PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 65 



from three to three and a half times as long as broad. Pj is from 2.5 to 3.5 mm. long 

 with 8 to 10 segments. Pa is from 4 to 5.5 mm. long, with 10 to 14 segments having 

 slightly swollen articulations. P4 is from 2 to 2.5 mm. long, \vdth 7 to 9 segments. 

 Ps is 3 mm. long with about 9 segments. P, is from 1.5 to 2 mm. long, with 7 segments. 

 The distal pinnules are 5 mm. long with 15 to 16 segments of which the longest are 

 about four times as long as broad. 



The color in alcohol is brown. 



[Note by A.M.C] The two specimens in the British Museum from Billiton, 

 named Iridometra scita by Mr. Clark in 1913 have been re-e.xamined. The larger had 

 arms exceeding 60 mm. in length, the breadth at the first syzygy is 1.5 mm. The 

 longest cirri are 13 mm. long with 17 segments which are hardly at all constricted 

 in the middle; the longest segments are about twice as long as their median widths. 

 Pi has 16 or 17 segments and measures 6.5 mm. Pj with 17 or 18 segments measures 

 8 or 9 mm. P3 with 23 segments measm-es 14 mm. The smaller specimen has the 

 arms 60 mm. long and the breadth at the first syzygy is 1.1 mm. The longest cirri 

 are 11 mm. with 15 segments which are moderately constricted in the middle, this 

 effect being heightened by a band of darker color in the middle of each segment. Pj 

 has 12 or 13 segments and measures 3.5 to 4.5 mm. Pj with 14 or 15 segments measures 

 5 mm. P3 with 20 segments measures 9 to 10 mm. 



The larger of these two approaches Toxometra in the small degree of flaring of the 

 distal ends of the cirrus segments. However, the brachials are quite smooth unlike 

 those of T. paupera, also known from the East Indies. The length of the cirri in the 

 larger specimen is equal to that in the type of D. aegyptica where the arm length is only 

 40 mm. There appears to be little else besides the proportion of the cirrus to arm 

 length to distinguish between parvicirra and aegyptica. 



Localities. — Dr. Sixten Bock's station 47; Bonin Islands, east of the Channel; 

 146 meters; August 1, 1914 [Gislen, 1922]. 



Dr. SLxten Bock's station 53; Bonin Islands, 2 miles east of Higashijima; 164 

 meters; sand and broken shells; August 7, 1914 [Gisl6n, 1922]. 



Macclesfield Bank, between Luzon and Annam; 64-75 meters [A. H. Clark, 1912, 

 1913] (1, B.M.). 



Philippine Islands [A. H. Clark, 1908, 1912] (1, U.S.N.M., 25451). 



Challenger stution 208; east of Panay, Philippines (lat. 11°37' N., long. 123°31' E.); 

 33 meters; blue mud; January 17, 1875 [P. H. Carpenter, 1888] (1, B.M.). Type 

 locality. 



Albatross station 5355; North Balabac Strait; Balabac Light bearing S. 61° W., 

 16.6 miles distant (lat. 8°08'10"N., long. 117°19'15" E.); 80 meters; coral and sand; 

 January 5, 1909 [A. H. Clark, 1911] (1, U.S.N.M., 35689). 



Siboga station 99; anchorage ofiF North Ubian (lat. 6°07'30" N., long. 120°26' E.); 

 16-23 meters; June 28-30, 1899 [A. H. Clark, 1918] (1, Amsterdam M.). 



Singapore (9, U.S.N.M., E. 3202; CM.). 



Billiton, between Borneo and Sumatra [A. H. Clark, 1912, 1913] (2, B.M.). 



Albany Passage, Queensland [A. H. Clark, 1912] (1, AustraUan M.). 



Danish Expedition to the Kei Islands; station 14; 40 meters; April 10, 1922 (4, 

 C.M.;2, U.S.N.M., E. 3164). 



Danish Expedition to the Kei Islands; station 18; 40 meters; April 12, 1922 (10, 

 C.M.;9, U.S.N.M., E. 3194). 



