A MONOGRAPH OF THE EXISTING CRENOIDS 17 



Menado Bay, northern Celebes (lat. 1°31' N., long. 124°47' E.); 457 meters; 

 Captain Christiansen, Great Northern Telegraph Company, March 12, 1912 (18, 

 U.S.N.M., E. 3215; C. M.). 



Albatross station 5G17; Moluccas; Ternate Island (S. E.) bearing S. 45° W., 7 

 miles distant (lat. 0°49'30" N., long. 127°25'30" E.); 239 meters; Nov. 27, 1909 (1, 

 U.S.N.M., 36030). 



Challenger station 192; near the Kei Islands (lat. 5°49'15" S., long. 132°14'15" 

 E.) ; 256 meters; blue mud; September 26, 1874 [P. H. Carpenter, 1888; Hartlaub, 1891, 

 1912; A. H. Clark, 1907, 1909, 1911, 1912, 1913, 1918; Gislen, 1934] (3, B. M.). 



Rotti Strait, between Timor and Rotti; 183 meters; from the Banjuwangi-Darwin 

 No. 2 cable; cable repair ship The Cable, Eastern and Associated Telegraph Co. [A. H. 

 Clark, 1929] (3, B. M.). 



Geographical range. — From the Philippines to the Kei Islands and Timor. 



Bathymetrical range. — From 183 to 457 meters. 



History. — This species was first described under the name of Antedon quinquecostata 

 by Dr. Philip Herbert Carpenter in 1888 from eight specimens and two fragments that 

 had been dredged by the Challenger at station 192. Carpenter discussed the species 

 at considerable length comparing it especially with A. (Stylometra) spinifera, and also 

 with A. (Aglaometra) valida. He dissected one of the specimens and described and 

 figured the central calcareous structures in detail. 



In 1891 Dr. Clemens Hartlaub compared Antedon quinquecostata in some detail 

 with his new species A. (Cosmiometra) conifera. In 1907 I referred quinquecostata to 

 the new genus Thalassometra, and in 1909 I described the new genus Stenometra with 

 Antedon quinquecostata as the genotype. Later in the same year in discussing the 

 new species Stenometra dorsata (=diadema) I wrote: 



At first I considered this species the same as the earlier quinquecostata of Carpenter; but it is 

 certainly true that the number of cirrus joints in Japanese specimens is considerably less than in 

 those from the Ki Islands, and, as this appears to be perfectly constant, there seems to be no doubt 

 that I was in error, and that the two are in reality perfectly distinct. This form appeared to me to 

 be covered by the name conifera of Hartlaub; but a personal examination of the unique type of that 

 species, which is in the Berlin Museum, showed me that conifera is in reality a species of Cosmiometra, 

 allied to C. crassicirra of Hawaii. 



In 1911 I described Stenometra cristata from five specimens from Albatross station 

 5275, comparing it with <S. dorsata (=diadema) from southern Japan. There can be 

 little doubt that S. cristata is based upon individuals of S. quinquecostata that have not 

 attained their full development. At the same time I noted that S. quinquecostata 

 resembles S. dorsata (=diadema) in having short cirrus segments, but it differs in 

 having a considerably larger number. Further information has proved this statement 



incorrect. 



In 1912 Hartlaub compared Antedon quinquecostata in detail with A. (Stylometra) 

 spinifera. His information regarding quinquecostata was taken from Carpenter's 

 account in the Challenger report, but he had before him many specimens of spinifera. 

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

 Stenometra quinquecostata and gave the range. 



