464 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



is a syzygy between brachials 10+11. The distal intersyzygial interval is 10-15 mus- 

 cular articulations. The first pinnule is shorter than the second, which is of some length, 

 and the third than the fourth; most of the pinnules are very short. The disk is 10 

 mm. in diameter and is deeply incised. The color is flesh color. 



The two specimens from Siboga station 49a are both much broken. The better 

 may be described as follows: The centrodorsal is low hemispherical, 5 mm. in diameter 

 at the base; the small dorsal pole is strongly concave, 1 mm. in diameter. The cirrus 

 sockets are arranged in three closely crowded irregular rows. The cirri are XXVII, 

 36-39, from 30 to 35 mm. long. The longest proximal segments are from slightly 

 longer than broad to about one-third again as long as broad. Prominent, though 

 small, dorsal spines are developed from the twelfth-fourteenth (usually the fourteenth) 

 segment onward. The division series are in close lateral contact through rather 

 broad lateral extensions which are straight edged and sharply flattened outwardly. 

 There are 41 arms, all the IIIBr series and one (external) IVBr series being developed. 

 P! is 8 mm. long and is composed of 21 segments. It resembles P a , but the outer 

 segments are not quite so long. P a is 8 mm. long, with 21 segments, which, gradually 

 increasing in length, become as long as broad on the third and twice as long as broad 

 on the eighth and following. P 2 is 12 mm. long, with 24 segments, and is exactly 

 like P 3 . P 3 is very slender, 12 mm. long, with 21 segments, of which the first is very 

 short, the second is nearly as long as broad, the third is slightly longer than broad, 

 and those following slowly increase in length so that the ninth and following are 

 nearly two and one-half times as long as broad. P 4 is 6 mm. long, with 15 segments, 

 not quite so stout basally as P 3 and tapering more rapidly. Though very slender, 

 the proximal pinnules are all slightly stiffened. The disk is completely covered with 

 a pavement of rather small irregular plates. The color is light gray, with very narrow 

 black bands at the articulations; the cirri are white with the distal half light purple 

 ventrally, this increasing in extent distally. 



The second specimen has 23 arms. The division series are broad and are sharply 

 flattened laterally. The distal ends of the ossicles of the division series and of the 

 brachials are everted, producing a curiously rough appearance. The disk is completely 

 covered with small rounded calcareous plates. 



The specimen from Annam recorded by Dr. Gislen under the name of Lampro- 

 metra moorei seems to me undoubtedly a representative of this species. Especially 

 characteristic are the three lowest pinnules, which are of approximately the same 

 length and flexible, and the cirri. The division series are broad and sharply flattened 

 as in the smaller specimen from Siboga station 49a. 



The centrodorsal is discoidal, with the cirri in two closely crowded rows. The 

 cirri are XXX, 22-33, from 14 to 21 mm. long. The longest segment, about the 

 ninth, is one-third again as long as broad. From the ninth or tenth segment onward 

 there is a dorsal longitudinal carination developing into a distinct dorsal spine, which 

 appears a little distally of the middle of the segment. The height of the opposing 

 spine is equal to one-third the width of the penultimate segment. The terminal claw 

 is curved and a little longer than the penultimate segment. The radials are almost 

 concealed. The IBrt are six times as broad as long and are in lateral contact. The 

 IBr 2 (axillaries) are twice as broad as long. There is a small synarthrial tubercle on 

 the articulation between the IBr, and IBr 2 . There are no ventrolateral extensions 



