520 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



syzygial pair (composed of brachials 3+4) is nearly oblong, and has somewhat the 

 appearance of a dice-box. For the next three or four brachials there is no wedge- 

 shaped arrangement ; at first feebly indicated, it rapidly becomes more marked ; farther 

 out it diminishes, and the terminal brachials are nearly oblong. The earlier brachials 

 are flattened on their outer side. The first syzygy is between brachials 3+4, the next 

 about between brachials 16+17, and the distal intersyzygial interval is 10 or 11 mus- 

 cular articulations. Bell said that this species is at once to be distinguished from 

 Antedon (Dichrometra) flagellata by the fact that the third is shorter than the first 

 pinnule; of the first three pinnules the second is the longest. P! is but little shorter 

 than P 2 . The first three pinnules all have broad basal and elongated distal segments, 

 but though longer than the next succeeding they are by no means remarkable in their 

 length. The disk is 7.5 mm. in diameter and is incised. The arms are brownish 

 flesh color; the peristome is very much darker; the cirri are much darker on their 

 ventral than on their dorsal aspect. 



In the key to the species of the Palmata group in the Challenger report (1888) 

 Carpenter placed gyges under the headings two or more postradial axillaries (that is, 

 two or more axillaries following the IBr axillaries) , P 2 larger than P 3 , postradial series 

 in close contact laterally, cirri spiny, and P 2 considerably longer than P 3 , IVBr series 

 present, and the first syzygy always between brachials 3+4. It was paired with 

 palmata (=klunzingeri) from which it was said to differ in having over 30 cirrus 

 segments, Pj not much larger than P 2 [Carpenter meant smaller instead of larger], 

 and the lower brachials with flattened sides, whereas in palmata there are not over 

 25 cirrus segments, and PI is much smaller than P 2 . 



Hartlaub in his key to the species of the Palmata group (1891) placed gyges 

 under the headings two or more postradial axillaries (that is, IIIBr, or IIIBr and 

 IVBr series, present), P 2 longer than P 3 , postradial series in lateral contact, lower 

 pinnules of approximately equal size on all arms, spiny cirri, P 2 markedly longer than 

 P 3 , and the first syzygy always between brachials 3+4. It was paired with palmata 

 (=klunzingeri) from which it was said to differ in having over 30 cirrus segments, 

 P! not much shorter than P 2 , and the lower brachials with flattened sides, whereas in 

 palmata there are not over 25 cirrus segments, and PI is markedly smaller than P 2 . 



Hartlaub placed tenera (which he inadvertently called here tenerea) and impari- 

 pinna in a section characterized by having the lower pinnules larger on the outer 

 arms arising from each IIBr series than on the inner, this section being contrasted 

 with the section including reginae, gyges, and palmata, which was characterized by 

 having the lower pinnules of approximately equal size on all the arms. 



I examined the type specimen of gyges at the British Museum in 1910. The 

 cirri are XXXV, 24-29 (usually 28), 20 to 25 mm. long. From the eleventh onward 

 the segments are strongly carinate dorsally, or bear broadly rounded dorsal spines. 

 There are 41 arms (four being broken off), 80 mm. long. P 2 is the longest pinnule, 

 but it is slender, similar to PI but longer. P 3 is slender and weak, not nearly so long 

 as PI. The basal segments of these earlier pinnules are more or less carinate. 



The specimen collected at Thursday Island by M. Lix is small, with about 40 

 arms. 



According to Dr. H. L. Clark the specimen taken on the southwestern reef at 

 Mer has 27 arms about 60 mm. long. P 2 is conspicuously the biggest pinnule on each 



