A MONOGRAPH OF THE EXISTING CRINOIDS 523 



lacral groove that is practically equal to two of the others which divides immediately 

 on leaving the peristome, so that apparently eight ambulacral furrows converge at 

 the mouth. The cirri are XLV, 27-31, from 17 mm. to 20 mm. long, and slender. 

 The longest proximal cirrus segments are slightly constricted centrally. The shorter 

 distal segments have rounded dorsal spines which become more pointed terminally. 

 On some arms Pi is very nearly, or even quite, as stout basally as P 2 , though it tapers 

 more rapidly. The lower pinnules are all badly broken. In general this specimen 

 agrees well with others at hand from the Marshall Islands. 



Remarks. — Lamprometra palmata gyges is only an extreme variant of L. palmata 

 characterized by the extreme slenderness of the lower pinnules. Complete intergra- 

 dation occurs between typical palmata and typical gyges. Lamprometra palmata 

 gyges is the dominant form in the Australian region and in Polynesia, but individuals 

 occur in the Torres Strait region and in Tonga, Fiji, and the Marshall Islands that 

 approach, and indeed are even in some cases more or less typical of, L. p. palmata. 

 Similarly at Ceylon, in the Lesser Simda Islands, at Celebes, and elsewhere within the 

 area occupied by L. p. palmata occasional individuals are found that are quite indis- 

 tinguishable from L. p. gyges. 



Localities. — Ebon, Marshall Islands; Rev. B. G. Snow, April 14, 1877 [A. H. Clark, 

 1911; H. L. Clark, 1915] (9, U.S.N.M., 35248; M. C. Z., 61, 292). 



Samoa [Lutken, 1877]. 



Suva reef, Fiji (1, M. C. Z., 293). 



North of Cape Hillsborough, Queensland; H. M. S. Rattlesnake [A. H. Clark, 

 1913] (1,B. M.). 



Port Denison, Queensland [Lutken, 1877; A. H. Clark, 1907, 1909]. Same [Hart- 

 laub, 1891; A. H. Clark, 1907, 1911, 1912] (2, H. M.). Same [A. H. Clark, 1911] 

 (1, U.S.N.M., 35261). 



Bowen, Queensland [A. H. Clark, 1911, 1912] (1, H. M.). Same; Mus. Godeffroy, 

 1877 [A. H. Clark, 1909, 1911] (2, C. M.). 



Queensland [Hartlaub, 1890, 1891; A. H. Clark, 1907, 1911, 1912]. 



Thursday Island; 5-7 meters: H. M. S. Alert [Bell, 1884; P. H. Carpenter, 1888; 

 Hartlaub, 1891; A. H. Clark, 1907, 1911, 1912, 1913, 1918; H. L. Clark, 1921] (1, 

 B. M.). 



Thursday Island; M. Lix, 1891 [A. H. Clark, 1911] (1, P. M.). 



Mer, Murray Islands, Torres Strait; east flat; H. L. Clark, September 25, 1913 

 [H. L. Clark, 1915, 1921] (1, M. C. Z., 591). Same, south reef; H. L. Clark, Septem- 

 ber 26, 1913 [H. L. Clark, 1915, 1921] (1, M. C. Z., 593). Same, southwestern reef; 

 H. L. Clark, September 26, 1913 [H. L. Clark, 1915, 1921]. 



Great Barrier Reef Expedition; Magneto station XVII; about one-quarter mile 

 north of North Direction Island; 35 meters; sand, thick Halimeda; March 9, 1929 

 [H. L. Clark, 1932]. This specimen also bore the label G. B. R. E. General Survey, 

 24/4/29, A4. 



Reef north of Mabuag, Torres Strait; Frank A. Potts, November 1913 [H. L. 

 Clark, 1921] (4). 



Mabuag, or Port Moresby, New Guinea; Frank A. Potts, November 1913 (1, 

 U.S.N.M., 36280). 



