OF THE SIBOGA-EXPEDITION. 139 
is slightly longer, the third is as long as broad or slightly 
longer than broad, the fourth is slightly longer, and the 
fifth and sixth are the longest, twice as long as the 
proximal diameter; the following gradually become laterally 
compressed and increase in lateral diameter so that, though 
they remain actually of the same length, they appear 
proportionately shorter, the last four before the penultimate 
being slightly longer than broad; in lateral view the cirri 
are distally about twice as broad as proximally; there are 
no dorsal processes; the opposing spine is short, sub- 
terminal to submedian, the base involving only a small 
portion of the dorsal surface of the penultimate segment, 
directed obliquely forward, in height scarcely equal to one 
third of the distal diameter of the segment; the terminal 
claw is somewhat longer than the penultimate segment, 
stout and strongly curved. 
The radials are just visible beyond the edge of the 
centrodorsal; their distal angles are separated; the IBr, 
are short, about four times as broad as long in the median 
line, trapezoidal, the lateral edges making an angle of 
nearly 120° with each other, widely separated interradially ; 
the axillaries are broadly pentagonal, the lateral edges 
nearly as long as those of the JBr, and making with 
them an angle of about 120°, the anterior sides making 
with each other an angle of about 90°; the synarthrial 
tubercles are rather prominent and are slightly produced 
anteriorly on to the axillaries; the first brachial is short, 
the inner edge rather less than one half as long as the 
outer, over twice as broad as the length of the outer edge, 
interiorly united basally but distally separated in a very 
broadly obtuse angle; the second brachial is about twice 
as large as the first, irregularly quadrate; the third and 
fourth (forming the first syzygial pair) are nearly twice 
as long interiorly as exteriorly, this inequality in length 
falling chiefly on the hypozygal, twice as broad as long 
in the median line; the next four brachials are slightly 
wedge-shaped, twice as broad as their greater length, 
Notes from the Leyden Museum, Vol. XXXIV. 
