A MONOGRAPH OF THE EXISTING CRINOIDS 209 



under Himerometra crassipinna, which is the species found at two of the localities 

 given. — Singapore and Pulau Ubin. 



In 1913, in a revision of the genus Himerometra, I gave in a key to the included 

 species the differential characters of H. martensi. A complete synonymy of the species 

 was given, and the range was correctly noted as Singapore, Pulau Ubin, and British 

 North Borneo. 



In the Siboga report published in 1918 martensi was included in the key to the 

 species of Himerometra, and the correct range was given. 



In 1924 Dr. Torsten Gislen discussed the articulations of this species on the basis 

 of material from Singapore. 



In 1934 I said that this species has long been known to be common at Singapore. 



HIMEROMETRA BARTSC'III A. II. Clark 



Plate 14, Figures 52, 53; Plate 16, Figures 57-59 



Himerometra bartschi A. H. Clark, Smithsonian Misc. Coll., vol. 52, 1908, p. 212 (description; Albatross 

 stations 5146; also 5147), p. 214 (comparison with H. magnipinna) ; Proc. Biol. Soc. Washington, 

 vol. 22, 1909, p. 7 (listed); Crinoids of the Indian Ocean, 1912, p. 114 (synonymy; locality); 

 Proc. U. S. Nat. Mus., vol. 46, 1913, p. 285 (in key), p. 288 (synonymy; range); Unstalked 

 crinoids of the Siboga-Exped., 1918, p. 73 (in key; range), p. 75 (references; notes; station 96), 

 p. 272 (listed). — Gislen, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, 

 pp. 41, 48. — A. H. Clark, Temminckia, vol. 1, 1936, p. 302 (Amboina, 0-2 meters); John 

 Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1936, p. 103. 



Himerometra persica A. H. Clark, Smithsonian Misc. Coll., vol. 52, 1908, p. 214 (Albatross station 

 5163; also Philippine Islands with no definite data); Proo. Biol. Soc. Washington, vol. 22, 1909, 

 p. 7 (in part; listed); Crinoids of the Indian Ocean, 1912, p. 16 (in part; records from Philip- 

 pine Islands). 



Helerometra martensi A. H. Clark, Vid. Medd. Nat. Foren. K0benhavn, 1909, pp. 164, 165 (Singa- 

 pore), p. 193 (collected at Singapore by Svend Gad); Crinoids of the Indian Ocean, 1912, p. 127 

 (Clark's record from Singapore). 



Diagnostic features. — -The proximal pinnules are slender, flagellate distally, and 

 very long, composed of 37-40 perfectly smooth segments most or all of which are 

 longer than broad, with a few of the earlier narrowly but prominently carinate; the 

 earlier segments of the following pinnules are very strongly carinate. The cirri have 

 35-43 segments, of which those in the distal half bear prominent dorsal spines. 

 The 37-61 arms are 120-150 mm. long. 



Description. — The centrodorsal is thick discoidal with a rather strongly concave 

 polar area. The cirrus sockets are arranged in two and a partial third crowded and 

 more or less alternating rows. 



The cirri are XXX, 41^43, moderately stout, rather more than one-third the 

 length of the arms, 45 mm. long. The first five segments are about twice as broad 

 as long and those following gradually increase in length to the ninth or tenth, which 

 is about as long as broad; after about the sixteenth they gradually decrease in length, 

 the terminal segments being about twice as broad as long. After the seventeenth 

 segment small but prominent dorsal spines are developed. The opposing spine is 

 centrally situated, rather slender, in height reaching to about one-half the width of 

 the penultimate segment. The terminal claw is considerably longer than the penulti- 

 mate segment, and is slender and moderately curved. 



