapering segments. The first is about 

 as long as broad, the second slightly longer. The remainder are elongated : the third is 

 twice, the fourth about three times, as long as broad ; the fifth to ninth are about five 



