324 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Of 16 young specimens from Singapore one has 17 arms 43 mm. long; two have 14 

 arms 55 mm. long; four have 13 arms 45 to 50 mm. long; five have 12 arms 45 to 65 

 mm. long; and four have 11 arms 50 to 60 mm. long. In some of these the distal edge 

 of the radials is bordered with a row of small regular tubercles, and the lateral and 

 proximal edges of the IBr t may be more or less scalloped. 



Localities. Gulf of Manaar; Ceylon Pearl Oyster Fisheries station LVII; outside 

 Dutch Moderagam Paar; 21-66 meters; bottom orbitolites sand, nullipores, and dead 

 corals [Chadwick, 1904; Herdman, 1906; A. H. Clark, 1912, 1918; H. L. Clark, 1915]. 



Off Trincomalee (Trinquemale) , Ceylon; Ceylon Pearl Oyster Fisheries station 

 XXIV; 2.5 to 3 miles north of Foul Point; 44-84 meters; bottom hard and rough- 

 probably rock [Chadwick, 1904; Herdman, 1906; A. H. Clark, 1912, 1918; H. L. 

 Clark, 1915]. 



Bay of Bengal [Hartlaub, 1890, 1891; A. H. Clark, 1907, 1909, 1912, 1918]. 



Singapore; Svend Gad [A. H. Clark, 1909, 1912, 1918] (21, U.S.N.M., E.1073, 

 E.1079; C.M.). 



Singapore; 13 meters; December 12, 1898 [A. H. Clark, 1929] (2, B. M.). 



New Harbour, Singapore; 15 meters; July 31, 1899 [A. H. Clark, 1934] (1, Raffles 

 Mus.). 



Geographical range. From Ceylon and the Bay of Bengal eastward to Singapore. 



Bathymetrical range. From the shoreline down to 44 (?84) meters. 



History. This species was first described by Dr. Clemens Hartlaub from a 

 specimen from the Bay of Bengal hi the Gottingen Museum in 1890. It was rede- 

 scribed and figured in 1891. Hartlaub said that it is perhaps most nearly related to 

 H. quinduplicava (anceps), which also has only 10-14 arms. He distinguished bengal- 

 ensis from quinduplicava by the following characters: In bengalensis there are only 

 22-24 cirrus segments as against 25-35 hi quinduplicava; the outer cirrus segments are 

 prominently spiny whereas in quinduplicava the outer cirrus segments have no dorsal 

 spines ; in quinduplicava more or less distinct synarthrial tubercles are present, whereas 

 there are none in bengalensis; bengalensis is further distinguished by the flattened 

 sides of the division series, and finally by the carination of the pinnule segments in 

 the proximal portion of the arms. 



In 1904 Herbert C. Chadwick, under the name of Antedon anceps (=quindupli- 

 cava), recorded specimens from Ceylon, where they had been found during the course 

 of the Ceylon Pearl Oyster Fisheries investigations under the direction of the late 

 Sir William A. Herdman In 1906 Professor Herdman published a note reidentifying 

 the specimens recorded by Chadwick as Antedon bengalensis. 



In 1907 I referred bengalensis to the new genus Himerometra and in 1908 recorded 

 a specimen from Albatross station 5146 under the name of Himerometra bengalensis. 

 This specimen in reality represents Heterometra parilis. In 1909 I referred this species 

 to the new genus Heterometra. 



In a memoir on the recent crinoids of Australia published in 1911, I recorded, 

 under the name of Heterometra bengalensis, three small specimens from Port Curtis in 

 the Australian Museum and a specimen from Holothuria bank in the British Museum. 

 These four specimens are in reality Zygometra punctata. The same records were in- 

 cluded in a memoir on the crinoids collected by the Hamburg Southwest Australian 

 Expedition, also published in 1911. 



