348 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Reometra A. H. CLARK, Proc. Biol. Soc. TVashington, vol. 47, 1934, p. 14 (new name for Oreometra, 

 preoccupied). H. L. CLARK, Echinoderm fauna of Australia, 1946, p. 54 (history). 



Diagnosis. A genus of Calometridae in which the arms are always more than 

 10 in number, with the IIBr Aeries! 4(3+4), exceptionally 3(2 + 3), and^the cirrus 

 sockets lie partly upon the centrodorsal and partly upon the radials. 



Geographical range. Known only from the coast of Queensland. 



Bathymetrical range. Known only from 46 or 47 meters. 



History. The generic name Oreometra first occurred in the combination Oreo- 

 metra mariae, a nomen nudum, in a paper published on April 23, 1912. In my mono- 

 graph of the crinoids of the Indian Ocean published on November 22, 1912, the genus 

 Oreometra was diagnosed, and the genotype was given as Oreometra mariae, new 

 species, which was described. 



Dr. F. A. Bather was so very kind as to call my attention to the fact that my 

 genus Oreometra was preoccupied by Oreometra Aurivillius, 1910 (Sjoestedt. Ergeb. 

 Schwed. Exped. Kilimandjaro, 2 [9], p. 38), a genus of African moths of the family 

 Geometridae. Accordingly in 1934 I changed the name Oreometra to Reometra. 



KEOMETKA MARIAE (A. U. Clark) 



Antedon macronema Brit. Mus., MS. 



Oreometra mariae A. H. CLARK, Zool. Anz., vol. 39, 1912, No. 11/12, p. 421 (nomen nudum; cirrus 

 sockets compared with those of Neometra sibogae); Crinoids of the Indian Ocean, 1912, p. 179 

 (description; habitat unknown); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 40 (same). 

 H. L. CLARK, Biol. Results Fishing Experiments F. I. S. Endeavour, vol. 4, pt. 1, 1916, p. 21 (com- 

 parison with 0. pericalles). >A. H. CLARK, Unstalked crinoids of the Siboga-Exped., 1918, 

 p. 136 (comparison of cirrus sockets with those of Neometra sibogae). GiSLlsN, Kungl. Fysiogr. 

 Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 22. H. L. Clark, Echinoderm fauna of Aus- 

 tralia, 1946, p. 54. 



Oreometra pericalles H. L. CLARK, Biol. Results Fishing Experiments F. I. S. Endeavour, vol. 4, 

 pt. 1, 1916, p. 20 (detailed description; locality; discussion), pi. 3, fig. 1. H. L. CLARK, Echin- 

 oderm fauna of Australia, 1946, p. 54. 



Reometra mariae H. L. CLARK, Echinoderm fauna of Australia, 1946, p. 54. 



Reometra pericalles H. L. CLARK, Echinoderm fauna of Australia, 1946, p. 54 (locality). 



Description. The centrodorsal is thick discoidal, bearing a single fairly regular 

 marginal row of cirrus sockets; the flat dorsal pole is 4 mm. in diameter. 



The cirri are XV, 44-47 (usually 46-47), from 25 to 27 mm. long. All the 

 segments are approximately equal in length, all being about twice as broad as long. 

 The ventral and lateral distal edges of the segments project rather strongly over the 

 bases of the succeeding segments. On about the fourth segment a faint very narrow 

 longitudinal ridge is visible; after the middle of the cirrus this becomes a narrow low 

 sharp carination and terminally grows into a fairly prominent rounded spine. In 

 the distal third of the cirri supplementary spines appear, one on cither side of the 

 central carination; these at first are small and are confined to the vicinity of the distal 

 edge, but on the terminal segments they become nearly as large as the median spine. 

 The spine on the antepenultimate segment is single. The opposing spine is laterally 

 broadened. The cirri are moderately stout and taper slightly in the outer half. 

 They are rounded-rhombic in cross section, suggesting the cirri of Neometra acanth- 

 aster, though the corners are less sharp. 



