A MONOGRAPH OF THE EXISTING CRINOIDS 259 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 12; 320 meters; 

 sand; April 9, 1922 (1, C. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 28; 400 meters; 

 mud; April 17, 1922 (1, C. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 45; 270 meters; 

 sand; May 1, 1922 (1, C. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 49; 245 meters; 

 sand; May 3, 1922 (1, C. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 59; 385 meters; 

 coral; May 12, 1922 (1, U.S.N.M., E. 3154). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 62; 290 meters; 

 sand and shells; May 15, 1922 (1, C.M.). 



Siboga station 297; Timor Sea (lat. 1039' S., long. 12340' E.); 520 meters; soft 

 gray mud with a brown upper layer ; January 27, 1900 [A. H. Clark, 1918] (3, U.S.N.M., 

 E. 478; Amsterdam Mus.). 



Bah' Sea (lat. 735' S., long. 11442' E.); about 200 meters; Dr. Th. Mortensen's 

 South Africa-Java Expedition 1929-30; April 10, 1929 [A. H. Clark, 1933] (1, Buiten- 

 zorg Mus.) . 



Geographical range. From northern Luzon southward to the Kei Islands and 

 Timor and westward to Java. 



Bathymetrical range. From 55 to 520 meters; there is a possibility of error in the 

 first figure; the next shallowest depth recorded is about 200 meters. 



Thermal range. One record, 11.77 C. 



History. Pachylometra investigator-is was first described in 1909 from a specimen 

 dredged by the Royal Indian Marine Survey Steamer Investigator in the Malay Archi- 

 pelago in 30 fathoms. In 1911 it was again described under the name of Pachylometra 

 luna on the basis of a specimen from Albatross station 5325. In 1912 I described 

 Pachylometra helius from a specimen from Siboga station 254. Later in the same year 

 in my memoir on the crinoids of the Indian Ocean I redescribed and figured Pachylo- 

 metra investigatoris and listed P. luna giving the original reference and the range. On 

 the establishment of the genus Crossometra in 1916 Pachylometra investigatoris was 

 selected as the genotype, and P. helius was included in it. In my memoir on the 

 unstalked crinoids of the Siboga Expedition published in 1918 Crossometra helius was 

 redescribed and figured, and three specimens of C. investigatoris were recorded from 

 station 297 with notes; Pachylometra luna was included as a synonym under C. inves- 

 tigatoris. In 1933 I recorded and gave notes on a specimen of Crossometra helius from 

 the Bali Sea. 



In 1934 Prof. Torsten Gislen recognized a special type of crinoid arm branching 

 which he called the Crossometra septentrionalis type, including in it Crossometra helius 

 and C. investigatoris. 



GLYPTOMETRA MACILENTA (A. H. Clark) 



PLATE 26, FIGURES 7^81 

 [See also vol. 1, pt. 2, figs. 533, 534, p. 287, 670, p. 335.] 



Pachylometra macilenta A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 81 (description; 

 1047'45" N., 7240'20" E.; 705 fathoms), p. 149 (compared with P. invenusta); Crinoids of the 

 Indian Ocean, 1912, p. 222 (synonymy; detailed description; locality), fig. 41, p. 223. 



