3<D SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



Family MARIAMETRHXE A. H. Clark 



Genus MARIAMETRA A. H. Clark 



MARIAMETRA VICARIA (Bell) 



Antedon vicaria 1894. Bell, Proc. Zool. Soc. London, 1894, p. 400 (1). 

 Antedon fvariispina 1894. Bell, T. c, p. 396 (2). 



1. Macclesfield Bank; 30-40 fathoms. — One specimen; the cirri 

 are XXIII, 29-31 (usually 29), slender, 20 mm. long; long sharp 

 dorsal spines are developed from the ninth or tenth segment onward ; 

 the longest cirrus segment (just before the .development of the 

 dorsal spines) is about twice as long as broad. 



The twenty- four arms are 60 mm. long ; the dorsolateral ornamen- 

 tation of the division series and arm bases occupies exactly the same 

 areas as in M. subcarinata, but it is much more prominent and more 

 irregular; instead of having a finely and evenly tuberculated surface 

 the sides of the rays are converted into a spongy looking mass which 

 causes the edges of the rays to appear denticulate ; the median keel 

 on the division series and brachials is much higher than in M. sub- 

 carinata. The arms and division series have a narrow dark purple 

 median line. IIIBr series when developed are always external. 



The disk is covered with small plates. 



2. Macclesfield Bank; 50 fathoms. — One specimen ; the cirri are 

 XXIII, 33-36, 23 mm. long; dorsal spines are developed from the 

 tenth segment onward ; in this specimen the cirrus segments are not 

 so long proportionately as in the preceding. One of the cirri is 

 regenerating the distal portion. 



There are between twenty-five and thirty arms 65 mm. long ; very 

 fine spines are developed in the areas of ornamentation ; these little 

 fuzzy spines cover the radials and a small part of the proximal edge 

 of the IBr x , extending thence upward interradially ; at the articula- 

 tions the ornamentation extends somewhat dorsalward, following 

 along the articular divisions, and it may even narrowly bridge the 

 division series at the synarthries, a condition not occurring so mark- 

 edly in the other specimen. 



In both individuals the division series are sharply flattened later- 

 ally, and both have the same median carination of the division series 

 and lower brachials and the same deep purple narrow median line. 



Genus DICHROMETRA A. H. Clark 

 DICHROMETRA FLAGELLATA (J. Miiller) 



i. Pulau Obin, Singapore. — Five specimens. 



