126 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Syzygies occur between brachials 3 + 4, again usually between brachials 9+10 and 

 14+15, the second often omitted, and distally at intervals of from 5 to 23 muscular 

 articulations. On some arms the third syzygy may be as early as between brachials 

 11 + 12, or it may be as late as between brachials 25 + 26. 



P a is absent. PI is 10 mm. long, stiff and moderately stout, with 12 segments 

 of which the first 2 are about as long as broad, the third is slightly longer, and those 

 following increase in length becoming twice as long as broad on the sixth, but shorter 

 again terminally; the last 5 segments have their distal ends armed with very prominent 

 spines. P 2 is 15 mm. long, stouter than PI, stiff and spinelike, with 15 segments of 

 which the first 2 are about as long as broad, the third is slightly longer than broad, and 

 the following increase in length, from the fifth onward being twice as long as broad 

 or even longer, the last 4 being short again. From the third onward the segments 

 have projecting and very spinous distal ends, especially in the distal half of the pin- 

 nule. P 3 is similar to P 2 and of the same length. P 4 is similar but with only the last 

 2 segments small, 13 mm. in length. P 5 is similar to P 4 and of the same length. P 6 is 

 slightly more slender than the preceding pinnules, but stiff and spinelike like them, 

 10 mm. long with 14 segments which resemble those of the preceding pinnule. The 

 next 3 or 4 pinnules are similar to P fl , but becoming very slightly more slender and 

 increasing slightly in the number of segments. The following pinnules are slightly 

 longer with more numerous and proportionately shorter segments which in the proxi- 

 mal portion have the ventrolateral edges produced into thin rounded triangular or 

 wedge-shaped processes of which the apex is the anterior angle; distally these processes 

 gradually become reduced to rounded ventral projections of the ventrolateral angle, 

 in the terminal portion disappearing altogether. The distal pinnules are slender, 

 14 mm. or 15 mm. long with 25 segments which have the distal ends produced and 

 finely spinous as in the preceding pinnules. The production of the ventrolateral 

 edges of the pinnule segments is not found much farther out than the middle of the 

 arm. 



The color in alcohol is pinkish white; or, deep violet, the middle of the dorsal 

 pole of the centrodorsal with a spot, the IBr series and proximal half of the arms with 

 a lateral line, of darker. 



Notes. The preceding description is based upon the two specimens collected at 

 Singapore by Svend Gad. 



One of the specimens from Bantayan reef, Cebu, has the arms 110 mm. long. 

 The cirri are XVI, 50-53, 40 mm. long. The longest cirrus segments are always 

 broader than long, usually one-third again as broad as long. 



The specimen from Singapore in the Berlin Museum collected by Professor von 

 Martens consists of an arm fragment. 



The specimen from Amboina recorded by Hartlaub has the centrodorsal with a 

 flat depression at the dorsal pole. The cirri are marginal. The cirri are XVI, 35-48, 

 about 23 mm. long. The segments in the proximal half of the cirri have produced 

 and spiny distal ends, and those in the distal half each bear two dorsal spines. The 

 longest lower pinnules are P 3 and P 4 which are of about equal size, 15 mm. long, and 

 are composed of 16 elongated segments. The segments of the very stiff and elongated 

 lower pinnules have produced and spiny distal ends. The length of the distal pinnules 



