54g BULLETIN 82, UNITED STATES NATIONAL MUSEXIM VOLUME 1 



Dr. John says that thero is no strong contrast between the different kinds of 

 pinnules. In all, the distal edges of the segments are faintly flared out and produced 

 into spines; the flare is not strong enough to give the joints a swollen appearance. P, 

 is slender and tapers evenly from the base to the tip, 4 to 5 mm. long, with 13 rounded 

 segments, of winch all but the first two or three are longer than broad, the distal more 

 so than the proximal; the distal are up to three times as long as broad. Pa is similar 

 to P,, about .3 mm. long with 8 to 9 segments; it tapers more rapidly and its distal seg- 

 ments are more elongated. In the genital pinnules the first two segments are short, 

 the others longer than broad, the middle segments being more elongated than in the 

 oral pinnules. P3 is the first genital pinnule; it is slightly longer than Pj, 3 to 4 mm. 

 long with 8 to 9 segments. It bears a large egg-shaped gonad on the thu-d to fifth 

 segments— a testis, for the specimen is a male. The genital pinnules extend to P7 or 

 Pg; they are all of about the same number of segments as P3, but the distal are a little 

 longer, up to 5 mm.; their gonads are more fusiform, being along the third to sixth 

 segments. Tlie pinnules immediately beyond the genital pinnules are about 5 mm. 

 long with about 12 segments, the first two short, the others considerably longer than 

 broad. There are no complete distal pinnules. 



The disk is naked. Sacculi are few and inconspicuous. 



Along the pinnule ambulacra there are small rods, three to each pinnule segment, 

 which are perforated, forked, or branched at the end. They are very reduced side 

 plates and are better developed along the middle than the proximal segments. At the 

 ends of some, but not all, there are equally reduced cover plates. Dr. John says that 

 both are similar to, but more reduced than, those of Phrixometra nutrvi. 



The color in alcohol is white. 



Notes. — In 1939 Dr. John found two specimens among the B.A.N.Z.A.R.E. 

 collections which he believed to be of this species. They are considerably smaller than 

 the holotype, having the distance from the apex of the centrodorsal to the first syzygy 

 only 4 mm. as opposed to 5. .5 mm., and the width at the first syzj-gy is about 0.7 mm. 



The centrodorsal is slightly- shorter than its median diameter, which is about 1 mm. 

 It is a rounded cone with its proximal border produced into small interradial angles. 

 In one specimen the cirrus sockets are arranged in ten columns, which become irregular 

 proximally ; in the other the arrangement is indistinct. The sockets number XX-XXX. 



The single cirrus remaining is a peripheral one, but Dr. John says that it is immature 

 in appearance. It has 24 segments and is 7 mm. long. It is similar to, though smaller 

 than, those of the t\'pe. 



The radials are considerably wider distally than proximally. As in the type the 

 distal half is bent outwards. The IBri are much shorter, although, like the IBrz and 

 lower brachials, they are similar in shape to those of the type. Except for the rela- 

 tively greater length expected in a smaller specimen, the remaining brachials are also 

 like those of the type. The edges of the radials and IBri are spiny and the middorsal 

 surfaces of the IBro (axillaries) and lower brachials are raised into low spines. 



In one of the two specimens P, is nearly 2.5 mm. long, with 9 segments. The first 

 two segments are as long as broad, the third twice as long as broad, the rest three times. 

 Pj is of fewer segments and shorter, only 2 mm. long, with 7 segments, of which the third 

 to sixth are three times as long as broad. The whole pinnule tapers evenly. 



P3 is the first genital pinnule. AU are broken but a detached pinnule lacking 

 ambulacral grooves is probably a P3 or near it. With the two basal segments and prob- 



