IQ BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



(absence of muscular fossae on the radial articular faces), p. 127 (compared with Glenotremiles 

 angelini), p. 235.-A. H. Clark, Treubia, vol. 14, Uvr. 2, 1933, p. 208 (placed in the Colobo- 

 metridao); Temminckia, vol. 1, 1936, p. 305. 



Diagnosis.— A genus of Colobometridae including large or very large and stout 

 species in which the arms are 53-120 (seldom less than 60) in number, 105-180 mm. 

 long; the division series are all 2 (in rare and exceptional cases occasionally 4 [3+4]); 

 the^cirri are long and stout with 41-80 (rarely less than 60) segments; and P, on the 

 outer arras of each 'postradialj series^is greatly elongated, rather slender, tapering 

 evenly to a delicate tip, composed of 20-56 segments, and several times as long as the 

 very short Pa, which resembles the pmnules foUo^ving; all the pinnules are present. 



The single species included in tiiis genus has a very characteristic appearance and 

 cannot be confused with any other crinoid. 



Geographical range.— From the Philippine and Pelew Islands southward to New 

 Caledonia and the Kei Islands, and westward to the Andaman Islands and the Mergui 

 Archipelago. 



Bathymetrical range. — From the shore line down to 73 meters. 



History. — The single species included in this genus was first mentioned by Prof. 

 Christian F. Liitken in 1879 under the generic name of Antedon. 



In my first revision of the old genus Antedon published in 1907 the new genus 

 Pontiometra was established with Antedon andersoni P. H. Carpenter as the only in- 

 cluded species. On the creation of the new family Himerometridae by me in 1908 

 Pontiometra was assigned to it, together with Himerometra, Cyllometra, and Oli- 

 gometra, and it was also referred to the Himerometridae in a revision of that family 

 published in 1909. In a paper published on May 13, 1909, 1 described a second species 

 of Pontiometra, P. insperatus, from the Philippine Islands. In a paper published on 

 September 14, 1909, I created the new family Pontiometridae, including Pontiometra 

 only. In 1911 I established a new genus, Epimetra, including a single new species 

 E. nympha, which I assigned to the Pontiometridae and compared with Pontiometra. 

 In my memoir on the crinoids of the Indian Ocean published in 1912 I included 

 Pontiometra, with P. andersoni and P. insperatus, and Epimetra, with E. nympha, in 

 the family Pontiometridae. In a revision of the family Mariametridae published in 

 1913 the family Pontiometridae was suppressed, Pontiometra being replaced in the 

 Mariametridae and Epimetra being transferred to the Colobometridae. In my report 

 on the unstalked crinoids of the Siboga expedition I similarly included Pontiometra in 

 the family Mariametridae. 



Dr. Torsten Gisl6n in 1918 discussed in detail various structural features of this 

 genus. 



In my report on the crinoids of the Buitenzorg (Java) Museum published in 1933 

 I transferred Pontiometra to the family Colobometridae. 



PONTIOMETRA ANDERSONI (P. H. Carpenter) 



Plate 1, Figure 1; Plate 2, Figures 2-5; Plate 3, Figures 6-8 



[See also vol. 1, pt 1, figs. 41, 42 (ventral view of central skeletal structures), p. 77; fig. 261 (cen- 

 trodorsal), p. 255; fig. 341 (cirrus), p. 287; fig. 432 (radial pentagon), p. 349; fig. 475 (radial 

 pentagon), p. 361; pt. 2, figs. 51, 52 (radial pentagon), p. 33; figs. 139, 140 (arm base), p. 83; 

 fig. 194 (lateral view), p. 120; fig. 255 (arm), p. 205; figs. 275-277 (arms and pinnules), p. 213; 

 figs. 724, 725 (disk), p. 346; fig. 798 (ambulacral deposits), p. 372.] 



