106 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



which includes the arms borne upon its posterior IIBr axillary, has an altogether 

 abnormal groove supply. The ambulacra of its anterior arms are directly connected 

 with the peristome, as is often the case. But the ambulacrum proceeding in this 

 direction from the left posterior angle of the peristome comes to a sudden end on the 

 disk immediately after its first bifurcation, and all the ambulacral grooves of the 

 corresponding ray (the left posterior), together with those of the posterior arms on 

 the left anterior ray, are connected with the single groove trunk which curves around 

 the right side of the disk to supply the hinder arms of the right posterior ray. Car- 

 penter suggests that parasites may have been originally responsible for this condition. 



In Sarasin's specimen from Ceylon one of the axillaries bears 2 pinnules instead 

 of the usual 2 arms. 



In another Challenger specimen the anal tube is close up to the peristome a little 

 to one side of the median line instead of being central, as is usually the case. 



Carpenter noticed in a third Challenger specimen that on the outermost arm on 

 one ray the first 2 brachials are united by synarthry, whereas in the other arm borne 

 on the same IIBr axillary and in 3 similar arms of the adjacent ray these 2 brachials 

 are united by syzygy. This, however, is a more or less frequent variation rather 

 than an abnormality. 



Localities. Ceylon Pearl Fisheries Investigations station LIV; northern part of 

 the Gulf of Manaar, south of Adam's bridge; 7-73 meters; bottom varied, from sand 

 to living coral [Chadwick, 1904]. 



Ceylon; Doctor Sarasin, 1886 [Rcichensperger, 1913; H. L. Clark, 1915]. 



?India (probably Ceylon) [A. H. Clark, 1912] (1, I. M.). PL 4, fig. 7. 



King Island, Mergui Archipelago; sublittoral; Dr. John Anderson [P. H. Car- 

 penter, 1888, 1889; Bell, 1888]. 



Padaw, Mergui Archipelago [A. H. Clark, 1912] (1, U.S.N.M. 34495). PL 4, 

 fig. 6. 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 74; Sunda 

 Strait; 30 meters; stones and shells; July 29, 1922 (1). 



Siboga station 322; 1.5 miles south of Tandjong Lajar, on the southern coast of 

 Bawean Island, north of Java; 32 meters; coral; February 24, 1900 [A. H. Clark, 

 1918] (1, Amsterdam Mus.) 



Siboga station 99; anchorage off North Ubian (lat. 6 07' 30" N., long. 120 

 26' 00" E.); 16-23 meters; lithothamnion bottom; June 28-30, 1899 [A. H. Clark, 

 1918] (2, Amsterdam Mus.). 



Siboga station 89; Pulu Kaniungan ketjil; 11 meters; coral bottom; June 21, 

 1899 [A. H. Clark, 1918] (1, Amsterdam Mus.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; off Neira, Banda; 

 about 20 meters; sand; June 1, 1922 (1). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 17; 100 

 meters; sand and shells; April 12, 1922 (1); station 24; 100 meters; hard bottom; 

 April 15, 1922 (1). 



Australia [von Graff, 1884]. 



Wooded Isle, Abrolhos Islands, Western Australia [H. L. Clark, 1923]. 



Sahul Bank [A. H. Clark, 1929] (1, B. M.). 



