[82 



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 

 <>r lcss swollen dorsal surface. 



Perissometra flexilis (P. II Carpenter). 



P. II. CARPENTER. ■Challenger" Reports. Comatulae, i888, p. 217, pi. \2 Antedon flexilis). 

 \. II. CLARK. Smithsonian Miscellaneous Collections, vol. 61, [913, N° 1;. p. 48 [Pachylo- 

 metra J 



ro. Perissometra lata (A. H. (Clark). ' 



A. 11. Clark. Proc. U.S. National Museum, vol. 33, 1907, p. 129 {Antedon lata). 

 Proc. U.S. National Museum, vol. 34, 1908, p. 312 {Charitometra lata). 



11. Perissometra timorensis (A. 11. Clark). 



A. 11. CLARK. Proc. Biol. Soc. Washington, vol. 25, 1912, p. 80 [Glyptometra timorensis). 

 io°39'S. ( i23°40 'E. Timor Soa. 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 smal 

 the cirrus sockets are arjranged in ten columns of two each, the columns closely crowded against 

 h 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 length or, in the longest cirri, half again as long as 

 the median length; the dorsal profile of the segments bevond the seventh or eighth is convex, 

 becomiiw graduallv 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 s< gments. 

 In the larger specimen there is only a mere tracé of this carination, which is very broadly 

 rounded off so that in lateral view the segments are regularlj convex dorsally. 



The ends of the basal rays are visible as flat triangular or irregular areas in the angles 

 of the calvx; the radials are entirely concealed, or are slightly visible as smal! irregular tubercles 

 or flat irregular areas in the angles of the calyx; the [Br, are short, broadly chevron-shaped, 

 the proximal and distal borders parallel, about tour times as 1, ro.nl as long; the proximal edge 

 is pp thin border overlapping and concealing the proximal portion oi the centro- 



dorsal. though flush with neral surface; the border of this produced proximal edge is 



usually irregularly scalloped or bears a few low coarse teeth, though it may be nearly plain; 

 • r ,1 few low tubercles; it may be evenly curved, becoming horizontal just 



