A MONOGRAPH OF THE EXISTING CRINOIDS 293 



The last example has 13 arms 100 mm. long; there are two IIBr 4 (3+4) series 

 and one internal IIIBr 2 series. The longest cirri have 41-43 segments and reach a 

 length of 35 mm. 



Although these six specimens are much larger and better developed than the type- 

 specimen of H. singularis, there can be no doubt but that they represent that species. 



The specimen from Singapore is in much better condition than the badly broken 

 type specimen. It has 12 arms 65 mm. long, two IIBr 4 (3+4) series being developed 

 on adjacent postradial series. The cirri are XV, 26-31, from 15 to 18 mm. long. 

 This specimen was compared directly with the type and the only difference found 

 was the slightly greater number of cirrus segments in the former. None of the cirri 

 remaining in the type, however, appear to be quite mature. 



Localities. — Investigator station 549; Mergui Archipelago, northwest of King 

 Island (lat. 12°48'00" N., long. 98°16'10" E.); 44 meters; mud, sand, and shells; 

 October 21, 1913 [A. H. Clark, 1932] (2, 1. M.). 



Investigator station 548; Mergui Archipelago, northwest of King Island (lat. 

 12°49'23" N., long. 98°23'30" E.); 42 meters; mud, sand, and shells; October 21, 

 1913 [A. H. Clark, 1932] (1, 1. M.). 



Eighty miles northwest of Penang; 73 meters; cable repair ship Patrol, Eastern 

 and Associated Telegraph Co., through Colonel Grant, I. M. S.; taken in May, 1923, 

 from a cable laid two years previously [A. H. Clark, 1929] (6, B. M.). 



Investigator; southern portion of Malacca Strait [A. H. Clark, 1909, 1912] (1, 

 I. M.). 



Singapore; Svend Gad [A. H. Clark, 1909] (1, C. M.). 



Geographical range. — From the Mergui Archipelago southward to the Malacca 

 Strait, between the Malay Peninsula and Sumatra. 



Bathymetrical range. — From the shoreline down to 73 meters. 



History. — This species was first described in 1909 from a specimen obtained by 

 the Royal Indian Marine Surveying steamer Investigator in the Malacca Strait. 

 Another specimen collected at Singapore by the Danish consul, Svend Gad, was 

 recorded in the same year. In 1912 the type specimen was redescribed and figured. 



In 1929 six more specimens were recorded from 80 miles northwest of Penang, 

 where they had been brought up by the cable repair ship Patrol, and in 1932 three 

 more specimens were recorded that had been dredged by the Investigator in the 

 Mergui Archipelago in 1913. 



HETEBOMETRA COMPTA A. H. Clark 



Plate 33, Figures 144-148 

 [See also vol. 1, pt. 2, fig. 268 (arm and pinnules), p. 207; figs. 453, 454 (pinnule tip), p. 2G1.1 



Heterometra compia A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 636 (description; Pedro 

 Shoal); Crinoids of the Indian Ocean, 1912, p. 124 (synonymy; detailed description; Pedro 

 Shoal), fig. 10, a, b, p. 126; Unstalked crinoids of the Siboga-Exped., 1918, p. 79 (in key; range); 

 Smithsonian Misc. Coll., vol. 72, No. 7, 1921, pi. 15, fig. 51 (arm) .— Gislen, Kungl. Fysiogr. 

 Sallsk. Handl., new ser., vol. 45, No. 11, 1934, pp. 22, 23, 30. 



Diagnostic features. — The brachials are distinctly wedge-shaped, with the ends 

 never quite parallel, and are not exceedingly short. The enlarged lower pinnules are 



