54 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Notes.— Of the three specimens from Albatross station 5424 two have 19 and one lias 

 20 arms from 100 to 110 mm. long; the cirri are 35-40 mm. long. These are somewhat 

 smaller and more delicate than the type specimen from Albatross station 5523, described 

 above, with slightly moro projecting edges on the elements of the division series and 

 proximal brachials. 



The specimen from Siboga station 95 is young with 13 arms 45 mm. long and the 

 longest cirrus 21 mm. long with 40 segments. 



One of the specimens from Menado Bay, Celebes, has 19 arms. The midradial 

 areas on the centrodorsal are triangular with the surface smooth and hollowed, the 

 curved proximal border exposing the spinous surface of the radial. At the rim of the 

 centrodorsal these bare midradial areas are twice the width of the adjacent cirrus 

 sockets, the converging sides coming to a point between the apical cirri. The cirri are 

 XXXV, 52-55, rather stout. The ornamentation on the sides of the IBr series is 

 composed largely of prominent isolated low tubercles. A similar specimen has 20 

 arms; the cirri have 58-61 segments. In some of the specimens the bare radial areas 

 on the centrodorsal are narrow, their basal width less than that of a cirrus socket, and 

 short, while in others they are broad. Some have the lateral ornamentation on the 

 division series entirely spinous, while in others it is more or loss tubercular. 



The specimen from Siboga station 253 was described as a new species, Cosmiometra 

 helene, in the following terms. The centrodorsal is moderate in size, truncated conical, 

 about 4.5 mm. broad at the base and about 2.5 mm. high interradially. The cirrus 

 sockets are arranged in 10 columns of 2 or 3 each; interradially the columns are in 

 close apposition, but in the midradial line they are separated by a wedge-shaped area, 

 at first about as broad as a cirrus socket, but with converging sides that come together 

 just beyond the last cirrus sockets; this bare midradial area is entirely covered with 

 fine, more or less sharp, granulations. The dorsal pole is irregular, 2 mm. in diameter. 



The cirri are moderately stout, 37-47 mm. long with 52-61 segments of which the 

 first four are very short, the fifth is over twice as broad as long, the sixth, a transition 

 segment, is half again as long as broad, and the seventh is slightly longer than the sixth. 

 The segments following gradually decrease in length, becoming about as long as broad 

 on the thirteenth, twice as broad as long on the twentieth, and shorter distally. Dorsal 

 processes begin on the thirteenth and gradually increase in height. The dorsal spines 

 are high and strongly carinate, V-shaped in end view, the two distal edges finely serrate. 

 At the tip of the cirri they become narrower and smooth. 



The radials are entirely concealed. The IB^ are short, about four times as broad 

 as the lateral length, slightly convex proximally, distally incised by a rounded process 

 from the axillary so that the median length is only about two-thirds of the lateral. 

 The proximal border is armed with very numerous fine short spines. The distal border 

 is similarly modified, but the spines become more-or-less obsolete in the median third. 

 The lateral borders are similarly modified, but the spines extend farther inward over 

 the dorsal surface of the ossicle and are more developed. The lateral thirds of the dorsal 

 surface of the IBr, are rather thickly covered with fine short spines. The IBr 2 (axil- 

 aries) are rhombic, somewhat over twice as broad as long, with the lateral angles 

 truncated. The lateral sides, formed by the truncation of the lateral angles, are only 

 about one-third as long as the sides of the IBr,. The proximal borders are modified 

 like the corresponding borders of the IBr,. The distal borders are very finely spinous. 



