A MONOGRAPH OF THE EXISTING CRINOIDS 253 



distal ends projecting and finely spinous and the distal portion of the dorsal surface 

 finely striated. The brachials retain their triangular shape until about the last 

 quarter of the arm, when they become very obliquely quadrate and finally elongate. 



Pi is the longest pinnule, 11 mm. long with 34 segments, of which the last 12 or 

 13 bear large incurved lanceolate teeth. P2 is shorter and less stout than Pj, and P3 

 is shorter and less stout than F^. The middle and distal pinnules have the distal 

 ends everted and strongly spinous. 



The larger example from Siboga station 305 has the arms about 100 mm. long and 

 the cirri XIX, 21-25 (usually 22-23), 17 mm. long; the fourth cirrus segment is a 

 transition segment. The distal intersyzygial interval is 3 muscular artic\ilations. The 

 other specimen is similar but slightly smaller; the single complete cirrus has 20 seg- 

 ments, of which the fourth is a transition segment. 



All 3 of the Siboga specimens are considerably larger than the 2 Albatross speci- 

 mens from which the species was originally described, though otherwise resembling 

 them. 



Localities. — Albatross station 5483; between Samar and Leyte, Philippines, in 

 the vicinity of Surigao Strait; Cabugan Grande Island (N.) bearing N. 88° W., 5.7 

 miles distant (lat. 10° 27' 30" N., long. 125° 19' 15" E.); 135 meters; temperature 

 28.34° C; sand and broken shells; July 30, 1909 [A. H. Clark, 1911] (2, U.S.N.M., 

 34915). PI. 24, fig. 67. 



Albatross station 5153; Tawi Tawi group, Sulu (Jolo) Archipelago; Tocanhi Point 

 bearing S. 27° E., 2.1 miles distant (lat. 5° 18' 10" N., long. 120° 02' 55" E.); 89 

 metere; temperature 20.67° C; coral sand and shells ; February 19, 1908 [A. H. Clark, 

 1908, 1909] (3, U.S.N. M., 25513, 34914, 35950). PI. 24, fig. 66. 



Siboga stAtion 260; 2.3 miles N. 63° W. from the north point of Nuhu Jaan, Kei 

 Islands (lat. 5° 36' 30" S., long. 132° 55' 12" E.); 90 meters; sand, coral, and shells; 

 December 16 and 18, 1899 [A. H. Clark, 1918] (1, Amsterdam Mus.). 



Danish expedition to the Kei Islands; Dr. Th. Mortensen; station 24; 100 

 meters; hard bottom; April 15, 1922 (4). 



Siboga station 305; mid-channel in Solor Strait, off Kampong Menanga; 113 

 meters; stony bottom; February 8, 1900 [A. H. Clark, 1918] (2, U.S.N.M.,-E. 421; 

 Amsterdam Mus.). 



Endeavour; off Noosa Head, Queensland; 29 meters [H. L. Clark, 1916). 



History. — Among the specimens which I recorded in 1908 from Albatross station 

 5153 under the name of Comaster coppingeri, two had only 10 arms. Further study 

 showed that these in reality have nothing to do with that form, but instead represent 

 an entirely different type, which in 1909 I described in detail under the name of 

 Comissia liitkeni. 



In 1911 two more specimens were recorded from Albatross station 5483. 



Dr. Hubert Lyman Clark in 1916 recorded, as Comanthus spanoschistum, a 

 specimen from off Noosa Head, Queensland, which seems undoubtedly to be tliis 

 species. 



In 1918 I recorded this form from two Siboga stations, giving notes on the 

 specimens. 



