") IS BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



The specimen from the Pelew Islands in the Hamburg Museum, which bears the 

 manuscript name Antedon pulcher Lutken, has about 40 arms, which are about 140 mm. 

 long. The centrodorsal is large, low hemispherical, 7 mm. in diameter at the base and 

 3 nun. in diameter at the concave dorsal pole. The cirrus sockets are arranged in 

 ( hree closely crowded irregular marginal rows. The cirri are about XL, 27-29, 25 mm. 

 long. The longer proximal segments are about as long as broad. Rather low and 

 l.lunt dorsal spines ure developed from the tenth or twelfth segment onward. The 

 cirri are, as usual, rather stout. The division series and arm bases are strongly convex 

 and rugged. P 3 is the longest pinnule, about 15 mm. in length, and is composed of 

 about 20 segments. 



The specimen from the Admiralty Islands has 28 arms 150 mm. long. The 

 longest cirri have 32 or 33 segments; dorsal spines are developed from the eleventh or 

 twelfth segment onward. P 3 is 15 mm. long, with 28 or 29 segments. This specimen 

 is intermediate in character between the two in the Leyden Museum upon which 

 Midler based the mimes fa gellata and elongata, though rather nearer the latter. 



Midler described Alecto elongata from New Guinea as follows: There are 20 

 arms 100 mm. long. The cirri are XV-XX, 23-25. The last 15-17 cirrus segments 

 bear dorsally a spurlike sharp process, and the outermost bears the terminal claw. 

 The axillaries are without a syzygy. Between two axillaries there is always only one 

 segment. Beyond the last axillary the third segment has a syzygy, and beyond that 

 there are 5-1 1 brachials between the syzygies (that is, the first syzygy is between 

 brachials 3+4, and the distal intersyzygial interval is 6-12 muscular articulations). 

 The pinnules at first increase in length so that the third is the longest. Then they 

 gradually decrease again. Their segments are rounded and smooth. The color is dark. 



Carpenter redescribed Midler's type specimen under the name of Antedon elongata 

 as follows: The centrodorsal is a moderately thick convex disk bearing the cirri in two 

 irregular rows around its margin. The cirri are about XXX, 25-30. The segments 

 are of tolerably even size, the sixth and four following ones being slightly longer than 

 broad. The succeeding ones bear slight dorsal spines, that on the penultimate enlarg- 

 ing somewhat as an opposing spine to the terminal claw. The radials are just visible. 

 The IBri are laterally united and are short, broad, and very convex. The IBr 2 (axil- 

 laries) are short, less than twice the length of the IBr,, and pentagonal, with wide 

 distal angles. The postradial series may divide three times. All the division series 

 are 2. The first ossicles immediately following each axillary are rhomboid al, closely 

 united laterally, and form with their successors a slight tubercular elevation in the 

 middle of their line of junction. The postradial series are well separated. The arms 

 are 20+ in number, about 125 mm. long, and consist of over 200 brachials. The 

 second brachials are bluntly wedge-shaped and slightly longer than the first brachials. 

 The first syzygial pair (composed of brachials 3 + 4) and the fifth brachial are short 

 and oblong. The next few brachials have slightly oblique terminal faces, and those 

 following are smooth, short, and sharply wedge-shaped, becoming shorter and blunter 

 about the fortieth brachial and squarer toward the ends of the long arms. The first 

 syzygy is between brachials 3 + 4, and the second is usually from between brachials 

 9 + 10 to between brachials 18 + 19. The distal intersyzygiid interval is 5-12, usually 

 7-9, muscular articulations. The first two pinnules are moderately short and slender, 

 the size increasing up to those borne on the sixth, seventh, and eighth brachials (P 3 , 



