444 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Diagnostic features. There are about 40 arms. The cirri are composed of 15-17 

 segments, and their length is about one-sixth of the arm length. 



Description. The cirri are XXVII, 15-17, from 12 to 15 mm. long. The first 

 segment is about twice as broad as long, the second is about twice as long as the width 

 of the expanded ends and is strongly constricted centrally, and the third segment is 

 from three to four times as long as the median width, constricted centrally, though 

 not so much so as the preceding. The fourth segment is slightly over twice as long 

 as the proximal width, and those succeeding rapidly decrease in length so that the 

 seventh and following are about as long as broad. The fourth and following segments 

 bear small subterminal tubercles, and also have the distal edge everted and prominent 

 so that in lateral view they appear to bear dorsally a broad tubercle with a concave 

 crest. 



Of the IIBr series 9 are 4 (3 + 4) and 1 is 2. The IIIBr series are all 2 (1 + 2), 

 the 3 which are absent being all external. 



The 37 arms are 85 mm. long. 



The mouth is central and the anal tube is submariginal. 



Locality. Siboga station 257; in Du-roa Strait, Kei Islands; 0-52 meters; coral 

 bottom; December 11, 1899 [A. H. Clark, 1912, 1918] (1, Amsterdam Mus.). PI. 50, 

 figs. 148, 149. 



Remarks. The single specimen secured by the Siboga is the only example of 

 this species which has so far come to light. 



COMASTER BREVICIRRA (Bell) 



Plate 29, Figures 84-86 



I See also vol. l,pt. 2, figs. 25, 26 (centrodorsal and radials), p. 20; fig. 135 (division series), p. 79; fig. 

 244 (arm), p. 199; figs. 422, 423 (pinnule tip), p. 257; figs. 635, 636 (comb), p. 323; fig. 697 (disk), 

 p. 341] 



Actinomctra parvicirra (part) BELL, Pioc. Zool. Soc. London, 1894, p. 396 (Macclesfield Bank). 



Anledon brevicirra BELL, Proc. Zool. Soc. London, 1894, p. 400 (description; Macclesfield Bank, 

 20-35 fathoms). A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 38 (synonym of C. dis- 

 tincta). HARTLAUB, Mem. Mus. Comp. Zool., vol. 27, No. 4, 1912, p. 309 (in the Spinifera 

 group; history; discussion); p. 310 (insufficiently described). A. H. CLARK, Smiths. Miscell. 

 Coll., vol. 61, No. 15, 1913, p. 81 (identity). 



Comaster parvus A. H. CLARK, Proc. Biol. Soo. Washington, vol. 22, 1909, p. 144 (description; An- 

 daman Is., 53 fathoms); Proc. U. S. Nat. Mus., vol. 39, 1911, p. 533 (compared with C. die- 

 tincta); Crinoids of the Indian Ocean, 1912, p. S8 (synonymy; detailed description; Andaman 

 Is., 53 fathoms); fig. 3, p. 88; p. 315 (Andaman Is.; characters). REICHENSPERGER, Abhandl. 

 Senck. naturf. Gesellsch., vol. 35, Heft 1, 1913, p. 82 Aru (Is.); p. 87 (definite locality; characters 

 of the specimen). A. H. CLARK, Unstalked Crinoids of the Siboga Exped., 191S, p. 37 (in key; 

 range); p. 41 (references; notes; stations 240, 274, 294); pp. 274, 275 (listed). GISLEN, Kungl. 

 svenska Vetcnskap. Handl., vol. 59, No. 4, 1919, p. 10 (compared with C. lypica { Comanthus 

 parvicirra]); p. 14 (discussion); Vidensk. Medd. fra Dansk naturh. Foren., vol. 83, 1927, p. 9 

 (Mortensen's station 20; notes); figs. 5, 6, p. 15. 



Comaster distincta A. H. CLARK, Crinoids of the Indian Ocean, 1912, p. 87 (Macclesfield Bank; 

 references to Bell); Smiths. Miscell. Coll., vol. 61, No. 15, 1913, p. 13 (specimens from Mac- 

 clesfield Bank); Unstalked Crinoids of the Siboga Exped., 1918, p. 41 (references to Bell's 

 specimens). 



