198 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



his dotails of the division of two postradiaJ scries given below. The number of 

 llll'.i 2 and IIIBr 4(3 M < he found to be approximately the same, and only 

 in a single specimen did the lllBr 4(3+4) series strongly predominate. He found the 



II Br series 2 in a few cases. He gave two examples of the arm division in his speci- 

 mens. En one of these one of the IIBr series is 4(3+4) and the other is 2. The 

 I lllir scries are 4(3+4) externally and 2 internally. The two inner IIIBr series 

 hear next to the midradial line of the postradial series as a whole a IVBr series, both 

 ..f these adjacent IVBr scries being 4(3+4). The outer IIIBr series following the 

 IIBr 2 series bears a IVBr 2 series on the outermost side of the postradial series as a 

 whole. In the other example of arm division both IIBr series are 4(3+4), and the 



I I I Br series are 4(3+4) externally and 2 internally. There are two IVBr series, one 

 next to the midradial line of the postradial series as a whole on either side; one of 

 these is 4(3 + 4) and the other is 2. 



The cirri of these specimens are up to 42 mm. in length and consist of 28-38 

 segments of which the distal are mostly quite without dorsal spines. P D and Pi are 

 almost equal. P D in the largest specimen has 22-24 segments and in the smaller 

 18-20. The segments are thick discoidal, broader than long, being longer than broad 

 only in regenerating pinnules. These pinnules measure 19-22 mm. in length. The 

 lower pinnules to and including P 3 and P c have entirely smooth overlapping distal ends. 

 Keichensperger noted that I had said that in smaller animals with P D only 13 mm. 

 long the segments of that pinnule have produced and spinous distal ends. My re- 

 mark referred to specimens from Singapore (H. martensi), which at the time (1909) 

 I believed to be conspecific with Hartlaub's specimens from Amboina. 



In Reichensperger's specimens the diameter of the disk is about 25 mm. The 

 color in alcohol is dark red-brown. 



One of the specimens from the Great Barrier Reef, as described by Dr. H. L. 

 Clark, has 29 arms and the cirri about XXX, 27-29. The other has 36 arms and the 

 cirri are XXXII, 29-33. In both specimens the cirri have the dorsal spines confined 

 to the outermost segments; seldom more than six segments show the spines clearly, 

 and often only one. 



The specimen from Biliton recorded by Professor Koehler is not completely 

 developed. There are 36 arms, which do not exceed 80 mm. in length, and IVBr 

 series are not present on all the rays. One of the IIBr series and two of the IIIBr 

 series are 2; all the other IIBr, IIIBr, and IVBr series being 4(3+4). 



The specimen from Akyab on the Burmese coast was described by Hartlaub as a 

 new spei lies under the name Antedon kraepelini. The centrodorsal is thick, strongly 

 concave in the middle of the dorsal surface, with the sides swollen. There were about 

 XXX cirri of which only two stumps remain. The radials are only slightly visible; 

 they are separated laterally. The IBr, are entirely free laterally. The IBr 2 

 (axillaries) are rather short, and are pentagonal. The IIBr series are 4(3+4). The 

 inner IIIBr series are always 2, and the outer are often 4(3+4). The articulations 

 between the elements of the division series arc smooth. The two ossicles immediately 

 following each axillary are partially united interiorly. There are 33 rough and rather 

 short arms from 40 to 50 mm. long which taper rapidly. From about the ninth on- 

 ward the brachials are very short and wedge-shaped with rather strongly produced 

 I ends. In the distal half of the arms they again become more discoidal. The 



