486 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



of the distal edge, one where the dorsal surface meets the lateral, the other on the lateral 

 corner. In most cases there is a third pair of tubercles proximal to, but slightly outside 

 the dorsolateral ones. The IBr, are not in apposition. 



The IBr 2 (axillary) is slightly wider than long. Its posterior angle is very obtuse, 

 its anterior acute. The anterolateral borders are nearly straight. They are strongly 

 everted into a frilled spinous edge. The whole dorsal surface of the ossicle is hollowed. 

 There are two or three tubercles on each side near the lateral corners. 



There is a single IIBr series which is composed of two ossicles, which bear no 

 tubercles. The first is shaped like the first brachial of an undivided arm, the second 

 (the axillary), like an axillary of the first division series, except that its proximal edge 

 is nearly straight. 



The first brachial is unusual and irregular in shape. The interior edge is much 

 shorter than the exterior. It is not straight, its proximal half being in contact with 

 that of its neighbor while the distal half diverges strongly. The distal edge is nearly 

 straight, not incised by the second brachial, but it lies obliquely across the arm. The 

 lateral edge is irregular; its proximal part is produced laterally and posteriorly into a 

 flange. There may be a strong tubercle on the proximal lateral corner and another 

 on the distal lateral corner. 



The second brachial is as long as broad and slightly wider distally than proximally. 

 Its distal edge lies straight across the axis of the arm. The first syzygial pair is as long 

 as its greatest proximal width. The interior edge is slightly longer than the exterior. 

 The hypozygal is considerably wider and longer than the epizygal. 



All but one of the 1 1 arms are broken off at the first syzygy, which is 1 .4 mm. wide. 

 The remaining arm is of 11 brachials. The fifth and sixth brachials are roughly oblong, 

 a little longer than broad and constricted in the middle. The second syzygial pair, 

 7 + 8, is considerably longer than broad. The epizygal is longer than the hypozygal; 

 its distal border runs obliquely across the arm. The ninth and tenth brachials are 

 triangular and considerably longer than broad. The last remaining brachial is a 

 hypozygal. The distal edges of the brachials are everted but not spinous. 



P! is stout and stiff, of 12 segments and 4 mm. long. The first segment is of an 

 irregular shape and about as long as broad. The following segments are regular, half 

 again to twice as long as broad, with slightly swollen and strongly spinous distal edges. 

 The last three or four taper rapidly to a point. 



P a is shorter, slighter and more evenly tapered than, but otherwise similar to, PI. 

 It is of 10 segments and 3 mm. in length. 



Notes. Of the four para types, the largest is like the type. There are from 15 to 25 

 cirrus segments. The tubercles on the division series and first brachials are not so well- 

 developed, but their distal edges are strongly spinous. All the arms are broken at the 

 first syzygy. A row of purplish spots, usually two to each ossicle, runs down the side 

 of each arm. There are similar spots on the first pinnules and some of the proximal 

 cirrus segments. 



Another specimen has the centrodorsal much more rounded and shorter than in the 

 holotype, with the dorsal pole flattened. It also has purplish spots on the sides of the 

 arms and division series. 



A third but younger paratype has the cirri XX, 19-28, arranged in two alternating 

 rows so that there are four in each radius. The dorsal pole of the centrodorsal is beset 

 with high tubercles. The radials and IBr series are relatively longer than in the 



