22 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



ships under the command of Captain Suensson. These agreed with the specimens 

 I had collected in the same region and differed slightly, though apparently constantly, 

 from Antedon quinquecostata as described by Carpenter in the Challenger report. For 

 the species represented I proposed the name Stenometra dorsata, saying: 



I at first considered this species the same as the earlier quinquecostata of Carpenter; but it ia 

 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 com/era 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 a new species, Stenometra cristata, from the Philippines, com- 

 paring it with S. dorsata,. I noted that in S. dorsata the carination of the division series 

 and lower brachials is irregular and serrate in profile, and that S. quinquecostata resem- 

 bles S. dorsata in having short cirrus segments, though it diff ers in having a considerably 

 larger number. In my memoir on the crinoids of the Indian Ocean published in 1912 

 I listed both Stenometra dorsata and S. diadema, giving the synonymy and range of 

 each. In a paper on the comatulid fauna of eastern Asia based chiefly upon the col- 

 lections of Captain Suensson, in charge of one of the Danish cable repair ships, published 

 in 1913, I listed Stenometra dorsata as from "East Asia (probably the Korean Straits)." 

 This is a repetition of the record published in 1909. In 1915 in a paper on the bathy- 

 metrical and thermal distribution of the unstalked crinoids or comatulids occurring on 

 the coasts of China and Japan the bathymetrical range of Stenometra dorsata was given 

 as 52-170 fathoms, and the thermal range as from 11.28 to 15.89 C. Although it 

 is not so stated, S. dorsata was regarded as including diadema. In my memoir on the 

 crinoids of the Antarctic published in 1915 I pointed out that the characteristic features 

 of Anthometra adriani of the subfamily Heliometrinae, family Antedonidae, are well 

 developed in various other types, among them Stenometra dorsata and related species. 

 In my memoir on the unstalked crinoids of the Siboga expedition published in 1918 

 diadema was included in the key to the species of Stenometra, and its range was given 

 as southern Japan in 91-306 meters. Under Stenometra diadema were listed the 

 records of Thalassometra quinquecostata from southern Japan published in 1908, and 

 Stenometra dorsata was included in diadema as a synonym. 



In 1922 Prof. Torsten Gislen compared Stenometra diadema with his new species 

 S. dentata from the Bonin Islands, and in 1924 he called attention to the reversion 

 phenomenon as illustrated by S. diadema, of which he had before him some unrecorded 

 specimens that had been collected by Dr. Theodor Mortensen off southwestern Japan. 

 In 1927 he recorded and gave notes on three specimens from Dr. Mortensen's Pacific 

 Expedition station 7, and three, including two 10-armed young, from station 9. In 

 1934 he discussed the arm division of Stenometra diadema which he placed in Type 21, 

 the Stenometra diadema type. The specimens he had before him were some in the 

 Lund Museum received from Dr. Mortensen. 



In 1936 I compared Stenometra diadema with a new species, S. snelliusi, from 

 Ceram. 



