A MONOGRAPH OF THE EXISTING CRINOIDS 427 



long with the cirri XXV, 99-112, 90-105 mm. long; the single IIIBr series is developed 

 externally. Another has 20 arms 100 mm. long and the cirri 95-105 mm. in length. 

 Another has 20 arms 95 mm. long and the cirri 90-95 mm. long. Of the remaining 

 specimens one (small) has 13 arms, one (small) has 16 arms, one has 18 arms, two have 

 19, and one has 20. 



This species appears to be most nearly related to P. pulcherrima from which it 

 differs in the much greater development of the cirri. 



Localities. Albatross station 5413; between Cebu and Bohol; Lauis Point Light 

 bearing N. 68 W., 10 miles distant (lat. 10 10' 35" N., long. 12403'15" E.); 77 

 meters; March 24, 1909 [A. H. Clark, 1911, 1912, 1918; Gisten, 1934] (3, U.S.N.M., 

 27495, 35785). 



Albatross station 5414; between Cebu and Bohol; Lauis Point Light bearing N. 

 67 W., 9.5 miles distant (lat. 101040" N., long. 12402'45" E.); March 24, 1909 

 [A.-H. Clark, 1911, 1912, 1918; GislSn, 1934] (9, U.S.N.M., 35852). 



History. This species was described under the name of Asterometra magnipeda 

 in 1911 from a specimen from Albatross station 5413. At the same time two additional 

 specimens were recorded from station 5413 and nine from station 5414 and notes on 

 these were given. It was referred to the genus Pteromttra in 1918. It was discussed 

 by Dr. Torsten Gisleu in 1934. 



PTEROMETRA PULCHERRIMA (A. H. Clark) 



Plate 43, Figures 218, 219 



Ptilometra pulcherrima A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 40 (nomen nudum; 

 relation to P. trichopoda); Proc. U. S. Nat. Mus., vol. 36, 1909, p. 400 (description; Albatross 

 station 5252); vol. 39, 1911, p. 547, footnote (referred to Asterometra). 



Asterometra pulcherrima A. H. CLARK, Proc. U. S. Nat. Mus., vol. 39, 1911, p. 547 (most closely 

 related to A. magnipeda}; Crinoids of the Indian Ocean, 1912, p. 193 (synonymy; new locality; 

 range) . 



Pterometra pulcherrima A. H. CLARK, Unstalked crinoids of the Siboga-Exped., 1918, p. 143 (in 

 key; range), p. 145 (synonymy; notes; station 144), p. 273 (listed), pi. 9 (colored figure), pi. 

 28, fig. 104; Treubia, vol. 14, livr. 2, 1933, p. 207 (listed), p. 214 (south of the eastern end of 

 Java; notes). GISL&N, Kungl. Fysiogr. Siillsk. Handl., new ser., vol. 45, No. 11, 1934, p. 20. 

 A. H. CLARK, Temminckia, vol. 1, 1936, p. 313 (Snellius station 60*; notes). 



Diagnostic features. The earlier cirrus segments do not have produced and 

 overlapping distal ends; the cirri are XII-XXV (usually XVI-XX), 80-120 (usually 

 90-110), from 78 to 128 (usually 85-90) mm. long, usually from three-quarters to 

 four-fifths of the arm length, rarely longer than the arms; arms 20, from 70 to 120 

 (usually 90-115) mm. long. 



Description. The centrodorsal is large, columnar, with the sides parallel, ter- 

 minated by a group of five large tubercles each radial in position which arise from an 

 otherwise flat polar area. A small circular space bounded by the ends of these tuber- 

 cles is light in color, this light color extending in interradial lines between the summits 

 of the tubercles and thence to the periphery of the polar area. The centrodorsal is 

 6 mm. in diameter at the base and 5 mm. long. The cirrus sockets are arranged in 

 10 columns of three or four each, the radial areas being separated from each other 

 by low rounded ridges, and the pairs of columns in each radial area being separated 



