A MONOORAPH OF THE EXISTING CRINOIDS 389 



much expanded dorsally and the next 2 sHghtly so. This expansion gradually dies 

 away in the following pinnules, which increase in size, becoming stiff and rod like, 

 and are composed of long cylindrical segments after the first 2, which are laterally 

 compressed. Several of the distal pinnule segments are without the ambulacral 

 skeleton. 



The covering plates of the pinnide ambulacra according to Carpenter are sup- 

 ported on a well-developed limestone band which is not clearly divided into side plates. 

 The sacculi concealed by it are very large and closely set. 



The disk and the brachial ambulacra are very much plated; the disk is 6 mm. in 

 diameter. 



Although in the description Carpenter refers to the segments of the pinnules 

 beyond the oral as cylindrical, he later says that they are somewhat carinate. In the 

 figure which he gives of the pimiulo on the eighth brachial the segments are shown as 

 sharply prismatic. 



Notes. — The second specimen from Albatross station 5617 has 10 arms 90 mm. 

 long; the cirri are 25 mm. long with 40-43 segments. 



The specimen from Albatross station 5577 has 10 arms about 100 mm. long; the 

 cirri are XIX, 44-48, from 25 mm. to 30 mm. long. 



Of the four specimens in the British Museum from Challenger station 192 two are 

 large and two are small. In the largest the cirri are 38 mm. long, with the longest 

 segments about one-third again as long as broad or slightly longer. The IBr, are 

 extended laterally to an anterior process from the radials so that there is a veiy prom- 

 inent gap between the axillaries. 



The specimen from the Danish Expendition to the Kei Islands station 54 is small, 

 with the arms about 40 mm. long. 



Localities. — Rotti Strait, between Rotti and southwestern Timor; 183 meters; 

 cable repair ship The Cable, Eastern and Associated Telegraph Co.; from the Banju- 

 wangi-Darwin No. 2 cable [A. H. Clark, 1929] (1, B. M.). 



Challenger station 192; near the Kei Islands (lat. 5°49 14" S., long. 132°14'15" 

 E.); 256 meters; blue mud; September 26, 1874 [P. H. Carpenter, 1888; A. H. Clark, 

 1913] (4, B. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 54; 85 meters; 

 sand and coral; May 9, 1922 (1, C. M.). 



Albatross station 5617; Moluccas; Gilolo Island; Temate Island, Dodinga Bay 

 (S. E.), bearings. 45° W., 7 miles distant (lat. 0°49'40" N., long. 127°25'30" E.); 

 239 meters; November 27, 1909 (2, U. S. N. M., 35475, 36046). 



Albatross station 5577; Philippuie Islands, north of Tawi Tawi; Mt. Dromedario 

 bearings S. 9° W., 10.9 miles distant (lat. 5°20'30" N., long. 119°58'51" E.); 439 

 meters; bottom temperature 54.3° C; coarse sand; September 23, 1909 (1, U.S.N.M., 

 35474). 



Geographical range. — From southwestern Timor and the Kei Islands to the 

 Moluccas and the southern Philippines. 



Bathymetrical range. — From 85 to 439 meters; the average of the 5 records is 240 

 meters. 



Thermal range. — One record, 54.3° C. 



History. — This species was first described as Antedon discoidea by Dr. P. H. 



