A MONOGRAPH OF THE EXISTING CRINOIDS 205 



species with those of nij' new species Cyllometra mollis, and in another paper published 

 on the same date I compared Cyllometra studeri with C. injormis, at the same time 

 mentioning a second specimen of the latter in the United States National Museum 

 from off the northern end of Samal Island, Philippines, in 23 fathoms (Albatross 

 station 5249) that appears to be typical, agreeing perfectly with Carpenter's figure. 

 In 1911 the arms of this species were compared by the author with those of a new 

 species, Decamctra modica. In a paper on the crinoids of the Berlin Museum pub- 

 lished on November 20, 1912, I recorded a young specimen that had been collected 

 at Singapore by Prof. Edouard von Martens and gave notes upon it. In my memoir 

 on the crinoids of the Indian Ocean published on November 22, 1912, I listed De- 

 cametra injormis and gave as the habitat the Philippine Islands and Singapore in 

 0-23 fathoms. In a paper on the crinoids of the British Museum published in 1913 

 I mentioned having seen the type specimen of Antedon informis in 1910 and noted 

 that it had been well figured by Carpenter. In my report on the unstalked crinoids 

 of the Sihoga expedition published in 1918 I included informis in the key to the species 

 of Decametra, and also recorded a specimen from Albatross station 5249. 



DECAMETRA MODICA A. H. Clark 



Plate 22, Figure 111; Plate 25. Figures 126, 127 



Antedon laevissima (part) Bell, in Gardiner, Fauna and geography of the Maldive and Laccadive 

 Archipelagoes, vol. 1, pt. 3, 1902, p. 224 (Fadiffolu, Maldives). 



Decametra modica A. H. Clark, Proc. U. S. Nat. Mus., vol. 40, 1911, p. 8 (southeast coast of 

 Africa), p. 32 (description; Bagamoyo); vol. 43, 1912, p. 382 (cotype from Bagaraoyo in the 

 U. S. N. M.), p. 384 (original reference), p. 400 (locality); Crinoids of the Indian Ocean, 1912, 

 p. 163 (synonymy; Bagamoyo). — Hartmeter, Mitt. Zool. Mus. Berlin, vol. 8, No. 2, 1916, 

 p. 236 (Bagamoyo; No. 6382). — A. H. Clark, Unstalked crinoids of the Siboga-Exped., 1918, 

 p. 118 (in key; range); John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 1936, p. 101 

 (range), p. 104. 



Decametra mobiusi A. H. Clark, Proc. U. S. Nat. Mus., vol. 40, 1911, p. 8 (southeast coast of 

 Africa), p. 31 (description; Mauritius); vol. 43, 1912, p. 384 (original reference), p. 400 (Mau- 

 ritius); Crinoids of the Indian Ocean, 1912, p. 40 ( = Antedon laevissima, part, BeU, 1902), 

 p. 163 (synonymy; Mauritius; Muhlos and Fadiffolu, Maldives). — Hartmeter, Mitt. Zool. 

 Mus. Berlin, vol. 8, No. 2, 1916, p. 236 (Mauritius; No. 4995).— A. H. Clark, Unstalked 

 crinoids of the Siboga-Expcd., 1918, p. 118, footnote (=D. modica); John Murray Exped. 

 1933-34, Sci. Reports, vol. 4, No. 4, 1936, p. 101 (synonym of D. modica).— H. L. Clark, 

 Echinoderm fauna of Australia, 1946, p. 52. 



Decametra tnoebiusi A. H. Clark, Rec. Indian Mus., vol. 7, pt. 3, No. 26, 1912, p. 269 (?India); 

 Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 36 (published references to specimens in the 

 B. M.; Fadiffolu and Muhlos, Maldives; notes). — A. H. Clark, John Murray Exped. 1933-34, 

 Sci. Reports, vol. 4, No. 4, 1936, p. 101 (synonym of D. modica). 



Diagnostic features. — The cirri are 7-8 mm. long with 14-20 segments that grad- 

 ually increase in length to the terminal, which are about as long as broad; on the five 

 or six preceding the penultimate there is a small very sharp median spine; Pj and Pj 

 have 11-13 segments which have slightly projecting and finely spinous distal edges, 

 Pj is longer and somewhat stouter than Pi, 4.5 mm. long; P3 is much smaller and 

 weaker, though not much shorter, than Pj ; the arms are 35-50 mm. long. 



Description. — The centrodorsal is small, discoidal, with a very small dorsal pole. 

 The cirrus sockets are arranged in two closely crowded irregular marginal rows. 



The cirri are XIV-XVI, 16-20, 8 mm. long. The first segment is short, those 



