226 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Comaster lineata A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1908, p. 686 (listed); vol. 35, 1908, 

 pp. 120, 123 (arm structure); p. 124 (listed); vol. 36, 1909, p. 362 (ambulacral plating present) . 



Comaster rubiginosa A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1908, p. 686 (listed). 



Phanogenia rubiginosa A. H. CLARK, Proc. U. S. Nat. Mus., vol. 35, 1908, p. 124 (listed). 



Nemaster lineata A. H. CLARK, Vidensk. Medd. fra den naturhist. Forening i K0benhavn, 1909, 

 p. 184 (like Tropiometra this species inhabits shallow water in Brazil, deep water in the West 

 Indies); Proc. U. S. Nat. Mus., vol. 40, 1911, p. 12 (probably a West Indian species which has 

 extended its range southward); Crinoids of the Indian Ocean, 1912, p. 23 (littoral, eicept in 

 the Lesser Antilles; possibly there carried down by sinking of the land); Smiths. Miscell. 

 Coll., vol. 61, No. 15, 1913, p. 6 (references to specimens in the British Museum; Bahia, 

 7-20 fathoms; notes). 



Actinometra echinoptera var. rubiginosa (part) HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 

 4, 1912, p. 416 (Bibb, Jan. 21, 1868, Tortugas; of! Orange Key, Bahamas, Apr. 1, 1869; 

 Blake station 155); p. 418 (Tortugas; Orange Key; Montserrat; 9-17 fathoms); pp. 436- 

 437 (includes lineala; detailed account); pi. 17, figs. 4, 18. 



Actinometra echinoptera var. meridionalis-rubiginosa (part) HARTLAUB, Mem. Mus. Comp. Zool., 

 vol. 27, No. 4, 1912, p. 416 (Blake stations 127, 155; Florida); p. 418 (Montserrat, 88 fath- 

 oms); p. 438 (detailed account); pi. 17, fig. 5. 



Actinometra echinoptera var. carinata-rubiginosa HAHTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 

 4, 1912, p. 416 (Blake station 155); p. 418 (Montserrat, 88 fathoms). 



Actinometra echinoptera var. flineata HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, 

 pp. 470, 471 (Blake stations 285, 155; discussion). 



[Aclinometra ] linearis HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 437. 



Nemaster insolitus (not of A. H. Clark, 1917) H. L. CLARK, Bull. Lab. Nat. Hist., Univ. Iowa, vol. 

 7, No. 5, 1918, p. 6 (University of Iowa's Bahama expedition; no locality). 



Nemaster rubiginosa A. H. CLARK, Univ. Iowa, Studies in Nat. Hist., vol. 9, No. 5, 1921, pp. 9-11 

 (occurrence at Barbados); The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 38 

 (range). 



Nemaster, sp. A. H. CLARK, Univ. Iowa, Studies in Nat. Hist., vol. 9, No. 5, 1921, p. 7 (Brazil, 

 littoral; Rathbun's record). 



Diagnostic features. While the number of the cirri, cirrus segments, and arms 

 is the same in this species as in N. iowensis, the general habitus of the two forms 

 is very different. Nemaster rubiginosa is more slender than N. iowensis in all its 

 parts and always shows a conspicuous black stripe down the middle of the dorsal 

 surface of each arm, which in some cases may be more or less broken up into a series 

 of dashes or dots. Except for this black line the color appears to be almost uniform, 

 yellow to red or brownish red. 



The cirri are XX-XXX, 11-17 (usually not more than 14), 11 mm. long; the 

 arms are 18-34 in number (11 in Pourtales' young type specimen), from 80 to 105 

 mm. in length. 



The shorter cirri with fewer segments and the dorsal arm stripe separate this 

 species from N. grandis, while the presence of the arm stripe, the absence of the 

 dark spots on the pinnule segments, the stouter build, and the shorter brachials, 

 which have more oblique ends, separate it from N. discoidea. 



Description. The centrodorsal is discoidal, with the bare polar area rather 

 broad, from 3 to 4 mm. in diameter, and slightly concave. The cirrus sockets are 

 arranged in 2 closely crowded alternating marginal rows. 



The cirri are XX-XXX, 11-17 (usually 13-14), 10 mm. long. The first segment 

 is very short, the second is nearly or quite as long as broad, the third is somewhat 

 longer, and the fourth and fifth are the longest, half again as long as broad. The 



