430 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



sides, which bear about 25 cirri in an irregular double row. The cirri are XXV, 25. 

 The fourth segment is longer than broad, the next three are the longest, and those 

 following diminish gradually in length. The penultimate segment bears a tolerably 

 strong opposing spine. The radials are barely visible. The IBrt are oblong and are 

 not united laterally. The IBr 2 (axillaries) are pentagonal, relatively short, with a 

 wide distal angle; they are only half again as long as the IBrj. The ventrolateral 

 borders of the IBr axillaries and of the three or four following ossicles bear small 

 irregular tubercles. The IIBr series, IIIBr series, and IVBr series (when present) 

 are 2. The ossicles immediately following each axillary are almost completely united 

 interiorly. The 28 arms are 100 mm. long and consist of nearly 200 brachials. The 

 first brachials are widely rhomboidal. The second brachials are of about the same 

 length, but are more wedge-shaped. The first syzygial pair (composed of brachials 

 3+4) is nearly square. The next four brachials are oblong, and those following are 

 wedge-shaped and of medium length, with very slightly overlapping distal ends. 

 The later brachials are blunter and more oblong, becoming squarer and slightly elon- 

 gated at the arm ends. The muscle plates of successive brachials stand up rather 

 prominently, alternately on either side of the ambulacral groove. Syzygies occur 

 between brachials 3+4, again from between brachials 16 + 17 to between brachials 

 19+20, and distally at intervals of 4-11 (usually 6-8) muscular articulations. 



PI is moderately long, but slender, and P a is shorter than P t . The pinnules of 

 the next pair (P 2 and P b ) are longer than P,, and are stiff, tapering, and styliform, 

 consisting of about 15 elongated segments. P 2 is longer than P b , reaching 15 mm. in 

 length. P 3 is stiff but shorter again, and the following pinnules decrease until about 

 the tenth brachial, after which the size increases slowly. Toward the arm ends the 

 pinnules become slender and filiform, but they never reach the length of the pinnules 

 of the second pair. The disk is 17 mm. in diameter, naked and much incised. Sacculi 

 are closely set along the pinnule ambulacra. The color in alcohol is dorsally light 

 purplish red, with darker bands at the articulations; the perisome is very much darker, 

 almost black. 



Hartlaub reexamined the type specimen of spicata at Leyden and compared it in 

 detail with his new species Antedon (= Stephanometra) oxyacantha. He said that 

 judging from the type specimen, spicata is a much more slenderly built species though 

 otherwise in its general habitus very similar to oxyacantha. The postradial series, how- 

 ever, are not widely separated laterally as is the rule in oxyacantha but are more nearly 

 hi lateral contact. The pinnules of the first pair (P t and P a ) are slender and flagellate 

 and reach, as given in Carpenter's latest statement (concerning the specimen from the 

 Mergui Archipelago), almost the length of the pinnules of the following pair (P 2 and 

 P b ), while in oxyacantha they are usually markedly shorter than the pinnules of the 

 second pair. P 2 is composed of 16 and more segments and is less markedly spiny than 

 P 2 in oxyacantha, which is composed of 12, or at the most 15, segments. P 3 is markedly 

 shorter than P 2 and, as is shown in Carpenter's figure, is less procumbent and stiff, 

 while in oxyacantha occasionally it is longer than P 2 and is quite as markedly spini- 

 form. In spicata the outer pinnules are slender and filiform, a feature that Hartlaub 

 considered as very characteristic of that form. 



I examined this specimen at Leyden in 1910. The cirri are XXIII, 22-25, 

 rather slender, resembling those of such species as S. protectus. The longest cirrus 



