22 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



entirely free laterally. The IBr^ (axiUaries) are pentagonal, and about 4 mm. long; 

 their free sides are longer than those of the IBr,. All the division series are composed 

 of 2 rather elongated ossicles of which the first is ahnost as long as the axiUary, and 

 the latter has a very wide distal angle. The two elements of the IIBr series together 

 measure about 6 mm. There are present low and feebly developed synarthrial 

 tubercles on the articulations between the elements of the division series. The two 

 ossicles immediately foUowmg each axillary are laterally united interiorly. The 

 postradial series divide 5, or occasionally 6, tunes. They are rather widely separated, 

 but they come again into contact at the base of the arms. The spaces between the 

 division series are filled by the dorsal surface of the very large disk. 



There are about 90 arms 175 mm. long. The amis are entirely smooth, and in their 

 proximal third, especially at the base, they are strongly compressed laterally, this 

 lateral compression decreasing distally. The first and second brachials are narrow 

 and long, and the first syzygial pair (composed of brachials 3 + 4) is still longer. The 

 following 8 or 9 brachials are rectangular, and are only shghtly longer than broad. 

 The brachials succeeding become rapidly shorter and are bluntly wedge-shaped. 

 In the distal half of the arms the brachials are very short and more discoidal. 



The first syzygy is between brachials 3+4, the second is at about the fiftieth 

 brachial, and the distal intersyzygial interval is from 8 to 13 muscular articidations. 

 Pi on the outer arms of the group borne by each IIIBr series is very long, wliile 

 the same pinnule on the other arms is short. Each postradial series therefore shows 

 eight long Pi wliich measure 35-40 mm. in length and are composed of about 50 

 elongated segments. P, on the inner arms of each IIIBr series is only 8 mm. long. 

 Pa measures about 6 mm. in length, and Pa 7 mm. The pinnules of the three following 

 pairs are of approximately the same size, and are 5-G mm. long. From the sixth 

 pair onward the pinnules gradually increase in length, finally reaching 16 mm. 



The disk is 49 mm. in diameter, and is plated and strongly incised. The borders 

 of the ambulacral grooves are much swollen, and in the vicinity of the mouth com- 

 pletely arch over the latter. The anal tube is long. The saccuh on the pinnules 

 are large and thickly set. 



The color is dark brown. 



Notes. — The preceding description is adapted from Hartlaub's description of 



three specimens from the Pelew Islands acquired from the Godeffroy Museum which 



he examined in the Hamburg Musemii, from which one was later sent to Gottingen. 



The specimen from Cebu in the Hambm-g Museum is of medium size. 



The specimen from Albatross station 5145 was described as a new species umder 



the name of Pontiometra insperatus in the following terms: 



The centrodorsal is hemispherical with the dorsal pole small and slightly convex. 

 The cirrus sockets are arranged roughly in three more or less crowded alternating 

 rows. 



The cirri are XX, 41-52, 30 mm. long, stout, but tapering in the distal half and 

 becoming comparatively slender at the tip The first segment is three times as broad 

 as long, the second and tliird are twice as broad as long, and those following gradually 

 increase in length to about the seventh which is about one-third again as broad as 

 long. The next three or four segments are similar, those succeeding gradually de- 

 creasing in length so that the segments in the distal third of the cirri are uniformly 



