A MONOGRAPH OF THE EXISTING CRINOIDS 479 



Liparometra grandis); Zool. Bidrag Uppsala, vol. 9, 1924, p. 78 (syzygies), p. 89 (articulations 

 in the IBr series), p. 285 (Trincomalie, Ceylon, 7 m.; details), p. 286, fig. 101, p. 87 (synarthrial 

 face), fig. 150, p. 98 (pinnule articulation). A. H. CLARK, Rec. Indian Mus., vol. 34, pt. 4, 

 1932, p. 551. GISL^N, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, pp. 20, 

 25, 33; Kungl. Fysiogr. Sallsk. Lund Forh., vol. 7, No. 1, 1936, p. 2 (Pulo Condor), p. 4 (Maccles- 

 field Bank), p. 12 (synonym of L. palmata), p. 14 (relation to L. moorei). 



Lamprometra similis A. H. CLARK, Proc. Biol. Soc. Washington, vol. 26, 1913, p. 144 (listed). 



Lamprometra subtilis A. H. CLARK, Proc. Biol. Soc. Washington, vol. 26, 1913, p. 144 (listed). 



Dichrometra protecla H. L. CLARK, Spolia Zeylanica, vol. 10, pt. 37, 1915, p. 85 (Ceylon; 2 speci- 

 mens), p. 93 (Ceylon). 



Dichrometra tenera H. L. CLARK, Spolia Zeylanica, vol. 10, pt. 37, 1915, p. 85 (Ceylon; notes), p. 93 

 (Ceylon). 



Lamprometra brachypecha H. L. CLARK, Carnegie Inst. Washington Publ. 212, 1915, p. 104 (descrip- 

 tion; Mer; ?Fiji). A. H. CLARK, Unstalked crinoids of the Siboga Exped., 1918, p. 100, footnote 

 1 (=L. protectus). H. L. CLARK, the echinoderm fauna of Torres Strait, 1921, p. 8 (collected 

 by the Carnegie Exped., 1913), p. 22 (Mer; Fiji; notes), pp. 192 ff. (range in Australia), pi. 2, 

 fig. 1 (colored), pi. 22, figs. 1, 2. 



Lamprometra protecta H. L. CLARK, The Echinoderm Fauna of Torres Strait, 1921, p. 23 (Ceylon; 

 Fiji; Philippines; discussion), pp. 192 and following (range); Rec. South Australian Mus., 

 vol. 3, 1928, p. 368 ("northern coast of Australia"; notes). A. H. CLARK, Journ. Linn. Soc. 

 (Zool.), vol. 36, 1929, p. 641 (use of the name). 



Lamprometra palmata A. H. CLARK, Journ. Linn. Soc. (Zool.), vol. 36, 1929, p. 641 (Muhlos, Maldives; 

 Flying-fish Cove, Christmas Island; Macclesfield Bank, 10-13, and 13 fathoms); Rec. Indian 

 Mus., vol. 34, pt. 4, 1932, p. 551 (listed; use of the name), p. 557 (localities; notes; parasitic 

 Melanella); Proc. Biol. Soc. Washington, vol. 47, 1934, p. 11 (Singapore; Christmas Island); 

 Temminckia, vol. 1, 1936, p. 303 (Maratoea; Paleleh; Sipankot; Sissie; Wotap; Obi latoe; Beo; 

 Laha; Lembeh Strait; notes). GISLN, Kungl. Fysiogr. Sallsk. Lund Forh., vol. 7, No. 1, 

 1936, p. 2 (Pulo Condor), p. 4 (Macclesfield Bank; French Indochina), p. 5 (range), p. 12 

 (localities; notes), p. 14 (relation to L. moorei). A. H. CLARK, John Murray Exped. 1933-34, 

 Sci. Reports, vol. 4, No. 4, 1936, p. 100 (range), p. 103. 



Diagnostic features.- P 2 is markedly stouter than the other proximal pinnules. 

 Though it is exceedingly variable in all its characters the superior length and stoutness 

 of P 2 make Lamprometra palmata palmata an easy form to recognize, when typically 

 developed. It intergrades completely with L. p. gyges. 



Description. The centrodorsal varies from a thin disk 3 mm. in diameter to a 

 thick disk with more or less strongly sloping sides 6 mm. in diameter. It is usually 

 large, 4-6 mm. in diameter, thick discoidal, with moderately sloping sides and with 

 the cirri arranged in two or two and a partial third, rarely a single, irregular marginal 

 rows. The bare dorsal pole is usually more or less strongly convex, more rarely flat 

 or even slightly concave, and measures 2.5 to 4 mm. in diameter. 



The cirri are XVIII-XLVI (usually about XXX), 20-30 (usually 22-25), 12 to 

 25 (usually 15 to 20) mm. long. They vary from slender to stout. The segments 

 may be all subequal and all broader than long, or those from the fourth-sixth to the 

 ninth-twelfth may be longer than those in the distal half, as long as broad or even up 

 to one-third again as long as broad. The segments in the distal half of the cirri are 

 more or less strongly compressed laterally and are usually more or less sharply carinate 

 dorsally, rarely bearing slightly or moderately developed dorsal spines. In lateral 

 view the distal half of the cirri is usually, but not always, slightly broader than the 

 proximal half. The opposing spine is moderate or small in size. 



The radials are either entirely concealed by the centrodorsal or their anterolateral 

 angles are more or less extensively visible in the interradial angles of the calyx. The 



