A MONOGRAPH OF THE EXISTING CRINOIDS 453 



The specimen from Male, Maldives, has 25 arms and resembles the preceding but 

 is slightly larger. P 2 has 13-16 segments. 



The specimen from Muhlos, Maldives, has 14 arms 65 mm. long. P, is long and 

 very slender. P 2 is enlarged and stiff, but distally flagellate, with 15 segments. 

 P 3 and the following pinnules are scarcely more than half as long as P 2 . The cirri 

 are smooth with 17-19 segments, of which the shorter are slightly carinate. 



Judged from the evidence afforded by the youngest specimens, the relative pro- 

 portions of the lower pinnules in the 10-armed stage are quite the same as in the 

 adults, but P 2 is relatively more slender with more prominent articulations and is 

 somewhat recurved. 



Remarks. On the coast of Ceylon and on the adjacent coast of India this form 

 appears to intergrade, at least to some extent, with S. indica. In the 10 specimens 

 recorded by Reichensperger from Ceylon P 2 was composed of 12-18 (usually 12-14) 

 segments, and in one of those from Tuticorin and in some from Investigator station 

 175 P 2 in some cases had 16 segments. Apparently a similar increase in the number 

 of segments hi P 2 occurs in the Lesser Sunda Islands, for in the specimen from Siboga 

 station 301 P 2 sometimes has 16 segments. 



Habits. Dr. Hubert Lyman Clark said that the single specimen that he found 

 on the southwestern reef at Mer, Murray Islands, Torres Strait, was an active and 

 very graceful swimmer. 



Localities. Macclesfield Bank; 24 meters [Bell, 1894; A. H. Clark, 1912, 1913] 

 (1,B.M.). 



Albatross station 5109; China Sea, off southern Luzon; Corregidor Light bearing 

 N. 42 E., 25.8 miles distant (lat. 1403'45" N., long. 12016'30" E.); 22 meters; 

 coral bottom; January 15, 1908 [A. H. Clark, 1908, 1912] (1, U.S.N.M., 35262). 



Challenger station 208; Philippine Islands (lat. 1137' N., long. 12331' E.); 33 

 meters; blue mud; January 17, 1875 [von Graff, 1887; P. H. Carpenter, 1888; Hartlaub, 

 1891; A. H. Clark, 1907, 1908, 1909, 1912, 1913] (1, B. M.). 



Port Galera, Mindoro, Philippines; Dr. Lawrence E. Griffin, April to June, 1912 

 [H. L. Clark, 1921 (as Philippines)] (3, M. C. Z., 688, 689). 



Dr. Th. Mortensen's Pacific expedition, 1914-1916; Santa Cruz Island, Zambo- 

 anga; coral reef; February 25-28, 1914 (12). 



Albatross station 5147; Sulu archipelago, hi the vicinity of Siasi; Sulade Island 

 (E.) bearing N. 3 E., 8.4 miles distant Gat. 541'40"N., long. 12047'10 E.); 38 

 meters; coral sand and shells; February 16, 1908 [A. H. Clark, 1908, 1912] 

 (1, U.S.N.M., 35221). 



Siboga station 96; Sulu archipelago, southeastern side of the pearl bank; 15 meters; 

 lithothamnion bottom; June 27, 1899 [A. H. Clark, 1918] (1, Amsterdam Mus.). 



Mortlock Island, Carolines [Hartlaub, 1890, 1891; A. H. Clark, 1909, 1912] 

 (1,H. M.). 



Ebon, Marshall Islands; Rev. B. G. Snow, 1877 [A. H. Clark, 1908, 1912; H. L. 

 Clark, 1921] (1, M. C. Z., 290). 



Ebon, Marshall Islands; Rev. B. G. Snow, 1877 [Hartlaub, 1912]. 



Tutuila, Pago Pago, Samoa [H. L. Clark, 1921] (2, M. C. Z., 734, 753). 



Fiji; beach at Suau Point, Vauna Mbalavu; Alexander Agassiz, November 25, 

 1897 (4 + , U. S. N. M., 35232; M. C. Z., 58, 206, 288 [type of Himerometra acuta}). 



