28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 6l 



one arms. The largest has the arms 130 mm. and the cirri 25 mm. 

 long'. The specimen with twenty-one arms has three IIBr 2 series ; 

 two of them are on the same post-radial series, one of these being 

 followed by a single internal IIIBr 2 series. One of the specimens 

 with eighteen arms has a single internal IIIBr 2 series. In the remain- 

 ing specimens only IIBr 4 (3 + 4) series are present. 



No differences could be detected between these specimens and those 

 from the Gulf of Suez. 



Family STEPHANOMETRID^E A. H. Clark 



Genus STEPHANOMETRA A. H. Clark 



STEPHANOMETRA TUBERCULATA (P. H. Carpenter) 



Antcdon titbercalata 1888. P. H. Carpenter, " Challenger " Report, Comatu- 

 lse, p. 232 (1). — 1899. Bell, Willey's Zoological Results, vol. 2, p. 133 (2). 

 Antedon fspicata 1894. Bell, Proc. Zool. Soc. London, 1894, p. 396 (3). 



1. "Challenger" Station No. 174.- — One specimen with thirty 

 arms ; P x is slender and flexible, becoming very slender and flagel- 

 late distally ; P 2 is much enlarged, stiff and spine-like, nearly half 

 again as long as P 3 , with twelve segments ; P 3 resembles P 2 , but is 

 shorter and slightly less stout ; P 4 is very short, small, but more or 

 less stiffened ; P 5 resembles P 4 . 



2. Lifu, Loyalty Islands. — Two specimens, one with thirty arms 

 120 mm. long ; the cirri are LII, 25-28 (usually 25), 20 mm. to 30 mm. 

 long; P 2 has fifteen segments; P 3 has eleven or twelve segments. 

 The other is similar. 



3. Macclesfield Bank; 20-35 fathoms. — One specimen smaller than 

 the type, but otherwise exactly like it. 



4. Pulau Obin, Singapore. — One specimen with thirty arms. 



5. Cocos Island; Dr. Wood-Jones. — One specimen with thirty 

 arms. 



STEPHANOMETRA MARGINATA (P. H. Carpenter) 



Antedon marginata 1888. P. H. Carpenter, "Challenger" Report, Comatu- 

 lae, p. 230 (1). 



i. "Challenger" Station No. 208. — P 3 , though not especially 

 enlarged and about the length of the succeeding pinnules, is more of 

 the character of P 2 and is.somewhat stouter than the succeeding ; it 

 is flagellate distally ; P 2 curves strongly backward and is not erect, 

 as is usual in S\ monacantha. 



Possibly this species is a form of 6\ monacantha, though probably 

 it is distinct. 



