274 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



is always confined to the first 6 segments, reaching a maximum on the third or fourth 

 then gradually decreasing to the sixth which distally is of normal diameter, the expanded 

 segments covering the gonads progressively occupy less and less of the total length of 

 the pinnule; while in the earlier pinnules they take up most of the length, in the pinnule 

 of the fiftieth brachial they occupy barely the proximal third. The distal pinnules are 

 11 mm. long, slender, with about 20 elongated segments. 



The disk is completely plated. The brachial and pinnule ambulacra are well 

 plated. The sacculi are very small and inconspicuous. 



The color in life is yellow to yellowish brown. 



Notes. A small specimen collected with the type has the arms 80 mm. long. In 

 general it resembles the type, but the ends of the basal rays are more prominent, the 

 dorsal surface of the IBr series and lower brachials is smooth, and the brachials are all 

 proportionately longer. 



The specimen from Misaki is larger than the type, having the arms 130 mm. in 

 length. The elements of the IBr series and the first 2 brachials have a broad rounded 

 median ridge instead of the broad central tubercle seen in the typej The general 

 appearance is somewhat less rugged, though the style of ornamentation is the same. 

 In its characters it is somewhat intermediate between the type and the small specimen 

 collected at the same station. The outer ends of the radials are visible. 



Localities. Albatross station 4918; Eastern Sea, 10 to 20 miles southwest of the 

 Koshika Islands; Gwaja Shima bearing S. 38' E., 34 miles distant (lat. 3022'00" N., 

 long. 12908'30" E.); 660 meters; bottom temperature 5.94 C.; gray sand, globigerinae, 

 and broken shells; August 13, 1906 [A. H. Clark, 1907, 1908, 1909, 1912, 1915, 1916, 

 1918; Gislen, 1922, 1927, 1928] (2, U.S.N.M., 22628). 



Sagami Bay; off Misaki; Alan Owston, yacht Golden Hind, July 1902 [A. H. Clark, 

 1908, 1912, 1918] (1, U.S.N.M., 35684 [original No. 6969]). 



History. This species was described in 1907 under the name of Antedon lata from 

 a large specimen from Albatross station 4918. In my first revision of the genus Antedon 

 published later in 1907 lata was referred to the new genus Charitometra. In my report, 

 published in 1908, upon Alan Owston's collection of crinoids from southern Japan, which 

 was purchased by Dr. Frank Springer and presented by him to the National 

 Museum, I recorded another specimen of this species from off Misaki. In 1908 I 

 compared Charitometra lata with a new species, Charitometra (Pachylometra) lateralis. 

 On the establishment of the genus Glyptometra in 1909 lata was removed to it. In my 

 memoir on the crinoids of the Indian Ocean published in 1912 Glyptometra lata was 

 listed and the synonymy and range were given. In a short paper published in the same 

 year I compared Glyptometra lata with a new species, G. timorensis. In 1915 Glyptometra 

 lata was listed as a characteristic species of southern Japan and the range was given. 

 On the creation of the new genus Perissometra in 1916 lata was placed in it. In my 

 memoir on the unstalked crinoids of the Siboga Expedition published in 1918 lata was 

 included in the key to the species of Perissometra, the synonymy and localities were 

 given, and its relationships with P. (Glyptometra) timorensis were discussed. 



In 1922 Prof. Torsten Gislen compared Perissometra lata with his new species P. 

 aranea (=Parametra orion), and in 1927 he remarked that lata, with crassa and perhaps 

 other species of Perissometra, must be referred to Glyptometra. In 1928 he said that 

 lata, with patula, timorensis, flexilis, and aranea, should be assigned to Perissometra. 



