51S BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



records); Die Fauna Sttdwest-Australiens, vol. 4, Lief. 6, 1913, p. 311 (■= D. gygcs), p. 313 

 (correction of previous records). — H. L. Clark, Spolia Zeylanica, vol. 10, part 37, 1915, p. 85 

 (Ceylon; notes [see under L. palmata]), p. 93 (occurs at Ceylon). — Hartmeyer, Mitt. zool. 

 Mus. Berlin, vol. 8, Heft 2, 1916, p. 235 (Western Australia, No. 5965; later determined as 

 D. g;,. 



Antvdon articulata (Brit. Mus., MS.) A. H. Clark, Mem. Australian Mus., vol. 4, pt. 15, 1911, p. 

 722 (= Dichrometra tenera; Port Essington, Queensland [error]); Crinoids of the Indian Ocean, 

 1912, p. 148 (= Dichrometra tenera); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 32 ( = 

 Lampromdra gygcs; Port Essington; North of Cape Hillsboro'). 



Lamprometra gygcs A. H. Clark, Proc. Biol. Soc. Washington, vol. 26, 1913, p. 144 (listed); Smith- 

 sonian Misc. Coll., vol. 61, No. 15, 1913, p. 32 (published references to specimens in British 

 Museum; localities represented); Unstalked crinoids of the Siboga Exped., 1918, p. 100 (in key; 

 range). — H. L. Clark, The echinoderm fauna of Torres Strait, 1921, p. 8 (collected by the 

 Carnegie Exped., 1913), p. 23 (Mer; Mabuag, Torres Strait; notes; range; color), p. 192 and 

 following (range), pi. 1, fig. 4 (colored), pi. 21, figs. 4, 5, pi. 22, fig. 3; Journ. Linn. Soc. (Zool.), 

 vol. 35, 1923, p. 231 (Abrolhos Islands), p. 234 (Wooded Isle; characters). — McNeill and 

 Livingstone, Rec. Australian Mus., vol. 15, 1926, p. 193 (Port Darwin). — A. H. Clark, 

 Journ. Linn. Soc. (Zool.), vol. 36, 1929, p. 641 (Hermit Island; Australia). — H. L. Clark, 

 Grent Barrier Reef Exped. 1928-29, Scientific Reports, vol. 4, No. 7, 1932, p. 201 (Magneto 

 station XVII; or G. B. R. E. Gen Surv., A4). — Gislen, Kungl. Fysiogr. Siillsk. Hand!., new 

 ser., vol. 45, No. 11, 1934, p. 25. — H. L. Clark, Mem. Mus. Comp. Zool., vol. 55, 1938, p. 

 35 (Darwin, near Shell Island, 3-6 fathoms; Broome; False Cape Bossut; notes). 



Lamprometra tenera A. H. Clark, Proc. Biol. Soc. Washington, vol. 26, 1913, p. 144 Qisted). — 

 H. L. Clark, Carnegie Inst. Washington Publ. 212, 1915, p. 104 (Mer; Marshall Islands). 



Lamprometra protectus (part) A. H. Clark, Unstalked crinoids of the Siboga Exped., 1918, p. 100 

 (station 209). 



Diagnostic Jeatures. — Though elongated, P 2 is not enlarged; the basal segments 

 of the proximal pinnules are strongly carinate. In its typical form Lamprometra 

 palmata gyges is easy to recognize, but it intergrades completely with L. p. palmata. 



Description. — The centrodorsal is a moderately thick disk, with an uneven rather 

 small bare dorsal pole, which has an irregular border and is slightly concave. The 

 cirri are arranged in two or two and a partial third irregular rows on its sloping sides. 



The cirri are XXX-XL, 20-30 (usually 20-25), about 15 mm. long and slender. 

 The middle segments are slightly elongated, and the distal are somewhat compressed 

 and bear a dorsal tubercle. 



The radials are partially visible. The IBr, are entirely free laterally. The 

 lBr 2 (axillaries) are pentagonal. The postradial series may divide four times. All 

 the division series are 2. The post-radial series are in close lateral contact. The 

 articulation between the axillaries and the preceding segments is sometimes some- 

 what tubercular. The sides of the postradial series are without protuberances. 



The 32-43 arms are about 65 mm. long and are smooth and slender. The first 

 brachials are almost completely united interiorly; they are a little longer exteriorly 

 than interiorly. The second brachials are somewhat shorter. The first syzygial 

 pair (composed of brachials 3+4) is squarish. The following three or four brachials 

 are shorter and discoidal, and these are succeeded by about 27 rather short triangular 

 brachials. The remaining brachials are short, bluntly wedge-shaped, finally be- 

 coming more squarish. 



