A. H. Cr,AR7f : THK ORINOinS OF THE INniAN OCEAN. 143 



The arms and division series bear a narrow median deep purple line. 



Habitat. — Macclesfield Bank 



Depth. — 3()-.50 fathoms. 



Remarks. — In the original description this species was referred to Carpen- 

 ter's " Spinifera group " and compared with PtUometra macronema, with which 

 it has not the remotest relation. 



Another specimen of the same species (labelled " Antedon variispiiia") taken 

 at 50 fathoms on the Macclesfield Bank has the cirri XXIIT, 3.3-36, 23 mm. long : 

 the cirrus segments are proportionately not quite so long as in the preceding (the 

 type) ; dorsal spines are developed from the tenth segment onward ; one cirrus is 

 regenerating in the distal portion. 



The ornamentation is essentially the same as in the type, but the tuberculous 

 structure is represented by fine spines on the sides of the division series ; these 

 short fine thickly-set spines cover the radials and a small part of the proximal 

 edge of the IBr, , and then extend up interradially. This lateral ornamentation 

 extends somewhat dorsalward at the articulations, running up the borders of 

 the segments, and may narrowty bridge over the division series at the synar- 

 thry. This condition is slightly more developed than in the other specimen. As 

 in the type the division series and lower brachials are sharply flattened laterally ; 

 the deep purple median line is the same in each, as is also the median carina- 

 tion. 



MARIAMETEA SUBCARINATA. 



Himerometra fiuhrarinata 1908. A. H. Clark, Proc. U. S. Nat. Mus., vol. 34, 



p. 237. 

 Mariametra subcarinata 1909. A. H. Clark, Proc. Biol. Soc. Washington, vol. 



22, p. 145 — Vidensk. Medd. fra den naturhist. Forening i Kobenhavn, 



1909, p. 171. 



Habitat. — Formosa (Taiwan) to southern Japan. 



Depth. — 22-59 fathoms. 



Genus DICHROMETRA. 



Dichrometra 1909. A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, p. 12 

 (Alecto flagellata J. Miiller, 1841). 



DICHROMETRA PROTECTUS. 



Comatula (Alecto) palmntn (part) ls49. J. Mijller, Abhandl. d. k. preuss. Akad. d. 



Wiss., 1847, p. 2(il. 

 Comatula dividua 1862. Dctjaruin and Kupi^, Hist nat. des zoophytes. Echino- 



dermes, p. 208 (nomen nudum). 

 Comatula polyactlnis 1862. Dujardin and Huri^, Hist. nat. des zoophytes. 



Echinodermcs. p. 208 (nomen nudtun). 



