12 AUSTRALASIAN ANTAROTIO EXPEDITION. 
angles to the axis of the arm, forming (as viewed along the arm) a high rounded triangular 
coarsely spinous process. Shortly after the second syzygy the brachials become very 
obliquely wedge-shaped with strongly concave ends, not quite so long as broad, with the 
distal border rather strongly but evenly produced and coarsely spinous. Distally the 
brachials become gradually less and less obliquely wedge-shaped, and toward the end 
of the arms somewhat longer than broad and slightly constricted basally. The coarsely 
spinous production of the distal edge is conspicuous to the arm tips. 
Syzygies occur between brachials 3 + 4, 9 + 10 and 14+ 15, and distally at 
intervals of 3 muscular articulations. 
P, is 10 mm. long, very slender, flexible and flagellate, and is composed of 36 
segments of which the first is between two and three times as broad as long, those 
succeeding gradually increasing in length and becoming about as long as broad on the 
eighth and very slightly longer than broad on the thirteenth-fifteenth, the remainder 
being about as long as broad. The third-fifth segments have the outer edge (the edge 
toward the arm tip) somewhat swollen and produced into a roundedly angular blunt- 
edged process, which on the next two segments is truncated and lower. The last 
eighteen segments have the side toward the arm tip with a prominent rounded process 
which is minutely spinous on the crest, the distal profile of this portion of the pinnule 
being prominently scalloped as in Anthometra adriani. On the six or eight segments 
preceding these, going toward the base of the pinnule, the swelling of the edge of the 
segments becomes more and more restricted to the distal end, and also progressively 
lower, finally disappearing altogether. 
P, is‘of about the same length as P,, but it is considerably stouter basally, 
somewhat less flexible, and is composed of only 30 segments. The first segment is 
twice as broad as long, trapezoidal, the second is longer with the proximal angles 
broadly truncated, the third is about as long as broad, and the ninth and following are 
about twice as long as the width of their proximal ends. Distally the segments become 
shorter again, the last four or five being about as long as their greatest width. On the 
tenth segment the median portion of the distal border of the side toward the arm tip 
becomes swollen and minutely spinous. On the segments succeeding this swelling 
rises in height and extends basally so that the end of each segment on the side toward 
the arm tip projects some distance beyond the base of the following segment, the dorsal 
profile running in a straight line from the apex of this production to the base of the 
segment. Gradually the maximum height of this projection moves basally, and on the 
last four or five segments is about in the middle, so that the segments are seen to be 
provided, on the side toward the arm tip, with a conspicuous evenly rounded finely 
spinous blunt-edged crest. 
P, is 8 mm. long with 16 segments, somewhat stouter basally than P,, less flexible, 
and tapering evenly from the base to the tip. The first segment is about three times 
as broad as long, the second is broader than long with the proximal angles broadly 
trunceted, the third is nearly or quite half again as long as broad, the fifth is twice as 
