218 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



In color the two last are yellowish white, the pinnules with occasional small ir- 

 regular blotches of light purple; the cirri are white, becoming rusty brown at the tip, 

 each segment with a saddle of dull purplish. 



The specimen from Singapore collected by M. Maindron is small, with 13 arms. 

 The two IIBr series are 4(3+4). The single IIIBr series, which is internally de- 

 veloped, is 2. The cirri have 28-34 segments. This specimen resembles the following. 



The specimen collected by Svend Gad at Singapore has the centrodorsal moderate 

 in size, discoidal, with the bare polar area flat. The cirri are XI, 36-40, 35 mm. long, 

 very stout basally but tapering, with especial rapidity in the distal third, to a very 

 sharp and slender tip. The first segment is very short and those following gradually 

 increase in length to the seventh, which is about as long as broad, after the middle of 

 the cirrus becoming very gradually longer than broad, and about half again as long as 

 broad in the terminal portion. The terminal claw is long and slender, about as long 

 as the penultimate segment, and is slightly curved. There are 19 arms. Four IIBr 

 series are present, one on each of four postradial series; all of them are 4(3+4). Two 

 of the IIBr series bear two IIIBr series each, and the two other IIBr series bear a single 

 IIIBr series each, developed internally. All the IIIBr series are 2. Pj is about 5 mm. 

 long and is composed of 18 segments all of which are about as long as broad, and the 

 second-fifth are rather strongly carinate. P 2 is 11 mm. long, much stouter than P t 

 but tapering evenly to a slender and delicate tip, and is composed of 28 segments, 

 which at first are about twice as broad as long, becoming about as long as broad on about 

 the sixth, then slowly increasing in length and being about twice as long as broad dis- 

 tally, but shorter again terminally. P 3 is 20 mm. long, stouter than P 2 but, like it, taper- 

 ing evenly to a slender and delicate tip. The fourth-sixth segments are about as long as 

 broad, and those following gradually increase in length, being about twice as long as 

 broad distally. The second-fifth or -sixth segments are, as in P 2 , rather strongly 

 carinate. P 4 is shorter than P 2 and is less stout and stiff; like the pinnules following 

 it is composed of mostly squarish segments. 



One of the specimens from off Cape Jabung has 28 arms, and another has 22 arms. 



Nine of the specimens from near Deli have 22 (one), 23 (two), 24 (three), 26 (one), 

 28 (one), and 29 (one) arms. In the specimen with 28 arms the arms are about 140 

 mm. long. 



In one of the specimens from Malacca Strait near the mouth of the Deli River 

 there are 35 arms; all the IIIBr series are 2. 



Prof. Ludwig Doderlein recorded two specimens from Amboina without comment. 

 He gave a reference to Hartlaub, and it is quite probable that he determined the speci- 

 mens from Hartlaub 's description and figures. If this is true they represent Hetero- 

 metra amboinae and not this species. 



The specimen from Hongkong described as Antedon ludovici by Carpenter pre- 

 sented, according to him, the following characters: The centrodorsal is a thick disk 

 with a flattened dorsal surface and a single or partially double row of cirri. The 

 cirri are XXV, 40-50. The cirrus segments are tolerably equal, all of them, except 

 for those at the extreme end, being broader than long. Even in these terminal seg- 

 ments the length is but little greater than the width ; they bear a slight tubercle in the 

 middle of the dorsal surface which is most marked on the penultimate segment. The 

 radials are partially visible. The IBri are short, widely oblong, almost completely 



