768 " THETIS " SCIENTIFIC RESULTS. 



HETEROMETRA NEMATODON {Hartlaub). 



Antedon milberfi (parh), 1884, Bell, Rep. Zool. Coll. H.M.S. 

 "Alert," p. 156 {Port Molle). 



Antedon nematodon, 1890, Haitlauh, Naclir. Ges. Gottingen, 

 Mai, 1890, p. 185 (Bowen).— 1891, Nova Acta Acad., vol. 

 58, No. 1, p. 27, pi. i., fig. 9 (Bowen). 



Differential Characters. — This is easily distinguished from the 

 only other Australian species of the genus by its numerous arms 

 (thirty-eight) and cirrus segments (40-50) ; the arms are over 

 80 mm. long. 



Australian Records. — The type specimen of this species was 

 obtained many years n»o by theGodeffroy Company, and received 

 the MS. name of uematodoyi from Professor Liitken while in the 

 Godeffroy Museum. It was found at Bowen, Queensland ; a 

 second smaller specimen was obtained by the " Alert " at Port 

 Molle. 



HETEROMETRA BENGALENSIS (Hartlaub). 



Antedon bengaletisis, 1890, Hartlaub, Nachr. Ges. Gottingen, 

 Mai, 1890, p. 182 (Bay of Bengal).— 1891, Nova Acta 

 Acad., vol. 58, No. 1, p. 19, pi. i., fig. 2, pi. ii., tig. 16 {^at/ 

 of Bengal). 



Antedon ance2?s, 1904, Chad wick. Rep. Ceylon Pearl Oyster 

 Fisheries, Part II, Supplementary Report, xi., p. 157. 



Heterometra bengalensis, 1909, A. H. Clark, Proc. Biol. Soc. 

 Washington, vol. 22, p. 11. 



Dijfferential Characters. — Heterometra bengalensis is readily 

 ■distinguished from JI. nematodon, tlie only otlier Australian 

 species, by its short cirri with few (14-24) segments, the outer 

 with long spines, and by the small number (eleven or twelve) of 

 its arms. 



Specimens in the Australian Museum, Collection. — Port Curtis 

 — Three small specimens, one with twelve and two with eleven 

 arms 25 mm. to 33 mm. long; the cirri of the largest are xy, 

 14-18 (usually 15) ; except for the characters incident to imma- 

 turity, these specimens agree well with numerous others at hand 

 iiom India. A specimen in the British Museum was taken on 

 Holothuria Bank, in 15 fathoms. There are no previous Aus- 

 tralian records. 



Range. — Ceylon to the Philippine Islands, and southward to 

 Australia, reaching, on the east coast, Port Curtis. 



