530 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



that in life this species is black. On immersion in fresh water a reddish-brown pig- 

 ment dissolves out instantaneously. His observations were based upon the specimens 

 recorded by Mortensen. 



The specimen from Gimsah Bay is a fine example of the species, with 29 arms 

 120 mm. long and I he cirri XXVII, 21-24. The dorsal pole of the centrodorsal is 

 :\ mm. in diameter and is slightly concave. 



In the specimen from Um-el-Jerman the centrodorsal is thick discoidal, with a 

 flat dorsal pole 2.5 mm. in diameter. The cirrus sockets are arranged in two irregular 

 closely crowded marginal rows. The cirri are XIV, 24-25 (usually the former), and 

 are 20 mm. long. The longest proximal segments are about one-third again as long 

 as broad. The distalmost 8 or 10 segments are slightly broader than long and bear 

 a well-marked median dorsal keel, which on the outermost shortens into a small 

 tubercle. There are 30 arms 115 mm. long. The division series are well rounded 

 dorsally and well separated laterally. The arms are perfectly smooth dorsally. 

 P, is 13 mm. long and is composed of 28 segments. It tapers rather rapidly for the 

 first four segments, then becoming more slender and tapering gradually to the tip. 

 The first segment is about twice as broad as long, and those following gradually in- 

 crease in length so that the fourth is about as long as broad ; the segments beyond the 

 seventh are about one-third again as long as broad, and the terminal are half again 

 as long as broad. The first three segments have their distal angles slightly cut away, 

 hut this feature is absent from those following. P 2 is 14 or 15 mm. long, with 30 seg- 

 ments, slightly stouter and stiffer than P, and tapering more evenly from the base, 

 though otherwise exactly resembling it. P 3 is 11 mm. long, with 23 segments, of 

 which the distal, as in P 2 , are about twice as long as broad. The pinnule is about as 

 stout basally as P t but tapers very evenly and gradually. It is considerably more 

 slender than P 2 . P 4 is 6.5 mm. long, with 17 segments, and is essentially like P 3 . P 5 

 is 5.5 mm. long, with 16 segments, and resembles P 4 . The pinnules following resemble 

 P 6 , later becoming longer and slenderer. The distal pinnules are 8 to 9 mm. long, 

 very slender, with 19 to 21 segments. This specimen is dull flesh color, with broad 

 bands of black on the arms. The dorsal half of the cirri is dull flesh color, and the 

 ventral half is black. 



The specimen from Kosseir was described by Dr. Clemens Hartlaub as a new 

 species, Antedon klunzingeri, as follows: The centrodorsal is approximately hemi- 

 spherical and is entirely covered with cirrus sockets. Only three cirri are present. 

 The consist of about 20 segments and are 11 mm. long. They have a smooth surface. 

 The segments from the fifth to about the twelfth are longer than broad. The number 

 of the cirri, judged from the vestiges present, was about XXX. The radials are 

 partially visible. The IBr, are entirely free laterally. The IBr 2 (axillaries) are 

 pentagonal, not twice as long as the IBr,, with moderately sharp angles and slightly 

 concave distal edges. The division of the different postradial series is irregular. 

 None divides more than three times, and the number of arms on a single postradial 

 -cries does not exceed four. One of the postradial series bears two arms and another 

 three. The articulation between the axillaries and the preceding ossicles is entirely 

 smooth, and the outer edges of the postradial series are smooth. The ossicles imme- 

 diately following each axillary are only partially united interiorly. There are 17 

 arms 100 mm. long with a smooth dorsal surface and composed of moderately short 



