248 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



twice as broad as long; the seventh and following segments are more slender and are a 

 little flattened. The distal segments are about as long as, or a little longer than, 

 broad. 



PI is 4 mm. long with about 18 segments. P 2 is 3.2 mm. long with 14 segments. 

 The distal pinnules are 4.5 mm. long with 13-14 segments of which the first two and 

 the last two are short, the others from two to two and one-half tunes as long as broad. 



The disk is 4 mm. in diameter, not completely regenerated, very closely and coarsely 

 granulated, shrunken, and somewhat incised. 



The color in alcohol is white, the disk dark brown. 



Professor Gislen identified this specimen as a young individual of Crossometra 

 septentrionalis. 



Localities. Sagami Bay, Japan; Alan Owston, yacht Golden Hind [A. H. Clark, 

 1908, 1911, 1912, 1915, 1916, 1918] (1, U.S.N.M., 27502). 



Dr. Sixten Bock's Expedition to Japan 1914, station 36; Misaki, Sagami Bay, 

 Japan; directly off shore; 366 meters; July 1, 1914 [Gislen, 1922, 1924, 1934]. 



History. The first known specimen of this species was found in a collection of 

 Japanese crinoids dredged by Alan Owston, of Yokohama, in his yacht the Golden Hind 

 and subsequently purchased by Frank Springer, who presented it to the National 

 Museum. It was recorded in 1908 under the name of Charitometra distincta (P. H. 

 Carpenter). The original label had been lost, so the locality was given simply as 

 "Sagami Bay." 



The receipt of several specimens of true distincta from the Philippines showed that 

 the Japanese specimen represented a wholly different species, so in 1911 it was described 

 under the name of Pachylometra septentrionalis. In 1912 P. septentrionalis was com- 

 pared with the new species P. helius, and in my memoir on the crinoids of the Indian 

 Ocean published later in the same year it was listed and the synonymy and range were 

 given. In 1915 it was listed as a southern Japanese species with the locality. On the 

 establishment of the genus Crossometra in 1916 septentrionalis was transferred to it. 

 In my memoir on the unstalked crinoids of the Siboga Expedition septentrionalis was 

 included in the key to the species of Crossometra, the locality was given, and it was 

 compared with C. helius. 



Prof. Torsten Gislen in 1922 recorded and gave notes on a second specimen that 

 had been dredged off Misaki in 200 fathoms by Dr. Sixten Bock. He added: "Though 

 the species-name Or. distincta is older still, in conformity with A. H. Clark, I do not 

 wish to use it, partly because it is a nomen nudum, partly because the name distincta 

 was given by P. H. Carpenter to a species in the closely-related genus Pachylometra 

 (Clark did not separate this genus from Crossometra before 1918)." 



In my first reference to this species in 1908 the specific name distincta was credited 

 to Carpenter, and was not a nomen nudum. Gislen's slip is probably explained by his 

 inability to understand how I ever could have identified a specimen of septentrionalis 

 with a species as widely different as Carpenter's distincta. 



In 1924 Gislen described and figured various details of the arm structure of his 

 specimen, and in 1934 he discussed the significance of the arm branching of the species. 



