770 " THETIS " SCIENTIFIC RESULTS. 



Range, — Dichrometra is found from East Africa eastward to 

 Fiji, Tonga, the Marshall Islands, and the Philippines, and from 

 northern Australia to southern Japan, 



DICHROMETRA ARTICULATA (/. Mailer). 



Comatula (Alecto) articitlata, 184 9, J. Milller, Abhandl. k. 



preuss. Akad., 1847, p. 263 (Moluccas). 

 AnUdon articulata, 1884, Bell, Rep Zool. Coll. H.M.S. " Alert," 



p. 160 (Port 3IoUe).— 1888, P. H. Carpenter, "Challenger" 



Reports, Zool., vol. 26, p. 379. 

 Dichrometra articitlata, 1909, A. H. Clark, Proc. Biol. Soc. 



Washington, vol. 22, p. 13. 

 Differential Characters. — This species is readily distinguished 

 from the other Australian species of the genus by having Pg and 

 Pg slender and flagellate, about equal in length, and by having 

 cirri with more than thirty-five segments, of which the outer 

 bear prominent spines. 



Dichrometra articulata was originally described from the 

 Moluccas, and has since been recorded by Bell from Port Molle, 

 Queensland, where it was dredged by the "Alert" in 12 20 

 fathoms. 



DICHROMETRA REGIN^ (Bell). 



Antedon regince, 1884, Bell, Rep. Zool. Coll. H.M.S. "Alert," p. 



160, pi. xii., figs. A, Aa (Port Molle). 

 Dichrometra regince, 1909, A. H. Clark, Proc. Biol. Soc. Wash- 

 ington, vol. 22, p. 13. 



Differential Characters. — This species has cirri with about 

 thirty segments, of which the outer are strongly carinate 

 dorsally ; Pj is not greatly larger than Pg. It is not clear from 

 the original description just how it differs from D. gyges nor how" 

 either of them diff"er from D. tenera or D. protectus A redescrip- 

 tion of this species with adequate figures is much to be desired. 



Dichrometra regince is only known from a single specimen 

 which was collected by the "Alert " at Port Molle, Queensland, 

 in 12-20 fathoms. 



Remarks. — The type and only known specimen of this species, 

 which I examined in London, has the cirri xxv, 29-34 ; the 

 longest cirrus segment is about as long as broad ; the distal seg- 

 ments are about one-third broader than long ; dorsal spines are 

 developed from the thirteenth or fifteenth segment onward ; as- 

 a whole the cirii are moderately stout, but not especially long. 



There are thirty-eight arms about 100 mm. long. 



