212 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



On arms arising from a IIBr axillary and not quite of full size the first six brachials 

 are wholly without ornamentation, but the midline is rather narrowly rounded, or 

 faintly subcarinate. On the succeeding brachials the distal border is slightly thickened, 

 and the median carination becomes more distinct. On the earlier triangular brachials 

 the thickening of the distal edge disappears, leaving only the low median carination 

 which persists to the arm tips. 



PI is 1 1 mm. long with 29 segments and tapers evenly from the base to the slender 

 and flagellate tip. The first segment is twice as broad as long with the distal border 

 strongly concave. The second segment is narrower, about as long as broad at the base, 

 with diverging sides so that its distal angles overlap the base of the succeeding segment. 

 The following segments are of decreasing size, with less and less overlapping of the 

 distal corners, those after the fifth being very small and somewhat broader than long. 

 P 3 is 1 1.5 mm. long with 22 segments, similar to PI but less slender with larger segments, 

 all of which are broader than long. P 3 is 14 mm. long with 21 segments, most of which 

 are about as long as broad; it is considerably stouter than P 2 . P 4 is 14 mm. long with 

 17-18 segments of which the third to eighth are slightly broadened and the terminal 

 6 or 7 are about half again as long as broad. The following pinnules are similar. The 

 broadening is greatest on the fifth and sixth segments, later on the fourth and fifth, 

 from which point the pinnule tapers very gradually to the slender tip. 



The specimen from the Danish Expedition to the Kei Islands station 59 is small with 

 21 arms 90 mm. long. One IIIBr 2 series is present, externally developed. The 

 borders of the elements of the IBr series bear a few widely scattered beadlike tubercles. 



The specimen from the Sahul Bank is young. 



Localities. Albatross station 5356; North Balabac Strait, Philippines jBalabac Light 

 bearing S. 64 W., 15.5 miles distant (lat. 806'40" N., long. 1 1718'45" E.) ; 104 meters; 

 sand and shells; January 5, 1908 [A. H. Clark, 1911; F. W. Clarke and W. C. Wheeler, 

 1914, 1917, 1922 (given by error as station 5036)] (3, U.S.N.M., 35704). 



Challenger station 192;near the Kei Islands (lat.549'15"S.,long. 13214'15"E.); 

 256 meters; blue mud; September 26, 1874 [P. H. Carpenter, 1888; Hamann, 1907; 

 A.H.Clark, 1907, 1909, 1912, 1913, 1916, 1918;Hartlaub, 1912;Gislen, 1927, 1928, 1934] 

 (2, B.M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 3; 245 meters; 

 sand; March 31, 1922 (2, C.M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 8; about 300 

 meters; mud; May 5, 1922 (3, U.S.N.M., E. 3190; C.M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 46; 250 meters; 

 May 2, 1922 (1, C.M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 59; 385 meters; 

 May 12, 1922 (1, C.M.). 



Sahul Bank [Bell, 1894; A. H. Clark, 1911, 1912, 1913, 1916, 1918] (1, B.M.). 



Geographical range. From the Philippines southward to the Kei Islands and the 

 Sahul Bank. 



Bathymetrical range. From 104 to 385 meters; the average of six records is 257 

 meters. 



History. Antedon patula was described by Dr. P. H. Carpenter in his report 

 on the comatulids of the Challenger expedition published in 1888, his material consisting 



