l82 
on the second), about three times as broad as the median length; the broad smooth synarthrial 
tubercles are scarcely marked; the brachials have slightly produced distal edges and a more 
or less swollen dorsal surface. 
9. Perissometra flexilis (P. H. Carpenter). 
P. H. Carpenter. "Challenger" Reports. Comatulae, 188S, p. 217, pi. 42 [Antcdon flt-xiUs). 
A. H. Clark. Smithsonian Miscellaneous Collections, vol. 6r, 1913, N" 15, p. 48 (Puchylo- 
metra flexilis). 
10. Perissometra lata (A. H. (Clark). 
A. H. Clark. Proc. U.S. National .Museum, vol. 33, 1907, p. 129 [Antedon lata). 
Proc. U.S. National Museum, vol. 34, 1908, p. 312 [Chariioinetra lata). 
11. Perissometra timoreftsis (A. H. Clark). 
A. H. Clark. Proc. Biol. Soc. Washington, vol. 25, 19 12, p. 80 (Glyptoinetra tiuwrensis). 
Stat. 297. io°39'S., i23°4o'E. Timor Sea. 520 Metres. 4 Ex. 
The centrodorsal is very thick discoidal, the sides sloping slightly inward, 6.5 mm. in 
diameter at the base (5 mm. in the smaller specimen) and 3 mm. high (2.5 mm. in the smaller); 
the cirrus sockets are arranged in ten columns of two each, the columns closely crowded against 
each other and .showing no differentiation into pairs. 
The cirri are XX, 17 — 20, 20 mm. to 25 mm. long, stout; the first segment is very 
short, the following gradually increasing in length to about the seventh which, with the following, 
is about twice as broad as the median lenirth or, in the lono;est cirri, half aeain as long- as 
the median length; the dorsal profile of the segments beyond the seventh or eighth is conve.x, 
becoming gradually more strongly so toward the end of the cirri. 
In the smaller specimen the median portion of the distal dorsal edge of the segments 
is slightly raised, and at the same time a broadly rounded carination appears which slowly 
becomes higher and narrower, and very prominent on the segments beyond the eighth ; this 
carination has a straight distal border which is parallel to the longitudinal axis of the .segments. 
In the larger specimen there is only a mere trace of this carination, which is very broadly 
rounded off so that in lateral view the segments are regularly convex dorsally. 
The ends of the basal rays are visible as flat triangular or irregular areas in the angles 
of the calyx; the radials are entirely concealed, or are slightly visible as small irregular tubercles 
or flat irregular areas in the angles of the calyx; the IBr^ are short, broadly chevron-shaped, 
the proximal and distal borders parallel, about four times as broad as long; the proximal edge 
is produced into a thin border overlapping and concealing the proximal portion of the centro- 
dorsal, though flush with its general surface; the border of this produced proximal edge is 
usually irregularly scalloped or bears a i^^ low coarse teeth, though it may be nearly plain; 
it sometimes bears a few low tubercles ; it may be evenly curved, becoming horizontal just 
