A MONOGRAPH OF THE EXISTING CRINOIDS 445 



(Zool.), vol. 36, 1929, p. 641; Rec. Indian Mus., vol. 34, pt. 4, 1932, p. 551 (reason for chang- 

 ing name to proteclus). GISLN, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, 

 pp. 20, 25. 



Dichrometra heliaster A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 13 (listed); Crinoids 

 of the Indian Ocean, 1912, p. 149 (synonymy; Marshall Islands.). 



Dichrometra marginata A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 13 (listed). 



Antedon zebrinus (Liitken, MS.) A. H. CLARK, Vid. Medd. Naturh. Foren. K0benhavn, 1909, p. 

 117 (identity). 



Stephanometra marginala A. H. CLARK, Amer. Nat., vol. 43, 1909, p. 255 (recorded by Chadwick 

 from Suez, but record doubtful); Vid. Medd. Naturh. Foren. K0benhavn, 1909, p. 169 (in part; 

 but not specimen recorded from Singapore, which is spicala) ; Proc. U. S. Nat. Mus., vol. 40, 1911, 

 p. 5 (possibly the same as Anledon marginata recorded by Chadwick from the Red Sea), p. 9 

 (northeast coast of Africa), p. 26 (references to African specimens; localities; range; identity of 

 African specimens doubtful); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 28 (published 

 references to the specimen in the B. M.; Challenger station 208; character of proximal pin- 

 nules). GISLN, Arkiv for Zoologi, vol. 19, 1928, p. 6, No. 19 (.S. rtwnacantha; notes). 



Stephanometra indica A. H. CLARK, Proc. U. S. Nat. Mus., vol. 40, 1911, p. 26 (in part; Ceylon; 

 Maldive Islands; Bay of Bengal); Rec. Indian Museum, vol. 7, pt. 3, 1912, p. 269 (lat. 851'30" 

 N., long. 8111'52" E.; 28 fathoms); Crinoids of the Indian Ocean, 1912, p. 135 (in part; Mal- 

 dives; Tuticorin); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 29 (in part; Tuticorin; 

 Maldives); Unstalked crinoids of the Siboga-Exped., 1918, p. 97 (station 301; Mer), p. 276 

 (listed). 



Antedon militaris (Hartlaub, MS.) A. H. CLARK, Smithsonian Misc. Coll., vol. 60, No. 10, 1912, 

 p. 21 (name found with a specimen from Mortlock Island); Crinoids of the Indian Ocean, 

 1912, p. 136 (identity). 



Antedon spicata (Brit. Mus., MS). A. IT. CLARK, Crinoids of the Indian Ocean, 1912, p. 136 (identity). 



Anledon fspicata (Brit. Mus., MS). A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 29 

 (Male, Maldives; identity). 



Stephanometra protecta A. H. CLARK, Journ. Linn. Soc. (Zool.), vol. 36, 1929, p. 641; Rec. Indian 

 Mus., vol. 34, pt. 4, 1932, p. 551 (listed), p. 557 (Addu Atoll; notes). GISLN, Kungl. Fysiogr. 

 Sallsk. Lund Forh., vol. 7, No. 1, 1936, p. 4 (Macclesfield Bank); p. 6 (range). 



Stephanometra protectus A. H. CLARK, Rec. Indian Mus., vol. 34, pt. 4, 1932, p. 551 (use of name); 

 Proc. Biol. Soc. Washington, vol. 47, 1934, p. 11 (Singapore); Temminckia, vol. 1, 1936, p. 303 

 (Sissie; Batoe Ata; Obi latoe; Beo; notes); John Murray Exped. 1933-34, Sci. Reports, vol. 4, 

 No. 4, 1936, pp. 89, 103. 



Stephanometra monacanta GISLJSN, Arkiv for Zoologi, vol. 19, No. 32, 1928, p. 6, No. 19 (identity of 

 Anledon marginata). 



Stephanometra indica protectus A. H. CLARK, John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 

 1936, p. 88 (comparison with S. i. indica), p. 100. 



Lamprometra protectus BOONE, Bull. Vanderbilt Marine Mus., vol. 7, 1938, p. 110 (Bali), p. 120 

 (details of locality; references, distribution, and color notes refer to Lamprometra palmala), 

 pi. 37, facing p. 120. 



Diagnostic features. The outer cirrus segments are wholly without dorsal proc- 

 esses, being merely more or less sharply carinate in the middorsal line; P, is flexible, 

 flagellate, delicate, and slender, much smaller and weaker than P 2 ; P 2 is stout, very 

 stiff, abruptly and sharply pointed, usually straight, more rarely somewhat recurved, 

 with 9-16 (usually 11-15) segments, of which the fourth and fifth are typically abruptly 

 longer than the others; P 3 is small, flexible and weak like the pinnules following; 

 there are 13-31 (usually about 15, 20, or 30) arms 40-125 (usually 60-90) mm. long; 

 and the cirri have 16-27 (usually about 20) segments. 



Description. The centrodorsal is discoidal, with strongly sloping and swollen 

 sides or low hemispherical, with the bare, small, and usually flat dorsal pole about 



